氰化镀锌无氰化的转化方法

Non-cyanide converting method for cyanide plated zinc

Abstract

The invention relates to a non-cyanide converting method for cyanide plated zinc. Non-cyanide conversion is as follows: a brightening agent (HT) and a complexing agent (HEDP) are added into plating liquid to carry out zinc plating by stopping adding NaCN and ZnO into the plating liquid. The plating liquid comprises the following components (g*L-1): 10-less than 5 of cyanide, 8-15 of zinc oxide, 60-120 of NaOH, 15-20 of HEDP and 2-3 of HT. The electroplating technical condition comprises the temperature of 10-45 DEG C, the cathode current density (A*dm<-2>) of 0.5-4 and the average current efficiency of 70-78 percent. The corrosion resistance, the bonding capability and the color change resistance of a plating layer completely meet the practical production requirement. The plating liquid has high impurity resistance and is still stable for continuously using for one month. The converted process does not use the cyanide, is easy to process electroplating wastewater and is a more clean production process, thereby replacing a cyanide zinc plating process in a peace way.
氰化镀锌无氰化的转化方法,无氰转化是指在镀液中停止添加NaCN和ZnO下,在镀液中加入光亮剂(HT)和络合剂(HEDP)进行镀锌。其条件是:镀液中含有(g·L-1):氰化物10~<5,氧化锌8~15,NaOH 60~120,HEDP15~20,光亮剂HT 2~3。电镀工艺条件为:温度为10~45℃,阴极电流密度(A·dm<sup>-2</sup>)为0.5~4,平均电流效率为70~78%。镀层耐蚀能力、结合力、防变色性能完全满足实际生产要求。发明的镀液抗杂质能力强,镀液连续使用一个月仍然稳定。转化后的工艺不使用氰化物,同时电镀废水易于处理,是一种较清洁的生产工艺。从而通过一种和平方式淘汰了氰化镀锌工艺。

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    CN-104294329-AJanuary 21, 2015梁建波Alkaline zinc-nickel alloy plating solution and electroplating process