White Patches

What is a good remedy for white patches in an alkaline non-cyanide zinc plating bath?

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Q. What is a good remedy for white patches in an alkaline non-cyanide zinc plating bath? W.L.

A. Many of the alkaline non-cyanide zinc plating baths are proprietary in nature. You should obtain specific troubleshooting information from your chemical ven-dor. There are, however, a number of general solutions to the problem you should consider. Possible causes of this problem are: low brightener concentra-tion, high metal content, hard water contamination, and, in some cases, iron contamination. 

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