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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.
With pyrophosphate copper-tin alloy instead of toxic cyanide, the new plating bath coating quality is good, but the plating bath used a long time, the coating quality decreased significantly, mainly due to the cathode current efficiency, so that the bath Significant changes in composition. So that the main components of the bath content and the normal content of a larger deviation, thus affecting the quality of the coating.In order to maintain the stability of the pyrophosphate bath in the electrode process, the authors use a passive anode and copper-tin anodes alternately, it is better Solve the problem of the decline of the quality of the old plating solution.