Cloudy Decorative Chrome
Q. We have a decorative chrome plating process using hex-chrome and find that, in the high current density areas, there is cloudiness more often than not. What should we be looking for to solve this problem? B.R.
A. The first thing you should do is determine if you see these cloudy spots prior to the chrome plating step (after the parts come out of the bright nickel plating bath). If the parts look good, then the chromium plating step is most likely the culprit. Investigate the temperature current balance. Your currents may be too low for the temperature used or vice versa.
To help you solve this problem I am sending you a copy of the Chromium Tank Doctor, which has a lot of good troubleshooting steps for classic chrome plating baths.
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 decorative and hard chromium electroplating processes.
The reasons for installing an in-house cold blackening system are many and varied.