No passwords, No popups, No cost, No AI:
we earn from 'affiliate link' purchases, making the site possible

Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

  The authoritative public forum
  for Metal Finishing since 1989

-----

Dull spots on bright tin plated copper

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
2002

A. I would say that spots are caused by lack of a neutralizing rinse, you can use caustic soda ⇦liquid caustic soda in bulk on Amazon [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
May 16, 2008

(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: