Spotty Cadmium Plate
Q. What causes cadmium plating to look spotted and uneven? We are using a cyanide-based cadmium plating solution. –E.M.
A. Spotting out of a cadmium deposit is usually caused by one of the following:
1. Rinsing after completion of the plating step is not adequate. The parts should be dipped a number of times alternating in cold and warm water rinse baths, and ending with a warm rinse.
2. You may have a porous cyanide deposit that usually is due to inadequate cyanide in the plating solution. Check the cyanide concentration and adjust accordingly.
An alternative product for passivation...
Why is it important for you to know this?
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.