Cyanide Copper Plating reinvents Itself

摘要

One of the outstanding properties of cyanide copper baths is excellent throwing power (TP) or metal distribution ratio, especially when compared to the acid sulfate systems. As most plating thickness specifications on parts usually do not apply to the high CD area, but to the average CD region, or more often, to a low CD area, improving the metal distribution ratio may be the best route to increasing average metal thickness. An increase in CD will decrease TP, and there may be little or no significant thickness increase in the low CD areas. Baths with higher metal concentrations are less affected in this respect. RS baths may have superior TP to that of HE baths, assuming that HE baths in use do not have brighteners and other additives in them, including Rochelle salts or proprietary equivalents, a rather rare occurrence.