由锌杂质引起的氰化滚镀铜故障分析及处理

Malfunction analysis and treatment caused by zinc impurity during barrel cyanide copper plating

锌合金压铸件氰化滚镀铜液常受锌杂质污染,导致阳极钝化和镀层粗糙。分析了阳极钝化的化学反应过程,阐述了用氨水处理锌杂质的机理和方法。向镀液中加1mL/L25%的氨水,可促进锌和铜的共沉积,使锌杂质的浓度降低,2d后镀液恢复正常。氨水处理法简单,便于操作,不影响正常生产,明显优于硫化物沉淀法。

The barrel cyanide copper plating bath is often contaminated by zinc impurities during electroplating, resulting in anode passivation and roughened coatings. The chemical reaction process of anode passivation was analyzed, and the mechanism for treatment of zinc impurities using ammonic water was described. The codeposition of zinc and copper accelerates after adding 1 mL/L of 25% ammonia solution to the plating bath, thereby reducing the concentration of zinc impurities, and the plating bath recovers to its usual level 2 days later. The ammonia treatment method is simple, convenient in operation, has no effect on regular production, and markedly superior to sulfide precipitation method.