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topic 17548

Dull spots on bright tin plated copper


2002

Q. We have acid tin brightener bath we found dulls spot on copper pieces after one month storage turn dark spot

ehab ahmed abd alla
sweedy - cairo . egypt


May 16, 2008

A. I would say that spots are caused by lack of a neutralizing rinse, you can use caustic soda on a second rinse after the tin plating, make sure to keep your pH at 10, and after it have a hot rinse prior to the dryer.

Carlos Rodriguez
- Juarez, Chihuahua, Mexico



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