焦磷酸盐电镀铜锡合金电极过程

用焦磷酸盐镀铜锡合金代替剧毒氰化物,新配镀液镀层质量很好,但镀液使用时间较久后,镀层质量明显下降,主要原因是阴阳极电流效率不等,使镀液成份发生较大变化。以致使镀液主要成份的含量与正常含量有较大偏差,因而影响镀层质量.为了维持焦磷酸盐镀液在电极过程中稳定,作者采用钝性阳极与铜锡合金阳极交替使用,较好地解决了老镀液镀层质量下降的问题.

On Electrode process of Electroplating Cu-Su Alloy with Pyrophosphate-Stannate

In the electroplating of Cu-Sn alloy, pyrophosphate-stannate may be used instead of cyanide. The coating has high quality in newly made bath solution. But the quality of the coating decreases obviously, when the bath has been used for a long time. It is found that the degradation of the coating is because the current efficiency on anode is not epual to that on cathode, which changes the composition of the bath so that the concentrations of the principal components in the bath deviates from the standars concentrations greatly. By using a passive anode and a Cu-Sn alloy anode alternatively, the composition of the bath can be maintained, then the coating will keep high quality all the time.