微酸性体系电沉积光亮锡钴锌合金的研究

Study of electrodepositing bright Tin Cobalt Zinc alloy from weak acid solution

本文提出一种电沉积光亮锡钴锌三元合金的新工艺．其溶液组成及操作条件为：Ｎａ３Ｃ６Ｈ５Ｏ７·２Ｈ２Ｏ１００～１５０，Ｎａ２ＥＤＴＡ·２Ｈ２Ｏ２０～３０，ＳｎＣｌ２·２Ｈ２Ｏ１５～２０，ＣｏＳＯ４·７Ｈ２Ｏ２５～３５，ＺｎＣｌ２１５～２０ｇ·Ｌ－１；稳定剂ＷＤＺ－１６０～１００，光亮剂ＷＤＺ－２１５～２０ｍＬ·Ｌ－１．ｐＨ＝４～６，Ｄｋ＝０．５５．０Ａ·ｄｍ－２，Ｔ＝５～３５℃．在此条件下可得到光亮的含Ｃｏ为０．５～３．５％、Ｚｎ为１～１０％的锡钴锌三元合金沉积层．讨论了溶液组成对沉积层组成的影响．

A new process of electrodeposting bright Tin Cobalt Zinc alloy from weak acid solution is proposed in this paper. The solution compositions and operating conditions are Na 3C 6H 5O 7·2H 2O 100～150,Na 2EDTA·2H 2O 20～30,SnCl 2·2H 2O 15～20,CoSO 4·7H 2O 25～35,ZnCl 2 15～20 g·L -1 ;stabilizer WDZ 1 60～100, brightener WDZ 2 15～20 mL·L -1 ; pH=4～6, D K = 0.5～5.0 A·dm -2 , T= 5～35 ℃. A bright Sn Co Zn deposit having Co about 0.5～3.5% and Zn about 1～10% is produced. The effects of bath compositions on Co or Zn content in deposit is also discussed.