We are having problems with a yellow stain on some of our tin plated parts. The plating process consists of an initial copper deposit followed by a tin deposit and alkaline rinse. Do you have any suggestions on how to eliminate or at least minimize this problem? S.T.
Here are a few things that can cause the staining you are observing.
If you need more help with the troubleshooting of this problem get yourself a copy of the book, Trouble in Your Tank, 3rd Edition, by Lawrence J. Durney, which is published by Products Finishing's owner Gardner Publications, 888-527-8803.