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銅及銅合金之酸浸溶液配方

(1) 去除厚垢 ( heavy scale ) 配方 :

Sulfuric acid 55 ~ 80 oz / gal

Nitric acid 10 ~ 15 oz / gal

Temperature room

銅溶解含量最多到 3 oz / gal。

(2) 去除普通銹皮 ( moderate scales ) 配方 :

Sulfutic acid 20 ~ 30 oz / gal

Chromic acid 或 3 ~ 4 oz / gal

Sodium dichromate 45 ~ 6 oz / gal

Temperature room

銅溶解最多含量到 2 oz / gal。

(3) 去除輕微銹皮 ( light scales ) 配方 :

Sulfuric acid 19 ~ 26 oz / gal

Temperature room ~ 125 F

銅溶解量最多到 4 oz / gal。

(4) 含 0.7 % Pb以上之銅合金酸浸配方 :

Fluboric acid 15 ~ 24 oz / gal

Temperature room

銅溶解含量最多到 1.5 oz / gal。

焊接物件另加5 %過氧化氫 hydrogen peroxide。

(5) 印刷電路板 ( circuit board ) 酸浸配方有 :

Ammomium persulfate 32 vol %

Temperature room to 100 F

Nitric acid 30 ~ 36 oz / gal

Phosphoric acid 20 ~ 25 oz / gal

Temperature room to 100 F

(6) 出光 ( bright dipping ) 配方有 :

Sulfuric acid 90 ~ 110 oz / gal

Nitric acid 20 ~ 25 oz / agl

water 33 vol %

Sodium chloride 0.25 oz / gal

綠化鈉幫助出光,但過量會產生斑點 ( spotting )。

Phosphoric acid ( 85 % ) 55 vol %

Nitric acid ( 40 Be^-1 ) 20 vol %

Acetic acid ( 98 % ) 25 vol %

Temperature 130 ~ 75 F

Sodium cyanide 4 ~ 6 oz /gal

Temperature 120 ~ 150 F

也可在較低溫度下陽極處理

不銹鋼酸浸

         鹽酸會產生晶界侵蝕,殘留綠離子會引起應力腐蝕,所以不被推薦使用。不銹鋼銹皮有時不易與酸起作用,若強制除去則會過度酸浸刻蝕基材 (substrate )及產生針孔,所以必需先作脫銹 ( scale loosening ),其配方如下:

(1) 脫銹 ( scale loosening ) 配方:

Sodium hydroxide NaOH 20 ~ 25 oz / agl

Sodium carbonate ( anhydrous ) 25 oz / gal

Potassium permanganate 6 ~ 8 oz / agl

Temperature 190 F 到沸點

Sodium carbonate 20 oz / gal

Sodium hydroxide 5 oz / gal

Potassium permanganate 12 oz / gal

Temperature 190 F 到沸點

Sulfuric acid 10 vol %

Temperature 180 F

(2) 除銹酸浸 ( pickling ) 配方:

Nitric acid 30 ~ 65 oz / gal

Hydrofluoric acid 或 4 vol %

Ammonium bifluoride 6.7 oz / gal

Temperature 120 ~ 140 F

Time 不超過 30 min

Dissolved metal Fe 最多到 3 oz / gal

(3) 冷加工物件除銹酸浸配方有:

Sulfuric acid 6.25 vol %

Hydrofluoric acid 6.25 vol %

Chromic acid 8 oz / gal

Temperature 到 180 F

Ferric sulfate 9 ~ 13 oz / gal

Hydrofluoric acid 1.7 vol %

Temperature 125 ~ 135 F

Sulfuric acid 10 oz / gal

Ferric sulfate 0.25 oz / gal

Temperature 160 ~ 180 F

Nitric acid 45 ~ 70 oz / gal

Molybdic acid 0.35 ~ 0.5 oz / agl

此溶液可去除金屬雜質 ( foreign metals )

超音波洗淨

超音 波如果正確使用,對清潔工作很有幫助,它可節省時間,金錢及增加清潔度 (clearness),工作可小至螺絲而大到超過300磅重.是利用渦流(cavitation)作用及破裂(implosion) 作用去除表面污物,它對複雜工件或細孔的工件都有效.

3.10.1 超音波洗淨之影響因素

(1) 溫度:一般溫度愈高,超音波洗淨愈好,但不要越過低於沸點10^c,及不利之化學作用.

(2) 氣體:繼續法使溶液氣體易於浮出,或加熱使溶液減少,加潤濕劑(wetting agent),使氣體能迅速離開表面.

(3) 表面張力(surface tension)愈大則渦流作用密度(cavitation density)愈小.

(4) 粘度(viscosity)愈大則須較大的能量起渦流作用.

(5) 超音波能量(ultrasonic power)要適當,太大或太小都不好.

(6) 蘋律(frequency)愈大需高能量來產生相同之渦流作用,一般在21~45kHz.

(7) 工件之曝露(part exposure),工件裡面必需接觸到超音波洗淨液,通過錯誤有1.工件放置不適當形成空氣袋(gaspockets).有時需要翻動工件,2.籃子內 小工件太多,負荷過多,寧可少量多次不要多量多次,3.籃子及掛架 (baskets orfixtures for holding parts)阻礙音波.

(8) 污點(contaminants)種類:

1.可溶性污物(soluble contaminamts).

2.不溶性由可溶性粘合污物(non-soluble,held by solublebinder contaminanys)如切削屑粘附在油指物上.).

3.不溶性污物(non-soluble contaminants).

(9) 洗淨液化學成份(cleaning chemical).

(10) 設備(equipments).

3.10.2 超音波洗淨之原理及優點

原理:

超音波洗淨的作用,是以超過人類聽覺聲蘋以上的波動在液體中傳 導 ,當音波在洗淨劑中傳導,由於聲波是一種縱波,縱波推動介質的作用會使液體中壓力變化而產生無數微小真空泡,稱之為<空洞現象> (cavitation).

當氣泡受壓爆破時,會產生強大的衝擊能,可將固著在物件死角內的污垢打散,並增加洗淨劑的洗淨效果.由於超音 波蘋率高波長短,穿透力強,因此對有隱蔽細縫或複雜結構的洗淨物,可以達到完全洗淨的驚人效果.

優點:

(1)節省人力及 時間:降低人工成本,不必將物品拆開和用手刷洗,

大量節省人力及時間.

(2)完全清洗:精密零件及昂貴物品,均可完全清 洗而不傷材質.

(3)複雜物的清洗:能將複雜形狀的物品,死角及隱蔽孔洞之污垢完

全清洗,解除一般清洗法無法克服的難 題.

(4)操作簡單:免去物料流程的擔誤,減少在製品瓶頸,增加產量.

(5)可配合洗劑:可使用性質溫和之溶劑,達成更 加的洗淨效果,免除

危險性.

3.11 水洗 (Water Rinsing)

水洗需不影響產品品質.鍍 件之活性,不產生化學物於鍍件表面,乾燥後不發生變色或侵蝕作用.

(1)水洗方程式(rinsing equation)

D*Ct=F*Cr

D=帶入量(dragin)

Ct=帶入量濃度(concentration of dragin)

F= 水洗槽流量(flow throufgh the rinsingtank)

Cr=水洗濃度(concentration in the rinse)

水洗方程式表示帶入溶質的量等於水洗流出的溶質的量,如鹽進入

量(salt in)=鹽流出量(salt out).

(2)水洗效率(effectivity of the rinse)E,

E=(F*Cr)/(D*Ct)

(3)水洗濃度比值(rinsing concentration ratio)Rc,

Rc=Ct/Cr

(4) 污物極值(concentration limit)

水洗允許化學物濃度之最大值.

(5)水洗流量(flow of water throught a rining tan)

F=D*Ct/Cr

F=Rc*D

(6)水洗 體積比值(volume rining ratio)Rv,

Rv=F/D=====> E=Rv/Rc

(7)多段 式水洗(multiple rining),兩段式水洗可省水而三段式可更省水,三段以上省水則不確定,但為了回收化學物則用三段以上水洗.

(8) 水洗槽設計.

(9)水洗自動控制(automatic control),利用導電度(conductivity)控制器 (controller)或稱之水洗槽控制器(rinse tankcontroller)來維持一定水洗濃度水平Cr控制水的流量F,F=K*D

水 的流量為帶入量乘一個設定長數K值

(10)水洗中水之雜質如石灰或鎂的化合物等所產生的硬質會影響清潔力,所以需加以軟化,其方法有:

1. 用碳酸鹽或磷酸鹽再加蘇打灰使硬水中之鹽分沉澱.

2.添加無機多磷酸鹽或有機螯合劑使硬水中的鹽份不起作用.

3.利用 泡氟石或離子交換樹指軟化硬水

電解研磨

電解研磨是類似電鍍,須直流電.電解液,但工作放在陽極,利用禿出金屬部份電流集 中,及凹處極化較大的作用將工件磨平,磨光,也使表面成鈍化更耐磨蝕.電解研磨去除很少量的金屬表面,較深的刻痕記號及非金屬雜質不能去除 . 電解研磨的時間很短約2~12分鐘,除非表面起初就粗慥,或為了去除相當量的金屬如尺寸控制,毛邊去除就需較長時間.電解研磨優於機械研磨的是沒有變形, 沒有刷痕 ,沒有方向性,及能表現出真實金屬顏色.電解研磨的控制因素有溫度.電流密度,時間,電解液,攪拌等,要有好的電解液效果基材的結晶要細緻是很重要的,通 長效果不佳的原因有:1.結晶太粗大 2.不均勻結構 3.非金屬雜質 4.冷札方向性的痕跡 5.鹽類或銹污染物 6.過度酸浸 7.不當或過度冷抽加工.

拋光(buffing)的形式

(1)硬拋光(hard buffing)

(2) 色澤拋光(color buffing)

(3)接觸拋光(contact buffing)

(4)Mush buffing.

3.14.5 拋光輪(buffing wheels)

拋光輪有下列形式:

(1)Bish buff

(2)Finger buff

(3)Full-disk buff

(4)Peced buff

(5)Finnel and sisal buffs

拋光化合物(buffing componds)

(1)Tripoli compound:用於非經鐵金屬

(2)Bobbing compounds:用於鋁及銀合金

(3)Cut or cutdown compounds:非鐵金屬

(4)Cut and color compounds.

(5)Cut or color compounds.

(6)Stainless stell buffing compounds.

(7)Stell buffing compounds.

(8)Chromium buffing compounds.

(9)Rough compounds.

(10)Emery paste.

(11)Greaseless compounds.

(12)Liquid buffing compounds.

研磨及拋光自動化機器

(1)Rotary automatic machines.

(2)Straight-line machines.

(3)Reciprocating straight-line machines.

(4)Horizontal return straight-line machines.

(5)Oversal or modular rectangular type straight-line equipment.

研磨及拋光自動化(automation of polishing and buffing)

電 鍍工程中研磨及拋光佔大部份人工成本且高度塵埃,噪音及振動之惡劣

工作環境及公害,還有因個人技術差異使品質不均勻等問題其解決有賴於半

自動化或全自動化.自動化可行性之決定因素有(1)工作形狀,(2)工作材質

,(3)加工精度,(4)產量,(5)工作 尺寸大小,(6)成本

現代自動化可自動送料,下料,換位置,移位等利用程式化控制(program-

mable controller)或機器人(robots)操作.

整體研磨(Mass Finishing)

(1) 優點:

1. 成本低

2.操作簡單

3.各種金屬及非金屬均可

4.鍍件尺寸及行狀限制少

5.加工程度彈 性大

6.零件全部的表面,邊緣及角都可作用到

(2) 缺點:

1.角的研磨作用比表面大

2. 孔洞或深凹處作用較表面小

3.15.1 整體研磨的方法

(1)滾筒研磨(barrel finishing)

(2) 振動研磨(vibratory finishing)

(3)Centrifugal Disc finishing

(4)Centrifugal Barrel finishing

(5) Spindle finishing

 

 

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整體研磨的應用

(1)清潔,除銹,脫脂

(2) 去毛邊

(3)邊及角的圓滑化

(4)改變表面狀況如表面應力

(5)去除粗糙面(磨平)

(6) 光亮化(磨光)

(7)抑制腐蝕

(8)乾燥

滾桶研磨的形式

(1)Open-end, tilting

(2)Bottienecked

(3)Horizontal actagonal

(4)Triple-action,polygonal

(5)Multiple drums

(6)Multi-compartment

(7)Endtoading

(8)Submerged

滾桶研磨性質(media)與工作的比率決定因素有:

(1)工作尺寸及複雜性 (complexity)

(2)研磨性質堆積性(possibility of media lodging)

(3)工 件重疊性(possibility of parts nesting)

(4)加工品質

整體研磨設備之選擇因素

(1) 產品的要求:

        1.工件的尺寸及結構

        2.批量(batch size)

        3.工件的要求

        4.工件的控制性(variety of parts)

        5.每小時的工作量

        6.每年的產量

(2) 品質的要求:

        1.工件處理前的品質

        2.工件處理後的品質

        3. 表面加工程度

        4.邊緣狀況

        5.工件清潔度

        6.邊及表面的均勻性

        7.工件與工件間之均勻性

(3) 製程之變化

        1.與其他製程的關係

        2.自動化的需要

        3.處理時間

       4.投資金額

       5.操作及維護成本

       6.消耗物料

       7.能源

       8.水及廢液排放處理

       9.保養及修護

       10.場地空間

       11.庫存需求

       12.人力

       13.品管

       14.目前及未來需求

整體研磨劑(mass finishing compounds)

(1) 功能:

     1.促進及維持工件之清潔度

     2.控制ph值,泡沫及水的硬度

     3.潤濕表面

     4.乳化表面油汙

     5.去除銹皮及變色(tarnish)

     6.控制工件的顏色

     7.懸浮污物

     8.控制潤滑性(lubricity)

     9.防止腐蝕

     10.冷卻做用

     11.確保廢液排放符合環境保護公害之規範

(2) 使用方式:研磨劑有固體粉末及液體粉末二種,其使用方式有:

    1.批次式(batch)

    2.循環式(recirculation)

    3.流入式(flow-through)

整體研磨之介質 (finishing media)

介質的功能有:1.磨擦(abrade),2.磨光(burnish),3.分離 (

separate) 工。介質材料有下列幾種:

    1.天然介質(natural media):砂石

    2.農產物(agricultural):木屑,玉米之穗軸,胡桃殼

    3.合成介質(synthetic media):氧化鋁

    4.陶瓷介質(ceramic media)

    5.塑膠結合介質(resin-boned media)

    6.鋼介質(steel media)

(1) 介之選用考慮下列因素:

    1.毛之去除

    2.工件的表面及邊緣加工均勻性

    3.塞入孔洞或深凹處

   4.處理時間要短

(2) 介質的供應及成本:

    1.供應商之可靠性

    2.單位重量或容積的價格

    3.品質的可靠性

(3) 介質的能力及多功能性:

    1.可處理廣範的產品

    2.少磨耗性

    3.少分列性(reclassificatiopn)

    4.少裂開(break)

    5.工件間之壓制作用(cushioning action)

整體研磨之故障原因

(1)工件表面過度影響 (excessive impingement)

    1.介質使用量不足

    2.工件太大

    3.速率及頻率太大

    4.溶液水平或流量太低

    5.研磨削不足

    6.研磨削對

    7.不正確方法

    8.介質不對

(2)工件之邊緣、角及毛邊過度研磨:

    1.研磨作用太慢  

    2.介質粒子太大

    3.介質使用不對

   4.速率及頻率太大

   5.負荷過大

   6.水位不正確

(3)介質堆積在工件孔洞及深凹處:

   1.介質尺寸不對

   2.介質形狀不當

   3.介質過度磨耗折損

   4.介質分級不良

1.操作不當中斷

2. 水洗及淨化不足

3.不正確研磨劑

4.產生腐蝕

5.介質太活躍

6.另件相互影響

噴 射研磨洗淨(abrasive blast cleaning)

它是將研磨粒子以乾式或液體方式噴射在工件表面上去除污物,銹皮等作調節 (conditjoning)表面以便做進一步之處理。其主要用在:

(1)去除塵埃、銹皮、磨砂、或漆

(2)粗化表面 以便油漆及其它被覆處理

(3)去除毛邊

(4)消光處理(matte surface treatment)

(5) 去除物件餘料(flash)

(6)玻璃或陶瓷刻蝕

其它方法可分為乾式噴射洗淨(dry blast cleaning)及濕式噴射洗淨(wet blast cleaning)

乾式噴射研磨洗淨(dry blast cleaning)的研磨材料

其使用研磨材料為:

1.金屬粒子(metallic grit)

2.金屬 珠(metallic shot)

3.砂粒(sand)

4.玻璃(glass)

5.農產物 (agricultural products)如胡桃殼、稻殼、木屑

3.16.2 乾式噴射研磨洗淨機器

其所使用之機 器設備有:

(1)Cabinet mechine

(2)Continuous-flow mechines

(3)Blasting-tumbling mechines

(4)Portable Equipments

(5)Microabrasive Blasting machines

3.16.3 濕式噴射研磨洗淨(wet blast cleaning)之使用

主要用於:

(1) 去除精密工件之毛邊(burrs)

(2)消光表面處理(matle surface treatment)

(3)檢查研 磨、硬化之工件

(4)去除硬工件上之工件記號(tool marks)

(5)去除輕微銹皮

(6)電子另 件及印刷電路板去除氧化物以備焊接

(7)去除焊接銹皮(welding scale)

濕式噴射研磨洗淨研磨材料 (Abrasives)

有許多種類及尺寸的研磨材料被使用,尺寸由20-mesh到500-mesh,

研磨的材料 有:1.有機物或農產物,如胡核桃,2.無機物如砂、石英、氧化鋁等。

濕式噴射洗淨的流體介物(liquid carrier)

(1) 研磨材料

(2) 防腐蝕劑

(3) 潤濕劑

(4) 防止阻塞劑(anticlogging)

(5) 防(止沉澱劑(antisettling)

(6) 水

濕式噴射洗淨的設備

(1) Cabinet-type mechines

(2) Horizpntal-plane turntable mechines

(3) Vertical wheel-type mechines

(4) Chain or belt conveyor mechines

(5) Shutte-type cabinets with cars and rail extensions

噴射 洗淨之安全與衛生

如果有良好的預防則對人身是安全的,其危害身體的部份主要是肺,由於長期吸入粉粒會形成矽肺病,所以工做人員在起初和每 年都照x-光經專門醫師檢查肺部x光片。工做人員必需戴頭盔附有空氣供給,特殊的手套,圍巾,及鞋罩。工作室要充份通風,保持空氣乾燥,沒有污染氣體,沒 有嗅味。

前處理標準與規範

(1) ASTM A380 Descaling and Cleaning of StainlrssSteel surfaces.

(2)ASTM B183 Preparation of Low CarbonSteel for Electroplating.

(3)ASTM B242 Preparation of High-CarbonStell for Electroplating.

(4)ASTM B252 Preparation of zinc-baseddie castings for Electroplating.

(5)ASTM B253 Preparation of and Electro-plating on Aluminum alloys.

(6)ASTM B254 Preparation of and Electro-plating on Stainless Steel.

(7)ASTM B281 Preparation of Copper andCopper-Based Alloys for Electroplating.

(8)ASTM B319 Preparation of Lead andLead Alloys for Electroplating.

(9)ASTM B480 Preparation of Magnesiumand Magnesium Alloys for Electroplating.

(10)ASTM B322 Cleaning Metals beforeElectroplating.

 

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镍:银白色金属,密度8.9克/厘米3。熔点1455℃,沸点2730℃ 。化合价2和3。电离能为7.635电子伏特。质坚硬,具有磁性和良好的可塑性。有好的耐腐蚀性,在空气中不被氧化,又耐强碱。在稀酸中可缓慢溶解,释放 出氢气而产生绿色的正二价镍离子Ni2+;对氧化剂溶液包括硝酸在内,均不发生反应。镍是一个中等强度的还原剂。

镍是一种银白色金属,首 先是1751年由瑞典矿物 学家克朗斯塔特 (A.F.Cronstedt)分离出来的。由于它具有良好的机械强度和延展性,难熔耐高温,并具有很高的化学稳定性,在空气中不氧化等特 征,因此是一种十分重要的有色金属原料,被用来制造不锈钢、高镍合金钢和合 金结构钢,广泛用于飞机雷达导弹坦克舰艇宇 宙飞船原子反应 堆等各种军工制造业。在民用工业中,镍常制成结构钢、耐酸钢、耐热钢等大量用于各种机械制造业。镍还可作陶瓷颜料和防腐镀层,镍钴合金是一种永磁材料,广 泛用于电子遥控原子能工业和 超声工艺等领域,在化学工业中,镍常用作氢化催化剂

元素名称:镍
元素原子 量:58.69
元素类型:金属
原子体积:(立方厘米/摩 尔):6.59
元素在太阳中的含量:(ppm) :80
元素在海水中的含量:(ppm):太平洋表面   0.0001
地壳中含 量:(ppm):80

原子序数:28
元素符号:Ni
元素中文名称:镍
元素英文名称:Nickel

镍

镍钴合金

相对原子质量:58.69
核内质子数:28
核外电子数:28
核电核 数:28
质子质 量:4.6844E-26
质子相对质量:28.196
所属周期:4
所属族数:VIII
摩尔质量:59
氢化 物:NiH3
氧化物:NiO
最高价氧化物化学式:Ni2O3

氧化态:Main  Ni+2
Other  Ni-1, Ni0, Ni+1, Ni+3, Ni+4, Ni+6
密度:8.902
熔点:1453.0
沸点:2732.0
声 音在其中的传播速率:(m/S):4900

电离能 (kJ/ mol) 
M - M+ 736.7
M+ - M2+ 1735.0
M2+ - M3+ 3393
M3+ - M4+ 5300
M4+ - M5+ 7280
M5+ - M6+ 10400
M6+ - M7+ 12800
M7+ - M8+ 15600
M8+ - M9+ 18600
M9+ - M10+ 21660

外围电子排布:3d8 4s2
核外电子排布:2,8,16,2
晶 体结构:晶胞为面心立方晶胞,每个晶胞含有4个金属原子。

镍

晶胞参数:
aa = 352.4 pm
b = 352.4 pm
c = 352.4 pm
α = 90°
β = 90°
γ = 90°

莫氏硬度:4 
颜色和状 态:银白色金属
原 子半径:1.62
常见化合价:+2,+3

镍-发现

发现人:克朗斯塔特
发现时间和地点:1751     瑞典
元素来源:镍黄铁矿 [(Ni,Fe)9S8]

镍

镍锌磁芯

发现过程:1751年,瑞典的克郎斯塔特,用红砷镍矿表面风化后的晶粒与木炭共热, 而制得镍。
镍在地壳中含量不小,大于常见金属等,但明显比铁少得多,而且镍和铁的熔点不相上 下,因此注定它比铁发现得晚。17世纪末,欧洲人开始注意镍砒(砷)矿。当时德国用它来制造青色玻璃,采矿工人称它为 kupfernickel。“kupfer”在德文中是“铜”;“nickel”是骂人的话,大意是“骗人的小鬼”。因此这一词可以义译为“假铜”。当时 人们认为它是铜和砷的混合物

瑞 典化学家克隆斯特研究了这个矿物, 他得到了少量与铜不同的金属。他在1751年发表研究报告,认为这是一种新金属,就称它为nickel,这也就是镍的拉丁名称niccolum和符号Ni 的来源。镍在欧洲被发现 后,德国人首先把它掺入铜 中,制成所谓日耳曼银,或称德国银,也就是中国白铜

镍-来 源及用途

元素来源:矿石经煅烧成氧 化物后,用水煤气或还原而制得。
元 素用途:主要用来制造不锈钢和其他抗腐蚀合金,如镍钢、铬镍钢及各种有 色金属合金,含镍成分较高的铜镍合金,就不易腐蚀。也作加氢催化剂和用于陶瓷制品、特种化学器皿、电子线路、玻璃着绿色以及镍化合 物制备等等。具有铁磁性的金属元素,它能够高度磨光和抗腐蚀。主要用于合金(如镍钢和镍银)及用作催化剂(如拉内镍,尤指用作氢化的催化剂) ,可用来制造货币等,镀在其他金属上可以防止生

镍-同位素

最稳定的同位素
同 位素  丰度    半衰期   衰变模式   衰变能量    衰变产物
                                      MeV 
56Ni   人造     6.077天  电子捕获    2.136        56Co
58Ni   68.077 %   稳定
59Ni   人造     76,000年 电子捕获    1.072        59Co
60Ni   26.233 %   稳定
61Ni   1.14 %     稳定
62Ni   3.634 %    稳定
63Ni   人造     100.1年    β衰变     2.137        63Cu
64Ni   0.926 %    稳定

镍 -基本知识

在自然界,最主要的镍矿是 红镍矿(砷化镍)与辉砷镍矿(硫砷化镍)。古巴是世界上最著名的蕴藏镍矿的国家,在多米尼加也有大量的镍 矿。
金属镍主要用于电镀工业,镀镍的物品美观、干净、

镍

镍铬线

又不易锈蚀。极细的镍粉,在化学工业上常用作催化剂
镍 大量用于制造合金。在钢中加入镍,可以提高机械强度。如钢中含镍量从2.94%增加到了7.04%时,抗拉强度便由52.2公斤/毫米2增加到72.8公 斤/毫米3。镍钢用来制造机器承受较大压力、承受冲击和往复负荷部分的零件,如涡轮叶片、曲轴、连杆等。含镍36%、含碳0.3-0.5%的镍钢,它的膨 胀系数非常小,几乎不热胀冷缩,用来制造多种精密机械,精确量规等。含镍46%、含碳0.15%的高镍钢,叫“类铂”,因为它的膨胀系数与铂、玻璃相似, 这种高镍钢可熔焊到玻璃中。在灯泡生产上很重要,可作铂丝的代用品。一些精密的透镜框,也用这种类铂钢做,透镜不会因热胀冷缩而从框中掉下来。由 67.5%镍、16%铁、15%铬、1.5%锰组成的合金,具有很大的电阻,用来制造各种变阻器电热器
钛 镍合金具有“记忆”的本领,而且记忆力很强,经过相当长的时间,重复上千万次都准确无误。它的“记忆”本领就是记住它原来的形状,所以人们称它为“形状记 忆合金”。原来这种合金有一个特性转变温度,在转变温度之上,它具有一种组织结构,而在转变温度之下,它又有另一种组织结构。结构不同,性能也就不同。例 如:一种钛镍记忆合金,当它在转变温度之上时,很坚硬,强度大,而在这个温度以下,它却很软,容易冷加工。这样,当我们需要它记忆什么形状时,就把它做成 那种形状,这就是它的“永久记忆“形状,在转变温度以下,由于它很软,我们便可以在相当大的程度内使其任意变形。而当需要它恢复到原来形状时,只要把它加 热到转变温度以上就行了。
镍具有磁性,能被磁铁吸引。而用铝、钴与镍制成的合金,磁性更强了。这种合金受到电磁铁吸引 时,不仅自己会被吸过去,而且在它下面吊了比它重六十倍的东西,也不会掉下来。这样,可以用它来制造电磁起重机。镍的盐类大都是绿色的。氢氧化镍是棕黑色 的,氧化镍则是灰黑色的。氧化镍常用来制造铁镍碱性蓄电池。二价镍离子常用丁二酮肟来鉴定,在氨性溶液中,镍离子(Ni2+) 与丁二酮肟(Dimethylglyoxime)生成鲜红色沉淀(Ni(dmgH)2)。

 

歡 迎來到Bewise Inc.的世界,首先恭喜您來到這接受新的資訊讓產業更有競爭力,我們是提供專業刀具製 造商,應對客戶高品質的刀具需求,我們可以協助客戶滿足您對產業的不同要求,我們有能力達到非常卓越的客戶需求品質,這是現有相關技術無法比擬的,我們成 功的滿足了各行各業的要求,包括:精密HSS DIN切削刀具協 助客戶設計刀具流程DIN or JIS 鎢鋼切削刀具設計NAS986 NAS965 NAS897 NAS937orNAS907 航太切削刀具,NAS航太刀具設計超高硬度的切削刀具醫療配件刀具設計複合式再研磨機PCD地板專用企口鑽石組合刀 具粉末造粒成型機主機版專用頂級電桿PCD V-Cut捨棄式圓鋸片組粉末成型機航空機械鉸刀主機版專用頂級電汽車業刀具設計電子產業鑽石刀具木工產業鑽石刀具銑刀與切斷複合再研磨機銑刀與鑽頭複合再研磨機銑刀與螺絲攻複合再研磨機等等。我們的產品涵蓋了從民生 刀具到工業級的刀具設計;從微細刀具到大型刀具;從小型生產到大型量產;全自動整合;我們的技術可提供您連續生產的效能,我們整體的服務及卓越的技術,恭 迎您親自體驗!!

BW Bewise Inc. Willy Chen willy@tool-tool.com bw@tool-tool.com www.tool-tool.com skype:willy_chen_bw mobile:0937-618-190 Head &Administration Office No.13,Shiang Shang 2nd St., West Chiu Taichung,Taiwan 40356 http://www.tool-tool.com / FAX:+886 4 2471 4839 N.Branch 5F,No.460,Fu Shin North Rd.,Taipei,Taiwan S.Branch No.24,Sec.1,Chia Pu East Rd.,Taipao City,Chiayi Hsien,Taiwan

Welcome to BW tool world! We are an experienced tool maker specialized in cutting tools. We focus on what you need and endeavor to research the best cutter to satisfy users demand. Our customers involve wide range of industries, like mold & die, aerospace, electronic, machinery, etc. We are professional expert in cutting field. We would like to solve every problem from you. Please feel free to contact us, its our pleasure to serve for you. BW product including: cutting toolaerospace tool .HSS  DIN Cutting toolCarbide end millsCarbide cutting toolNAS Cutting toolNAS986 NAS965 NAS897 NAS937orNAS907 Cutting Tools,Carbide end milldisc milling cutter,Aerospace cutting toolhss drillФрезерыCarbide drillHigh speed steelCompound SharpenerMilling cutterINDUCTORS FOR PCDCVDD(Chemical Vapor Deposition Diamond )’PCBN (Polycrystalline Cubic Boron Nitride) Core drillTapered end millsCVD Diamond Tools Inserts’PCD Edge-Beveling Cutter(Golden FingerPCD V-CutterPCD Wood toolsPCD Cutting toolsPCD Circular Saw BladePVDD End Millsdiamond tool. INDUCTORS FOR PCD . POWDER FORMING MACHINE Single Crystal Diamond Metric end millsMiniature end millsСпециальные режущие инструменты Пустотелое сверло Pilot reamerFraisesFresas con mango PCD (Polycrystalline diamond) ‘FresePOWDER FORMING MACHINEElectronics cutterStep drillMetal cutting sawDouble margin drillGun barrelAngle milling cutterCarbide burrsCarbide tipped cutterChamfering toolIC card engraving cutterSide cutterStaple CutterPCD diamond cutter specialized in grooving floorsV-Cut PCD Circular Diamond Tipped Saw Blade with Indexable Insert PCD Diamond Tool Saw Blade with Indexable InsertNAS toolDIN or JIS toolSpecial toolMetal slitting sawsShell end millsSide and face milling cuttersSide chip clearance sawsLong end millsend mill grinderdrill grindersharpenerStub roughing end millsDovetail milling cuttersCarbide slot drillsCarbide torus cuttersAngel carbide end millsCarbide torus cuttersCarbide ball-nosed slot drillsMould cutterTool manufacturer.

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弊社の製品の供給調達機能は:

(1)生活産業~ハイテク工業までのエンドミル設計

(2)ミクロエ ンドミル~大型エンドミル供給

(3)小Lot生産~大量発注対応供給

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BW is specialized in R&D and sourcing the most advanced carbide material with high-tech coating to supply cutting / milling tool for mould & die, aero space and electronic industry. Our main products include solid carbide / HSS end mills, micro electronic drill, IC card cutter, engraving cutter, shell end mills, cutting saw, reamer, thread reamer, leading drill, involute gear cutter for spur wheel, rack and worm milling cutter, thread milling cutter, form cutters for spline shaft/roller chain sprocket, and special tool, with nano grade. Please visit our web  www.tool-tool.com  for more info.

 

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Bewise Inc. www.tool-tool.com Reference source from the internet.

 

ニッケル (Niccolum Nickel) は、原 子番号28の金 属元素である。元 素記号Ni

地殻中の存在比は約 105ppmと推定されそれほど多いわけではないが、鉄隕石中 には数%含まれ、特に62Niは核子の質量当たりの結合エネ ルギーが全原子中で最大であるなど、結 合エネルギーの点から、と共に 最も安定な元素であり、岩石惑 星を構成する元素としては比較的多量に存在し、地球中心部のに も数%含まれると推定されている。

 

銀白色の金属で鉄 族に分類される。原子量は 約58.69である。常温で安定な結 晶格子は、面 心立方構造(FCC)であり、また、よ りは弱いが強 磁性体キュ リー点は350℃であり鉄 族元素としては最も低い。

銀白色の光沢ある金属であり乾燥した空気中ではさびにくいが、微粒子状のものは空気中で自 然発火することもあり、細いニッケル線は酸素中で火花を出して燃焼する。水素よりイ オン化傾向がやや大きく、塩酸および希硫酸に徐々に溶解し緑色の水和ニッケルイオンを生成 するがその反応は極めて遅い。酸化作用を持つ希硝酸には速やかに溶解し濃硝 酸では不動 態を形成する。ア ルカリに対しては比較的強い耐食性を示す。

Ni + 2 H+(aq) → Ni2+(aq) + H2
3 Ni + 8 HNO3 → 3 Ni(NO3)2 + 2 NO + 4 H2O

微粒子状の金属粉末は水素および窒素ガスなどを吸蔵し水素付 加反応を活性化させる作用をもち、融解状態でもこれらの気体を吸収し、凝固時にその大部分を放出するため表面が巣穴になりやすい。また鉄と同様に融解状態では炭素を 6.25%まで溶解し、凝固するとグ ラファイトを析出する。

50~60℃で微粉末状のニッケルに一酸化炭素を反応させるとニッ ケルカルボニルを生成し、これを200℃に加熱する分解してニッケルを生じるためこの反応はモ ンド法と称してニッケルの精製に用いられる。

Ni + 4 CO  \rightleftarrows\ Ni(CO)4

用途

耐食性が 高いためめっ きに用いられ、ス テンレス鋼硬貨な どの原料としても使用される。日 本において現在発行されている50円硬貨100円 硬貨とニッケルの合金である白銅貨である。ア メリカ合衆国5 セント硬貨も白銅貨であるが、「ニッケル」という通称で呼ばれている。純ニッケルも硬貨の材料として用いられたことがある。これはニッケルが特殊鋼薬莢の材料である白銅の原 料として重要であるため、国家が備蓄し、平時は硬貨として流通させ、有事に際しては他の素材の硬貨や紙幣で代替して回収するためである。日本でも第二次世 界大戦直前の1933年(昭和8年)から1937年(昭和12年)にかけて、5銭と10銭のニッケル硬貨が発行されており、その名目で軍需物資であるニッ ケルを輸入した。ただし、戦後もニッケル硬貨は発行されていて、1955年(昭和30年)から1966年(昭和41年)まで発行されていた50円硬貨が ニッケル硬貨である。

磁性材

ニッケルとモ リブデンクロムを 加えた合金パー マロイと呼ぶ。優れた軟 磁性材料であることから、変圧器鉄 心磁 気ヘッドに用いられている。

耐熱材

ニッケル36%、鉄64%の合金を「イ ンバー」、ニッケル36%、鉄52%、コ バルト12%の合金を「エ リンバー」と呼ぶ。インバー合金は熱膨張率が非常に小さく、エリンバー合金は温度による弾性率の 変化が非常に小さいという特徴があり、機械式時計の発条などの精密機械に 用いられている。ニッケルベースの合金である各種のイ ンコネルは、その耐熱性からター ビン用コンプレッサ材料等に用いられる。

形状記憶合金

チタンと ニッケルの1:1の合金は最も一般的な形 状記憶合金となる。

触媒

ニッケルは不 飽和炭素結合に対する水 素付加の不 均一系触媒として工業的に用いられる。

電極材

水酸化ニッケルはニッ ケル・水素蓄電池ニッ ケル・カドミウム蓄電池等の二 次電池の正極に使われる。

水素貯蔵合金

水素を取り込む性質を利用し、水 素貯蔵合金のAB5型、Mg型。

歴史

ア クセル・クロンステット(Axel Frederik Cronstedt)が1751年に単体分離。名称はド イツ語Kupfernickel (悪魔の)に由来する。これは、ニッケル鉱石である紅 砒ニッケル鉱 (NiAs)が銅鉱石に似ていながら これから銅を遊離できなかったために、坑夫達がこう呼んだためと言われている。

日 本のニッケル鉱山と産出

日本では第 二次世界大戦中、京都府与謝郡大江山で 開発されたニッケル鉱山で日 本冶金工業が採鉱して、近くの製錬所でフェロニッケルに製錬し、さらに川崎市の同社工場でニッケル合金として軍用に提供していた。

詳 細は「大 江山鉱山」を参照

また山口県においても、山口県周南市~岩国市にかけて断続的に蛇紋岩帯があり、昭和15年~20年にかけて金峰 鉱山などで採掘が行なわれた。

この金属は、日本国内において産業上重要性が高いものの、 産出地に偏りがあり[1]供 給構造が脆弱である。日本では国内で消費する鉱物資源の多くを他国からの輸入で支えている実情か ら、万一の国際情勢の急変に対する安 全保障策として国内消費量の最低60分 を国家備蓄すると定められている。

 

歡迎來到Bewise Inc.的世界,首先恭喜您來到這接受新的資訊讓產業更有競爭力,我們是提供專業刀具製造商,應對客戶高品質的刀具需求, 我們可以協助客戶滿足您對產業的不同要求,我們有能力達到非常卓越的客戶需求品質,這是現有相關技術無法比擬的,我們成功的滿足了各行各業的要求,包括:精密HSS DIN切削刀具協助客戶設計刀具流程DIN or JIS 鎢鋼切削刀具設計NAS986 NAS965 NAS897 NAS937orNAS907 航太切削刀具,NAS航太刀具設計超高硬度的切削刀具醫療配件刀具設計複合式再研磨機PCD地板專用企口鑽石組合刀 具粉末造粒成型機主機版專用頂級電桿PCD V-Cut捨棄式圓鋸片組粉末成型機航空機械鉸刀主機版專用頂級電汽車業刀具設計電子產業鑽石刀具木工產業鑽石刀具銑刀與切斷複合再研磨機銑刀與鑽頭複合再研磨機銑刀與螺絲攻複合再研磨機等等。我們的產品涵蓋了從民生 刀具到工業級的刀具設計;從微細刀具到大型刀具;從小型生產到大型量產;全自動整合;我們的技術可提供您連續生產的效能,我們整體的服務及卓越的技術,恭 迎您親自體驗!!

BW Bewise Inc. Willy Chen willy@tool-tool.com bw@tool-tool.com www.tool-tool.com skype:willy_chen_bw mobile:0937-618-190 Head &Administration Office No.13,Shiang Shang 2nd St., West Chiu Taichung,Taiwan 40356 http://www.tool-tool.com / FAX:+886 4 2471 4839 N.Branch 5F,No.460,Fu Shin North Rd.,Taipei,Taiwan S.Branch No.24,Sec.1,Chia Pu East Rd.,Taipao City,Chiayi Hsien,Taiwan

Welcome to BW tool world! We are an experienced tool maker specialized in cutting tools. We focus on what you need and endeavor to research the best cutter to satisfy users demand. Our customers involve wide range of industries, like mold & die, aerospace, electronic, machinery, etc. We are professional expert in cutting field. We would like to solve every problem from you. Please feel free to contact us, its our pleasure to serve for you. BW product including: cutting toolaerospace tool .HSS  DIN Cutting toolCarbide end millsCarbide cutting toolNAS Cutting toolNAS986 NAS965 NAS897 NAS937orNAS907 Cutting Tools,Carbide end milldisc milling cutter,Aerospace cutting toolhss drillФрезерыCarbide drillHigh speed steelCompound SharpenerMilling cutterINDUCTORS FOR PCDCVDD(Chemical Vapor Deposition Diamond )’PCBN (Polycrystalline Cubic Boron Nitride) Core drillTapered end millsCVD Diamond Tools Inserts’PCD Edge-Beveling Cutter(Golden FingerPCD V-CutterPCD Wood toolsPCD Cutting toolsPCD Circular Saw BladePVDD End Millsdiamond tool. INDUCTORS FOR PCD . POWDER FORMING MACHINE Single Crystal Diamond Metric end millsMiniature end millsСпециальные режущие инструменты Пустотелое сверло Pilot reamerFraisesFresas con mango PCD (Polycrystalline diamond) ‘FresePOWDER FORMING MACHINEElectronics cutterStep drillMetal cutting sawDouble margin drillGun barrelAngle milling cutterCarbide burrsCarbide tipped cutterChamfering toolIC card engraving cutterSide cutterStaple CutterPCD diamond cutter specialized in grooving floorsV-Cut PCD Circular Diamond Tipped Saw Blade with Indexable Insert PCD Diamond Tool Saw Blade with Indexable InsertNAS toolDIN or JIS toolSpecial toolMetal slitting sawsShell end millsSide and face milling cuttersSide chip clearance sawsLong end millsend mill grinderdrill grindersharpenerStub roughing end millsDovetail milling cuttersCarbide slot drillsCarbide torus cuttersAngel carbide end millsCarbide torus cuttersCarbide ball-nosed slot drillsMould cutterTool manufacturer.

Bewise Inc. www.tool-tool.com

よ うこそBewise Inc.の 世界へお越し下さいませ、先ず御目出度たいのは新たな

情報を受け取って頂き、もっと各産業に競争力プラス展開。

弊 社は専門なエンドミルの製造メーカーで、客先に色んな分野のニーズ

豊富な パリエーションを満足させ、特にハイテク品質要求にサポート致します。

弊社は各領域に供給できる内容は:

(1)精密HSSエンドミルのR&D

(2)Carbide Cutting tools設計

(3)鎢鋼エンドミル設計

(4)航空エンドミル設計

(5)超高硬度エンドミル

(6)ダイヤモンドエンドミ ル

(7)医療用品エン ドミル設計

(8)自動車部品&材料加工向けエンドミル設計

弊社の製品の供給調達機能は:

(1)生活産業~ハイテク工業までのエンドミル設計

(2)ミクロエ ンドミル~大型エンドミル供給

(3)小Lot生産~大量発注対応供給

(4)オートメーション整備調達

(5)スポット対応~流れ生産対応

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Bewise Inc. talaşlı imalat sanayinde en fazla kullanılan ve üç eksende (x,y,z) talaş kaldırabilen freze takımlarından olan Parmak Freze imalatçısıdır. Çok geniş ürün yelpazesine sahip olan firmanın başlıca ürünlerini Karbür Parmak Frezeler, Kalıpçı Frezeleri, Kaba Talaş Frezeleri, Konik Alın Frezeler, Köşe Radyüs Frezeler, İki Ağızlı Kısa ve Uzun Küresel Frezeler, İç Bükey Frezeler vb. şeklinde sıralayabiliriz.

BW специализируется в научных исследованиях и разработках, и снабжаем самым высокотехнологичным карбидовым материалом для поставки режущих / фрезеровочных инструментов для почвы, воздушного пространства и электронной индустрии. В нашу основную продукцию входит твердый карбид / быстрорежущая сталь, а также двигатели, микроэлектрические дрели, IC картонорезальные машины, фрезы для гравирования, режущие пилы, фрезеры-расширители, фрезеры-расширители с резцом, дрели, резаки форм для шлицевого вала / звездочки роликовой цепи, и специальные нано инструменты. Пожалуйста, посетите сайт  www.tool-tool.com  для получения большей информации.

BW is specialized in R&D and sourcing the most advanced carbide material with high-tech coating to supply cutting / milling tool for mould & die, aero space and electronic industry. Our main products include solid carbide / HSS end mills, micro electronic drill, IC card cutter, engraving cutter, shell end mills, cutting saw, reamer, thread reamer, leading drill, involute gear cutter for spur wheel, rack and worm milling cutter, thread milling cutter, form cutters for spline shaft/roller chain sprocket, and special tool, with nano grade. Please visit our web  www.tool-tool.com  for more info.

 

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A pitted and lumpy piece of silvery metal, with the top surface cut flat

 

Nickel is a chemical element, with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. It is one of the four ferromagnetic elements that exist around room temperature, the other three being iron, cobalt and gadolinium.

The use of nickel has been traced as far back as 3500 BC, but it was first isolated and classified as a chemical element in 1751 by Axel Fredrik Cronstedt, who initially mistook its ore for a copper mineral. Its most important ore minerals are laterites, including limonite and garnierite, and pentlandite. Major production sites include Sudbury region in Canada, New Caledonia and Norilsk in Russia. The metal is corrosion-resistant, finding many uses in alloys, as a plating, in the manufacture of coins, magnets and common household utensils, as a catalyst for hydrogenation, and in a variety of other applications. Enzymes of certain life-forms contain nickel as an active center, which makes the metal an essential nutrient for those life forms.

Atomic

The electronic configuration of isolated nickel atom is counterintuitive: direct investigation

finds that the predominant electron structure of nickel is [Ar] 4s1 3d9, which is the more stable form because of relativistic effects. Whereas Hund's rule, which works well for most other elements, predicts an electron shell structure of [Ar] 3d8 4s2 (the symbol [Ar] refers to the argon-like core structure). This latter configuration is found in many chemistry textbooks and is also written as [Ar] 4s2 3d8, to emphasize that the 3d shell is the electron shell being filled by the highest-energy electrons.

Physical

Nickel is a silvery-white metal with a slight golden tinge that takes a high polish. It is one of only four elements that are magnetic at or near room temperature. Its Curie temperature is 355 °C. That is, nickel is non-magnetic above this temperature.The unit cell of nickel is a face centered cube with the lattice parameter of 0.352 nm giving an atomic radius of 0.124 nm. Nickel belongs to the transition metals and is hard and ductile.

Isotopes

Main article: Isotopes of nickel

Naturally occurring nickel is composed of 5 stable isotopes; 58Ni, 60Ni, 61Ni, 62Ni and 64Ni with 58Ni being the most abundant (68.077% natural abundance). 62Ni is one of the most stable nuclides of all the existing elements, second in stability only to 56Fe. 18 radioisotopes have been characterised with the most stable being 59Ni with a half-life of 76,000 years, 63Ni with a half-life of 100.1 years, and 56Ni with a half-life of 6.077 days. All of the remaining radioactive isotopes have half-lives that are less than 60 hours and the majority of these have half-lives that are less than 30 seconds. This element also has 1 meta state.

Nickel-56 is produced by the silicon burning process and later set free in large quantities during type Ia supernovae. Indeed, the shape of the light curve of these supernovae at intermediate to late-times corresponds to the decay via electron capture of nickel-56 to cobalt-56 and ultimately to iron-56.Nickel-59 is a long-lived cosmogenic radionuclide with a half-life of 76,000 years. 59Ni has found many applications in isotope geology. 59Ni has been used to date the terrestrial age of meteorites and to determine abundances of extraterrestrial dust in ice and sediment. Nickel-60 is the daughter product of the extinct radionuclide 60Fe, which decays with a half-life of 2.6 million years. Because 60Fe has such a long half-life, its persistence in materials in the solar system at high enough concentrations may have generated observable variations in the isotopic composition of 60Ni. Therefore, the abundance of 60Ni present in extraterrestrial material may provide insight into the origin of the solar system and its early history. Nickel-62 has the highest binding energy per nucleon of any isotope for any element (8.7946 Mev/nucleon). Isotopes heavier than 62Ni cannot be formed by nuclear fusion without losing energy. Nickel-48, discovered in 1999, is the most proton-rich heavy element isotope known. With 28 protons and 20 neutrons 48Ni is "double magic" (like 208Pb) and therefore unusually stable.The isotopes of nickel range in atomic weight from 48 u (48Ni) to 78 u (78Ni). Nickel-78's half-life was recently measured to be 110 milliseconds and is believed to be an important isotope involved in supernova nucleosynthesis of elements heavier than iron.

Chemical

See also: Category:Nickel compounds

A nickel atom with four single bonds to carbonyl (carbon triple-bonded to oxygen; bonds via the carbon) groups which are laid out tetrahedrally around it

Tetracarbonyl nickel

The most common oxidation state of nickel is +2, but compounds of Ni0, Ni+, and Ni3+ are well known, and Ni4+ has been demonstrated

Nickel(0)

Tetracarbonylnickel (Ni(CO)4), discovered by Ludwig Mond,is a volatile liquid at room temperature. On heating, the complex decomposes back to nickel and carbon monoxide:

Ni(CO)4 \overrightarrow{\leftarrow} Ni + 4 CO

This behavior is exploited in the Mond process for purifying nickel, as described above.[11] The related nickel(0) complex bis(cyclooctadiene)nickel(0) is a useful catalyst in organonickel chemistry due to the easily displaced cod ligands.

Nickel(II)

A small heap of cyan crystal particles

Nickel sulfate crystals

Nickel(II) compounds are known with all common anions, i.e. the sulfide, sulfate, carbonate, hydroxide, carboxylates, and halides. Nickel(II) sulfate is produced in large quantities by dissolving nickel metal or oxides in sulfuric acid. It exists as both a hexa- and heptahydrates.This compound is useful for electroplating nickel.

The four halogens form nickel compounds, all of which adopt octahedral geometries. Nickel(II) chloride is of particular significance, and its behavior is illustrative of the other halides. Nickel(II) chloride is produced by dissolving nickel residues in hydrochloric acid. The dichloride is usually encountered as the green hexahydrate, but it can be dehydrated to give the yellow anhydrous NiCl2. Some tetracoordinate nickel(II) complexes form both tetrahedral and square planar geometries. The tetrahedral complexes are paramagnetic and the square planar complexes are diamagnetic. This equilibrium as well as the formation of octahedral complexes contrasts with the behavior of the divalent complexes of the heavier group 10 metals, palladium(II) and platinum(II), which tend to adopt only square-planar complexes.[10]

Nickelocene is known; it has an electron count of 20, making it relatively unstable.

Nickel(III)

Nickel(III) oxide is used as the cathode in many rechargeable batteries, including nickel-cadmium, nickel-iron, nickel hydrogen, and nickel-metal hydride, and used by certain manufacturers in Li-ion batteries

Creation

The stable form of nickel is created in supernovas via the r-process.

History

Because the ores of nickel are easily mistaken for ores of silver, understanding of this metal and its use dates to relatively recent times. However, the unintentional use of nickel is ancient, and can be traced back as far as 3500 BC. Bronzes from what is now Syria had contained up to 2% nickel.Further, there are Chinese manuscripts suggesting that "white copper" (cupronickel, known as baitung) was used there between 1700 and 1400 BC. This Paktong white copper was exported to Britain as early as the 17th century, but the nickel content of this alloy was not discovered until 1822.In medieval Germany, a red mineral was found in the Erzgebirge (Ore Mountains) which resembled copper ore. However, when miners were unable to extract any copper from it they blamed a mischievous sprite of German mythology, Nickel (similar to Old Nick) for besetting the copper. They called this ore Kupfernickel from the German Kupfer for copper. This ore is now known to be nickeline or niccolite, a nickel arsenide. In 1751, Baron Axel Fredrik Cronstedt was attempting to extract copper from kupfernickel and obtained instead a white metal that he named after the spirit which had given its name to the mineral, nickel.In modern German, Kupfernickel or Kupfer-Nickel designates the alloy cupronickel.

In the United States, the term "nickel" or "nick" was originally applied to the copper-nickel Indian cent coin introduced in 1859. Later, the name designated the three-cent coin introduced in 1865, and the following year the five-cent shield nickel appropriated the designation, which has remained ever since. Coins of pure nickel were first used in 1881 in Switzerland.After its discovery the only source for nickel was the rare Kupfernickel, but from 1824 on the nickel was obtained as byproduct of cobalt blue production. The first large scale producer of nickel was Norway, which exploited nickel rich pyrrhotite from 1848 on. The introduction of nickel in steel production in 1889 increased the demand for nickel and the nickel deposits of New Caledonia, which were discovered in 1865, provided most of the world's supply between 1875 and 1915. The discovery of the large deposits in the Sudbury Basin, Canada in 1883, in Norilsk-Talnakh, Russia in 1920 and in the Merensky Reef, South Africa in 1924 made large-scale production of nickel possible.

Occurrence

See also: Ore genesis and Category:Nickel minerals

Widmanstätten pattern showing the two forms of Nickel-Iron, Kamacite and Taenite, in an octahedrite meteorite

The bulk of the nickel mined comes from two types of ore deposits. The first are laterites where the principal ore minerals are nickeliferous limonite: (Fe, Ni)O(OH) and garnierite (a hydrous nickel silicate): (Ni, Mg)3Si2O5(OH). The second are magmatic sulfide deposits where the principal ore mineral is pentlandite: (Ni, Fe)9S8.

In terms of supply, the Sudbury region of Ontario, Canada, produces about 30% of the world's supply of nickel. The Sudbury Basin deposit is theorized to have been created by a meteorite impact event early in the geologic history of Earth. Russia contains about 40% of the world's known resources at the Norilsk deposit in Siberia. The Russian mining company MMC Norilsk Nickel obtains the nickel and the associated palladium for world distribution. Other major deposits of nickel are found in New Caledonia, France, Australia, Cuba, and Indonesia. Deposits found in tropical areas typically consist of laterites which are produced by the intense weathering of ultramafic igneous rocks and the resulting secondary concentration of nickel bearing oxide and silicate minerals. Recently, a nickel deposit in western Turkey had been exploited, with this location being especially convenient for European smelters, steelmakers and factories. The one locality in the United States where nickel was commercially mined is Riddle, Oregon, where several square miles of nickel-bearing garnierite surface deposits are located. The mine closed in 1987.In 2005, Russia was the largest producer of nickel with about one-fifth world share closely followed by Canada, Australia and Indonesia, as reported by the British Geological Survey.

Based on geophysical evidence, most of the nickel on Earth is postulated to be concentrated in the Earth's core. Kamacite and taenite are naturally occurring alloys of iron and nickel. For kamacite the alloy is usually in the proportion of 90:10 to 95:5 although impurities such as cobalt or carbon may be present, while for taenite the nickel content is between 20% and 65%. Kamacite and taenite occur in nickel-iron meteorites.

Extraction and purification

Nickel output in 2005

Nickel is recovered through extractive metallurgy. Most sulfide ores have traditionally been processed using pyrometallurgical techniques to produce a matte for further refining. Recent advances in hydrometallurgy have resulted in recent nickel processing operations being developed using these processes. Most sulfide deposits have traditionally been processed by concentration through a froth flotation process followed by pyrometallurgical extraction.

Nickel is extracted from its ores by conventional roasting and reduction processes which yield a metal of greater than 75% purity. Final purification of nickel oxides is performed via the Mond process, which increases the nickel concentrate to greater than 99.99% purity. This process was patented by L. Mond and was used in South Wales in the 20th century. Nickel is reacted with carbon monoxide at around 50 °C to form volatile nickel carbonyl. Any impurities remain solid while the nickel carbonyl gas passes into a large chamber at high temperatures in which tens of thousands of nickel spheres, called pellets, are constantly stirred. The nickel carbonyl decomposes, depositing pure nickel onto the nickel spheres. Alternatively, the nickel carbonyl may be decomposed in a smaller chamber at 230 °C to create fine nickel powder. The resultant carbon monoxide is re-circulated through the process. The highly pure nickel produced by this process is known as carbonyl nickel. A second common form of refining involves the leaching of the metal matte followed by the electro-winning of the nickel from solution by plating it onto a cathode. In many stainless steel applications, 75% pure nickel can be used without further purification depending on the composition of the impurities.

Nickel sulfide ores undergo flotation (differential flotation if Ni/Fe ratio is too low) and then are smelted. After producing the nickel matte, further processing is done via the Sherritt-Gordon process. First copper is removed by adding hydrogen sulfide, leaving a concentrate of only cobalt and nickel. Solvent extraction then efficiently separates the cobalt and nickel, with the final nickel concentration greater than 99%.

Metal value

The market price of nickel surged throughout 2006 and the early months of 2007; as of April 5, 2007, the metal was trading at 52,300 USD/tonne or 1.47 USD/oz.[26] The price subsequently fell dramatically from these peaks, and as of 19 January 2009 the metal was trading at 10,880 USD/tonne.The US nickel coin contains 0.04 oz (1.25 g) of nickel, which at the April 2007 price was worth 6.5 cents, along with 3.75 grams of copper worth about 3 cents, making the metal value over 9 cents. Since the face value of a nickel is 5 cents, this made it an attractive target for melting by people wanting to sell the metals at a profit. However, the United States Mint, in anticipation of this practice, implemented new interim rules on December 14, 2006, subject to public comment for 30 days, which criminalize the melting and export of cents and nickels.Violators can be punished with a fine of up to $10,000 and/or imprisoned for a maximum of five years.

As of June 24, 2009 the melt value of a U.S. nickel is $0.0363145 which is less than the face value.

Applications

Nickel superalloy jet engine (RB199) turbine blade

Nickel is used in many industrial and consumer products, including stainless steel, magnets, coinage, rechargeable batteries, electric guitar strings and special alloys. It is also used for plating and as a green tint in glass. Nickel is pre-eminently an alloy metal, and its chief use is in the nickel steels and nickel cast irons, of which there are many varieties. It is also widely used in many other alloys, such as nickel brasses and bronzes, and alloys with copper, chromium, aluminium, lead, cobalt, silver, and gold.

Nickel plated neodymium magnet on a bracket from a hard drive.

The amounts of nickel used for various applications are 60% used for making nickel steels, 14% used in nickel-copper alloys and nickel silver, 9% used to make malleable nickel, nickel clad, Inconel and other superalloys, 6% used in plating, 3% use for nickel cast irons, 3% in heat and electric resistance alloys, such as Nichrome, 2% used for nickel brasses and bronzes with the remaining 3% of the nickel consumption in all other applications combined.[ In the laboratory, nickel is frequently used as a catalyst for hydrogenation, sometimes Raney nickel, a finely divided form of the metal alloyed with aluminium which adsorbs hydrogen gas. Nickel is often used in coins, or occasionally as a substitute for decorative silver. The American 'nickel' five-cent coin is 75% copper and 25% nickel. The Canadian nickel minted at various periods between 1922-81 was 99.9% nickel, and was magnetic.Various other nations have historically used and still use nickel in their coinage.

Nickel is also used in fire assay as a collector of platinum group elements, as it is capable of full collection of all 6 elements, in addition to partial collection of gold. This is seen through the nature of nickel as a metal, as high throughput nickel mines may run PGE recovery (primarily platinum and palladium), such as Norilsk in Russia and the Sudbury Basin in Canada.

Nickel foam or nickel mesh is used in gas diffusion electrodes for alkaline fuel cells.

Biological role

Although not recognized until the 1970s, nickel plays important roles in the biology of microorganisms and plants. In fact urease (an enzyme which assists in the hydrolysis of urea) contains nickel. The NiFe-hydrogenases contain nickel in addition to iron-sulfur clusters. Such [NiFe]-hydrogenases characteristically oxidise H2. A nickel-tetrapyrrole coenzyme, F430, is present in the methyl coenzyme M reductase which powers methanogenic archaea. One of the carbon monoxide dehydrogenase enzymes consists of an Fe-Ni-S cluster. Other nickel-containing enzymes include a class of superoxide dismutaseand a glyoxalase.

Toxicity

Exposure to nickel metal and soluble compounds should not exceed 0.05 mg/cm³ in nickel equivalents per 40-hour work week. Nickel sulfide fume and dust is believed to be carcinogenic, and various other nickel compounds may be as well.[39][40] Nickel carbonyl, [Ni(CO)4], is an extremely toxic gas. The toxicity of metal carbonyls is a function of both the toxicity of the metal as well as the carbonyl's ability to give off highly toxic carbon monoxide gas, and this one is no exception. It is explosive in air.[41][42] Sensitized individuals may show an allergy to nickel affecting their skin, also known as dermatitis. Sensitivity to nickel may also be present in patients with pompholyx. Nickel is an important cause of contact allergy, partly due to its use in jewellery intended for pierced ears.[43] Nickel allergies affecting pierced ears are often marked by itchy, red skin. Many earrings are now made nickel-free due to this problem. The amount of nickel which is allowed in products which come into contact with human skin is regulated by the European Union. In 2002 researchers found amounts of nickel being emitted by 1 and 2 Euro coins far in excess of those standards. This is believed to be due to a galvanic reaction.It was voted Allergen of the Year in 2008 by the American Contact Dermatitis Society.

 

歡迎來到Bewise Inc.的世界,首先恭喜您來到這接受新的資訊讓產業更有競爭力, 我們是提供專業刀具製造商,應對客戶高品質的刀具需求,我們可以協助客戶滿足您對產業的不同要求,我們有能力達到非常卓越的客戶需求品質,這是現有相關技 術無法比擬的,我們成功的滿足了各行各業的要求,包括:精密HSS DIN切削刀具協助客戶設計刀具流程DIN or JIS 鎢鋼切削刀具設計NAS986 NAS965 NAS897 NAS937orNAS907 航太切削刀具,NAS航太刀具設計超高硬度的切削刀具醫療配件刀具設計複合式再研磨機PCD地板專用企口鑽石組合刀 具粉末造粒成型機主機版專用頂級電桿PCD V-Cut捨棄式圓鋸片組粉末成型機航空機械鉸刀主機版專用頂級電汽車業刀具設計電子產業鑽石刀具木工產業鑽石刀具銑刀與切斷複合再研磨機銑刀與鑽頭複合再研磨機銑刀與螺絲攻複合再研磨機等等。我們的產品涵蓋了從民生 刀具到工業級的刀具設計;從微細刀具到大型刀具;從小型生產到大型量產;全自動整合;我們的技術可提供您連續生產的效能,我們整體的服務及卓越的技術,恭 迎您親自體驗!!

BW Bewise Inc. Willy Chen willy@tool-tool.com bw@tool-tool.com www.tool-tool.com skype:willy_chen_bw mobile:0937-618-190 Head &Administration Office No.13,Shiang Shang 2nd St., West Chiu Taichung,Taiwan 40356 http://www.tool-tool.com / FAX:+886 4 2471 4839 N.Branch 5F,No.460,Fu Shin North Rd.,Taipei,Taiwan S.Branch No.24,Sec.1,Chia Pu East Rd.,Taipao City,Chiayi Hsien,Taiwan

Welcome to BW tool world! We are an experienced tool maker specialized in cutting tools. We focus on what you need and endeavor to research the best cutter to satisfy users demand. Our customers involve wide range of industries, like mold & die, aerospace, electronic, machinery, etc. We are professional expert in cutting field. We would like to solve every problem from you. Please feel free to contact us, its our pleasure to serve for you. BW product including: cutting toolaerospace tool .HSS  DIN Cutting toolCarbide end millsCarbide cutting toolNAS Cutting toolNAS986 NAS965 NAS897 NAS937orNAS907 Cutting Tools,Carbide end milldisc milling cutter,Aerospace cutting toolhss drillФрезерыCarbide drillHigh speed steelCompound SharpenerMilling cutterINDUCTORS FOR PCDCVDD(Chemical Vapor Deposition Diamond )’PCBN (Polycrystalline Cubic Boron Nitride) Core drillTapered end millsCVD Diamond Tools Inserts’PCD Edge-Beveling Cutter(Golden FingerPCD V-CutterPCD Wood toolsPCD Cutting toolsPCD Circular Saw BladePVDD End Millsdiamond tool. INDUCTORS FOR PCD . POWDER FORMING MACHINE Single Crystal Diamond Metric end millsMiniature end millsСпециальные режущие инструменты Пустотелое сверло Pilot reamerFraisesFresas con mango PCD (Polycrystalline diamond) ‘FresePOWDER FORMING MACHINEElectronics cutterStep drillMetal cutting sawDouble margin drillGun barrelAngle milling cutterCarbide burrsCarbide tipped cutterChamfering toolIC card engraving cutterSide cutterStaple CutterPCD diamond cutter specialized in grooving floorsV-Cut PCD Circular Diamond Tipped Saw Blade with Indexable Insert PCD Diamond Tool Saw Blade with Indexable InsertNAS toolDIN or JIS toolSpecial toolMetal slitting sawsShell end millsSide and face milling cuttersSide chip clearance sawsLong end millsend mill grinderdrill grindersharpenerStub roughing end millsDovetail milling cuttersCarbide slot drillsCarbide torus cuttersAngel carbide end millsCarbide torus cuttersCarbide ball-nosed slot drillsMould cutterTool manufacturer.

Bewise Inc. www.tool-tool.com

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豊富な パリエーションを満足させ、特にハイテク品質要求にサポート致します。

弊社は各領域に供給できる内容は:

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(4)航空エンドミル設計

(5)超高硬度エンドミル

(6)ダイヤモンドエンドミ ル

(7)医療用品エン ドミル設計

(8)自動車部品&材料加工向けエンドミル設計

弊社の製品の供給調達機能は:

(1)生活産業~ハイテク工業までのエンドミル設計

(2)ミクロエ ンドミル~大型エンドミル供給

(3)小Lot生産~大量発注対応供給

(4)オートメーション整備調達

(5)スポット対応~流れ生産対応

弊社の 全般供給体制及び技術自慢の総合専門製造メーカーに貴方のご体験を御待ちしております。

Bewise Inc. talaşlı imalat sanayinde en fazla kullanılan ve üç eksende (x,y,z) talaş kaldırabilen freze takımlarından olan Parmak Freze imalatçısıdır. Çok geniş ürün yelpazesine sahip olan firmanın başlıca ürünlerini Karbür Parmak Frezeler, Kalıpçı Frezeleri, Kaba Talaş Frezeleri, Konik Alın Frezeler, Köşe Radyüs Frezeler, İki Ağızlı Kısa ve Uzun Küresel Frezeler, İç Bükey Frezeler vb. şeklinde sıralayabiliriz.

BW специализируется в научных исследованиях и разработках, и снабжаем самым высокотехнологичным карбидовым материалом для поставки режущих / фрезеровочных инструментов для почвы, воздушного пространства и электронной индустрии. В нашу основную продукцию входит твердый карбид / быстрорежущая сталь, а также двигатели, микроэлектрические дрели, IC картонорезальные машины, фрезы для гравирования, режущие пилы, фрезеры-расширители, фрезеры-расширители с резцом, дрели, резаки форм для шлицевого вала / звездочки роликовой цепи, и специальные нано инструменты. Пожалуйста, посетите сайт  www.tool-tool.com  для получения большей информации.

BW is specialized in R&D and sourcing the most advanced carbide material with high-tech coating to supply cutting / milling tool for mould & die, aero space and electronic industry. Our main products include solid carbide / HSS end mills, micro electronic drill, IC card cutter, engraving cutter, shell end mills, cutting saw, reamer, thread reamer, leading drill, involute gear cutter for spur wheel, rack and worm milling cutter, thread milling cutter, form cutters for spline shaft/roller chain sprocket, and special tool, with nano grade. Please visit our web  www.tool-tool.com  for more info.

 

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金屬經初步加工成型後需修飾金屬表面,美化金屬表面 ,更進一步改變金屬表面的機械性質及物理化學性質等之各種操作過程,稱之為金屬表面處理.或稱之金屬 表面加工(metal surface finishing).

表 面處理的目的可以分四大類:

(1) 美觀(appearance)

為了提高製品之附加價值,賦予製品表面美觀,例如裝飾 性電鍍
(decorative plating) Au, Ag, Rh, Ni, Cr,黃銅等電鍍 (electroplating).

(2) 防護(protection)

為了延長製品的壽命,再製品表面披覆(coating)耐腐蝕之材料,例如保護性電鍍 (protective  plating) Zn,Cd,Ni,Cr,Sn 等電鍍.

 

(3) 特殊表面性質(special surface properties)

1. 提高製品之導電性(electrical conductiuity),例如電鍍Ag,Cu.
2. 提高焊接性(soderability)在通訊急電子工業應用,例如Sn-Pb 合金 電鍍.
3. 提高光線之反射性(light reflectivity ) 例如太空船,人造衛星的 外殼需
反射光線,Ag及Rh的鍍層 被應用上.
4. 減小接觸阻抗(contact resistance)例如在電子組件之Au及Pd電鍍.

(4) 機械或工程性質(mechanical or engineering properties )

1. 提高製品之強度(strenth),例如塑膠電鍍.
2. 提高製品之潤滑性 ( bearing propertries ) 例如多孔洛電鍍
   (porous  chromium plating), 內燃機之鋁合金活塞 (piston) ,鍍   錫Sn以防止汽缸 (cylinder)壁刮傷.
3. 增加硬度(hardness)及耐磨性(wear resistance) ,例如硬洛電鍍(    hard chromium plating).
4. 提高製品之耐熱性,耐候性,抗幅射線,例如塑膠,非金屬之電鍍.
5. 滲碳(carburizing) ,氮化(nitriding) 之防止,例如鋼鐵表面硬化    (case hardening)時在不要硬化部份鍍Cu.

表面處理工業雖然不是工業之主流,但只有透過表面處理,製品的特性及價值才能充份發揮出 來.應用電鍍(plating),陽極處理(anodizing),化成處理(convesion coating),塗裝(coating)等工業技術,達到防蝕,增進可焊性,潤滑性,耐磨性,附著性及鋼材防止滲碳等的多項目的.

所以 表面處理為各種加工製造工業不可或缺的過 從傳統工業到近代高科技,表面處理技術一直扮演非常重要性之角色.例如太空船,人造衛星,積體電路等之發展表面處理技術都有決定性之影響.由於表面處理對 材料月異,帶動相關科技工程之進步.

表面處理技術之種類 從表面處理之特性可分類:


_____ 機械法 __ 珠擊法,切削,搪磨,撒砂,精磨,研磨,超加工.

_____ 冶金法 __ 表面硬化,(淬火,滲碳,氮化),擴散皮膜法.

_____ 化學法 __ 電解研磨,酸洗,化學研磨,酸蝕雕刻.


_____ 表面披覆__ 電鍍,無電鍍,熱浸鍍,熔射鍍,真空蒸著,陰極噴濺,

_____ 無機披覆__ 陽極處理,化成處理,著色,琺瑯處理.

_____ 有機披覆__ 塗裝,橡膠加襯,塑膠加襯.

裝飾電鍍(decorative plating)

裝飾電鍍之主要目的改進 產品之外觀,提高產品附加價值,其主要產品如項鍊,胸 針,耳環等飾物,合法登記之裝飾電鍍廠不足十分之一,地下小廠不需付稅捐,廢水處裡費用等,導致小廠吃大廠,劣幣逐良幣之反淘汰之惡性循環. 所以發展之方向應為大廠增添新設備,提高技術水準,提高產品品質,加強取締公害,自然促使非法及小廠淘或合併經營才能進一步發展.

 

工程電鍍(engineering plating)

工程電鍍之目的是增加產品之耐蝕力,延長使用壽命,改進機械性質等.現在許 多精密模具無法使用機械加工, 也使用電鍍法, 稱之為電鑄 (electroforming).工之規模較大,許多操作採用自動化,多附屬於大規模較大機器製造廠.

     獨立之工程電 鍍廠也大都與大型機器金屬製造廠訂有長期加工契約,其惡性競爭較裝飾性電鍍小,筍嵹禤a經濟發展,工程電鍍技術水準必須精益求精,力爭上游,其發展是大有 可為的工程電鍍使用支援料數量鉅大,因此廢物處理之公害問題需特別重視,稍一不慎將 造成不可收拾的公害.

     一般中小廠為節省開支沒有廢物處理設備,或有也只供參觀檢 查時之用,浪費投資,罔顧員工及環境之安全與衛生.故今後發展方向為如何協助,促使這些小廠家合併始引進或研究開發更經濟更有效新技術.工程電鍍用之化學 品如進鍍成性質之添加劑,多為國外原料供應商之機密,利潤甚高,若能長期研究必能研 就發展成功替代品,以減低本國電鍍工業之成本.

 

鍍錫(tin plating)

鍍錫生產應往高速率之連續生產方向發展,唯有使用高度自動化設備才能節省日益高漲之連續工資及能 源.此種設備國內無法設計製造, 需向國外引進技術,近年來使用鋁罐,鋁箔,塑膠瓶罐,臘紙盒,玻璃瓶等材料越來越普遍, 佔去馬口鐵很大的市場尤其一些錫生產的開發國家如印尼,菲律賓,泰國,馬來西亞等也開始生產馬口鐵,另外有逐漸改無錫鐵皮(tin free steel)之趨勢.

 

熱漫鍍鋅(zinc hot dip coating)

鍍鋅鋼片主要有電鍍式鍍 鋅鋼片及熱浸式鋼片,其中以熱浸式佔大多數,鍍鋅鋼片具有優良耐蝕性與低廉價格.主要用途為建築如用在頂板(roofing),側板(siding ),廣告牌,風管等,其次為電器及機械業.國內鍍鋅鋼片業者需淘汰更新陳舊設備,採用新式連續式熱浸鍍鋅方式生產,產量大,品質佳,產品適用性廣,成本低 並加以配合耐高腐蝕力,鍍層延性,抗熱性,銲接性及美麗彩色塗裝之需求提高製品之品質.如發展出來的鐵鋅合金鍍面,差別鍍鋅,單面鍍鋅及鋁鋅合金鍍面等.

陽極處理(anodizing)

鋁的陽極處理是鋁金屬表面藉由電流的作用形成一層氧化物膜,堅硬耐磨,抗蝕性極高,色澤 優美.鋁合金本身易於加工,強度高,用途很廣,磥瑣T陽處理產品為鋁門窗,傢俱,照相機及儀表外殼另件.鋁材製造極其加工業也日益擴展,鋁陽處理有相當市 場潛力.

     陽極處理之發展例如硬質陽極處理(hard anodizing),在低溫電流亦有用交直流並用之陽極處理.這種硬化之陽極處理的鋁材可用於活塞,汽缸,汽缸內襯,油壓機及渦輪之另件,汽閥,齒 輪,'槍械另件,離合器,煞車圓片,(brake disk),機器另見及工具等.浴溫,電流密度, 溶液成份需自動控制才能嚴格管制成品之品質以達客戶要求.自動化需引進國外技術及大量之資金,所以同時要深入了解國外市場之潛力循序達成自動化.

 

塗裝(coating)

塗裝工業之成長仍應會繼續擴大,應設法取締地下工廠以減少公害保障合法廠商,避免惡性競爭.教育用戶重視 表面處理技術之價值,提高塗裝品質之要求.大廠商應力爭上游,自行發展高級產品而不能只埋怨小廠之低廉競銷.發展之趨勢大多採用粉體塗裝,以節省能源和溶 劑並可減少公害.非溶劑之塗裝和省能源型(紫外線硬化,低 溫硬化)之新產品我國塗裝工業當然應該迎頭趕上.

 

有關表面 處理技術之國內外學會有:

(1) 中國材料科學學會.
(2) 中國鋼鐵學會.
(3) 中國化學會.
(4) 中國腐蝕防蝕學會.
(5) American, Electroplater Society.
(6) American, Electrochemical Society.
(7) American, National Association of Corrosion Engineers .
(8) 英國Institute of metal fishing.
(9) 英國Corrosion Science Society.
(10) 英國Corrosion and Protection Association.
(11) 日本金屬表面技術學會.
(12) 日本金屬學會第三分科會(金屬表面物理化學).
(13) 日本鋼鐵學會.
(14) 日本電器化學協會.
(15) 日本化學學會.
(16) 日本輕金屬學會.
(17) 德國Bunsen Gesellechaff.

 

 

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電鍍之定義

           電鍍(electroplating)被定義為一種電沈積過程(electrodepos- ition process), 是利用電極(electrode)通過電流,使金屬附著於 物體表面上, 其目的是在改變物體表面之特性或尺寸。

 

電 鍍之目的

          電鍍的目的是在基材上鍍上金屬鍍層(deposit),改變基材表面性質或尺寸。例如賦予金屬光澤美觀、物品的防鏽、防止磨耗、提高 導電度、潤滑性、強度、耐熱性、耐候性、熱處理之防止滲碳、氮化 、尺寸錯誤或磨耗之另件之修補。

各種鍍金的方法

  •  
    •  
      •  
        • E=E0+RT/nF ln aMn+/aM

        • E=電極電位

        • E0=電極標準狀態電位 (volt)

        • R=氣 體常數(8.3143 J.K-1MOL-1)

        • T= 絕對零度( K)

        • n=原子價之改變數(電子移轉之數)

        • aMn+=金屬離子之活度 (activity),若極稀薄之溶液,其活度就等於金屬

        • 離子 之濃度(concentration)C。

        • 一般則活度為濃度乘上 活度係數,即a = r *c。

        • 金屬電極之活度,若為純金屬即為1 。

        • 法拉第常數

      •  

    • 溶液性質
      物質反應

      電化學
      化學式

      界面物理化學
      材料性質

      溶液(solution)

                 被溶解之物質稱之為溶質(solute),使溶質溶解之液體稱之溶 劑(solute)。溶劑為水之溶液稱之水溶液(aqueous solution)。

                  表示溶質溶解於溶液中之量為濃度(concentration)。 在一定量溶劑 中,溶質能溶解之最大量值稱之溶解度(solubility)。

                  達到溶解度 值之溶液稱之為飽和溶液(saturated solution),反之為非飽和溶 液(unsaturated solution)。 溶液之濃度,在工廠及作業現場,

      使用易了解及便利的重量百分率濃度(weight percentage)。 另外常用的莫耳濃度(molal concentration)。

      物質反應(reaction of matter)

      在 電鍍處理過程中,有物理變化及化學變化,例如研磨、乾燥等為物理反應,電解過程有化學反應,我們必須充份了解在處裡過程

      中各種物理及化學 反應及其相互間關係與影響。

      電化學(electrochemistry)

      電鍍是一種電沉積( electrodeposition )過程,利用電解體electrolysis)在電極(electrode)沉積金屬,它是屬於電化學之應用的一支。電化學 是研究

      有關 電能與化學能交互變化作用及轉換過程。

                電解質(electrolyte)例子NaCl,也就是其溶液具有電解性質之溶液 (electrolyticsolution)它含有部份之離子(ions),經由此等離子之移動 (movement)

      而能導電。帶陰 電荷朝向陽極(anode)移動稱之為陰離子 (anion),帶正電荷朝向陰極(cathode)移動(migrate)者稱之為陰離子 cations)。這些帶電荷之

      粒子(particles)稱之為離子(ions)。放出電 子產生氧化反應之電極稱之為陽極(anode),得到電子產生還元化應 之電極稱之為陰極(cathode)。整個反

      應過程稱之為電解 (electrolysis)。

      電極電位(electrode potentials)

      電位 (electrode potential)為在電解池(electrolytic)中之導電體,電流 經由它流入或流出。 電極電位(electrode potential)是電極與電解液之間的電動

      勢差, 單獨電極電位不能測定需參考一些標準電極(standard electrode)。

      例如氫標準電極(hydrogen standard electrode)以其為基準電位為0

               電極電位之大小可由Nernst equation表示之:

  • 電鍍法(electroplating)
    無電鍍法(electroless plating) 

    熱浸法(hot dip plating)
    熔射噴鍍法(spray plating) 

    塑膠電鍍(plastic plating)
    浸漬電鍍 (immersion plating) 

    滲透鍍金(diffusion plating)
    陰極濺鍍(cathode supptering)

    真空蒸著鍍金(vacuum plating)
    合金電鍍 (alloy plating)

    複 合電鍍 (composite plating
    局部電鍍 (selective plating) 

    穿孔電鍍 (through-hole plating)
    筆電鍍(pen plating)

    電鍍的基本知識

    電 鍍大部份在液體 (solution) 下進行,又絕大部份是由水溶 液 (aqueous solution)中電鍍,約有 30 種的金屬可由水溶液進 行電鍍, 由

    水溶液電鍍的金屬有:銅Cu、鎳Ni、鉻Cr、鋅Zn、鎘Cd" 、鉛Pb、金Au、銀Ag、鉑Pt、鈷Co、錳Mn、銻Sb、鉍Bi、汞Hg、鎵Ga、銦In、

    鉈、As、Se、Te、Pd、Mn、 Re、Rh、Os、Ir、Nb、W 等。

             有些必須由非水溶液電鍍如鋰、鈉、鉀、鈹、鎂、鈣、鍶、鋇、鋁、La、Ti、Zr、Ge、Mo等。可油水溶液及非水溶液電鍍者有銅、

    銀、 鋅、鎘、銻、鉍、錳、鈷、鎳等金屬。

    電鍍的基本知識包括下列幾項:

標準電極電位(standard electrode potential)

標準電極電位(standard electrode potential)是指金屬電極之活度為 1(純金屬)及在

金屬離子活度為1時之電極電位。

即 E=E0

E=E0+RT/nF ln 1/1 

=E0+0= E0

氫之標準電位在任何溫度下都定為0,做為其他電極之參考電極 (REFERENCEELECTRODE),以氫標準電極為基準0,各種金屬之標 準電位見表

排列在前頭之金屬如Li較易 失去電子,易被氧化,易 溶解,易腐蝕,稱之為濺金屬或 金屬(basic metal)。相反如Au金屬不易失去電子.不易氧化.不易溶解.

容 易被還元稱之為貴金屬(noble metal)。

    電極

    電位

    電 極

    電位

    Li+ -3.045
    Co ?
    Co+2 -0.277   

    Rb?
    Rb+ -2.93
    Ni ? 
    Ni+2 -0.250 

    K? 
    K+ -2.924
    Sn ?
    Sn+2 -0.136

    Ba?  
    Ba+2 -2.90 
    Pb ?  
    Pb+2 -0.126 

    Sr ?
    Sr+2 -2.90
    Fe ?
    Fe+3 -0.04

    Ca ?     
    Ca+2 -2.87
    Pt/H2?
    H+ 0.000 

    Na ?
    Na+ -2.715
    Sb ?
    Sb+3 +0.15 

    Mg ?
    Mg+2 -2.37
    Bi ?
    Bi+3 +0.20

    Al ? 
    Al+3 -1.67
    As ?
    As+3 +3 

    Mn ? 
    Mn+2 -1.18
    Cu ? 
    Cu+2 +0.34 

    Zn ? 
    Zn+2 -0.762
    Pt/OH-?
    O2 +0.40 

    Cr ?   
    Cr+3-0.74
    Cu ?
    Cu+ +0.52 

    Cr ?
    Cr+2 -0.56
    Hg ?
    Hg2+2 +0.789 

    Fe ? 
    Fe+2 -0.441
    Ag ?
    Ag+ +0.799 

    Cd ?
    Cd +3 -0.402
    Pd ?
    Pd+2 +0.987 

    In ? 
    In+3 -0.34
    Au ?
    Au+3 +0.150

    Tl ?
    Tl+ -0.336
    Au ?
    Au+ +1.68

 

Nernst 電位學說

金屬含有該金屬離子之溶液相接觸,則 在金屬與溶液界面,會產生 電荷移動現象,此

等電荷之移動,仍是由於金屬與溶液的界面有電位勢之差別稱之為電位差所引起,此現象

Nernst 解說如下:

            設驅使金屬失去電子變為陽離子溶入溶液中之電離溶解液解壓 (electrolatic

solution pressure)為p而使溶液中的陽離子得到電子 還元成金屬滲透壓(osmotic pressure)為

p,則有三種情況發 生:

  •  
    •  

        E=E0+RT/Nf ln aMn+ / a
        式中為aM為不純金屬之活度

    • (1) P>P時,金屬被氧化,失去電子,溶解成金屬離子於溶液中,因此

           金屬電極本體接收電子而帶負電。

      (2) P<P時,金屬陽離子得到電子被還元沉積於金屬電極表面上,

           金屬電極本身供給電子,因此金屬電極帶正電

      (3) P=P時,沒有產生任何變化

           設金屬與溶液的界面所形成的電極電位為E,當1 mole金屬溶入於

           溶液中,則界面所通過的電量為nF , n為金屬陽離子之價數,即電子之

           轉移數,F為法拉第常數,此時所作功等於nFE,也等於下式:

      n F E= ? ppVdp=RT ? pp dp/p=-RTln P/P 

      \ E=RT/nF ln P/P 

      即金屬陽離子之活度(activity)為 aMn+活 度係數為K,則P= 

      KaMn+於是 

      E= - RT/nF ln p/KaMn+

      =- RT/nF ln P/K +RT/nF ln aMn+

      E在標準 狀態時,即aMn+=1,稱為標準電極電位E ,即 

      E0=- RT/ nF ln P/K + RT/nF ln 1 

      =-RT/nF ln P/R 

      所以純金屬的電極電位用上列式子表示:

      非 純金屬電位則為:

電極電位在熱力學的表示法

  電極反應是由氧化反應及還原反應所組成.

例如Cu ? Cu+++2e- 還原狀態 氧化狀態 可用下列二式表示之 :

  •  
    • Cu(R) Cu+++2e-
    • 氧化反應
    • Cu? Cu+++2e-
    • 還原反應
  •  

    例1: 氧電極反應之電位

    1/2O2+H2O+2e-? 2OH-

    例2: 氯化汞電極反應之電位

    Hg2+2+2e-? 2 Hg

    E=E0- RT/nF ln aHg(s) /aHg2+2

  •  
    •  

        g act=a+b log i 

        b 為係數,i為電流, g act為活化能過電壓其電流i愈大 g act愈大,電鍍中 g act佔 很小一部份,幾乎可以忽略,除非電流密度很大。 

        氫過電壓(hydrogen overvoltage),在酸性水溶液中陰極反應產生 H2氣 體,此額外之電壓稱氫過電壓,即 g H2=Ei-Eeq=Ei-Eeq 式中 
        g H2==氫 過電壓 
        Ei=實際電壓 
        Eeq= 平衡電壓 

        在電鍍時由於氫過電壓的原因使氫氣較少產生,而使許多金屬 

        可 以在水溶液中電鍍。 

        例如鋅、鎳、鉻、鐵、鎘、錫、鉛。

    • (1)電解電位分類為三種:

      M/M+n即 金屬含有該金屬離子的相接觸有二種形式:? 金屬與溶液間之水大於金屬陽離子M+n與電子的結合力,則金屬會溶解失去電子形式

      金 屬陽離子與水結合成為M+n? xH2O,此時金屬電極獲得額外電子,故帶負電這類金屬電極稱之陰電性,如Mg.Zn.及Fe等浸 入酸..鹽類水溶液

      時產生此種電極電位Mt M(aq)+n+ ne-· 金屬與溶液的水親合力小於金屬離子M+n與電子結合力時,金屬離子會游向金屬電極得到電子而沉積

      在金屬電極上, 於是金屬電極帶正電,溶液帶負電o

      (2)金屬M與難溶性的鹽MX相接觸,同時MX又與陰離子之KX相接觸,即(M x MX,KX) 如 化汞電極(Hg2Cl2) o

      (3)不溶性金屬,如Pt,與含有氧化或還元系離子的溶液相接觸,例如Pt x Fe++ .FE++或Pt x Cr+2,Cr+3等o

      界面電性二重層

      在金屬與溶 液的界面處帶電粒子與表面電荷形成的吸附層, 偶極子的排列層以及

      擴散層等三層所組合的區域稱之為界面 電性二重層。

      液 間電位差(liquid junction potential)

      又稱之為擴散電位差(diffusion potential),係由陰離子與陽 離子之移動度不同而形

      成之電位差,通常溶液之濃度差愈大 ,陰陽離子移動度差愈大,則液間電位差愈大。

      過電壓(overvoltage)

      當電流通過時,由於電極的 溶解、離子化、放電、及擴 散等過程中有一些阻

      礙,必須加額外的電壓來克服,這些 阻礙使電流通過,這種額外電壓消除阻礙者稱之

      為 過電壓。此種現象稱之為極化(polarization)。此時陰極、陽極實際電 位與平衡電位之

      差即為陰極過電壓、陽極過電壓。

      過 電壓可分下列四種

      1.活化能過電壓(activiation overvoltage)

                任何反應,不論吸熱或放熱反應皆有最低能障需克服 ,此能障稱為活化能,在電

      解反應需要額外電壓來克服活化能阻礙,此額外電壓之活化能 過電壓,可用Tafel 公式

      表示:

      2.濃度過電壓(concentration overvoltage)

      當電流變大,電極表面附近反應物質的補充速度及反應生成物 逸散之速度不夠

      快,必須 加上額外之電壓,以消除此阻礙,此額外 電壓稱濃度過電壓。在電鍍時可增

      加溫度即增加擴散速率,增加濃 度,攪拌或陰極移動可減少濃度過電壓,電流密度因

      而提高,電鍍的 速率也可增加。

      3.溶液電阻過電壓 (solution resistance overvoltage)

      溶液的電阻產生IR電壓降,所以需要額外的電壓IR來克服 此電 阻使電流通過,此

      額外電壓IR稱之溶液電阻過電壓。在電鍍時可增加溶液導電度,提高溫度以減少此電阻

      過電壓,有時 此IR形成熱量太多會使鍍液溫度一直上升,造成鍍液蒸發損失需冷卻或補

      充 液。

      4.電極鈍態膜過電壓 (passivity overvoltage)

      電解過程,在電極表面會形成一層鈍態膜,如A1的氧化物膜 ,錯離子形成之阻力

      膜,此等膜具有電阻需要額外電壓加以克服 ,此種額外電壓稱之為鈍態膜過電壓。

      電極鈍態膜過電壓 (passivity overvoltage)

      電解過程,在電極表面會形成一層鈍態膜,如A1的氧化物膜 ,錯離子形成之阻力

      膜,此等膜具有電阻需要額外電壓加以克服 ,此種額外電壓稱之為鈍態膜過電壓。

  • 例3: 氫電極反應之電位

    1/2H2(g) ? H++e-

    E=E0-RT/F ln aH+/aH21/2(g)

    電極電位之意義

 

 

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