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.
Masking is employed in most any metal finishing operation where only a specifically defined area of the surface of a part must be exposed to a process. Conversely, masking may be employed on a surface where treatment is either not required or must be avoided. This article covers the many aspects of masking for metal finishing, including applications, methods and the various types of masking employed.
Types of anodizing, processes, equipment selection and tank construction.
Applications, plating solutions, brighteners, good operating practices and troubleshooting.