We plate sulfamate nickel on steel components to build up worn areas. Recently we have found that the nickel is very hard and almost impossible to machine properly. What might cause this problem?
Q. We plate sulfamate nickel on steel components to build up worn areas. Recently we have found that the nickel is very hard and almost impossible to machine properly.
What might cause this problem? E. W.
A. You did not mention in your e-mail what type of maintenance you perform on the sulfamate plating bath. However, I’m will to bet that you are not following a regular testing and maintenance program.
“Dirty” sulfamate baths are most often the cause of increased hardness. Both organic and metallic contamination must be kept out of the bath. Your bath must be dummyed and carbon treated on a regular basis. Platers tend not like carbon treating, but this should not be the case. Vendors that sell filtration equipment can help you set up a regular carbon filtration process.
Vendors can be found by searching www.pfonline.com/plate/index.html under Plating and Anodizing Equipment. If you are using a stress-relieving additive, be sure to use only enough to give zero stress.
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.
An overview of precious metal electroplating processes.
An overview of decorative and hard chromium electroplating processes.