Where the world gathers for
plating, anodizing, & finishing Q&As since 1989

-----

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 [affil link] 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

finishing.com is made possible by ...
this text gets replaced with bannerText

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: