PEOPLE helping each other -- No AI, no cost, no reg'n, no damn popups
(As an Amazon Associate & eBay Partner we earn from qualifying purchases)

Curated with aloha by
Ted Mooney, P.E. RET

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

  The authoritative public forum
  for Metal Finishing 1989-2025

-----

Discolored finish after 150 °C bake

2006

Hi, I tried to search but could not successfully find related topics.
need some expert opinion on this case. The matte Sn plated leads become discolored after bake. supposedly, the bake temp is 150 °C. My question is if it is valid to include in the investigation the base leadframe (Copper)?

Thanks!

Rachel Ann Hopkins

After matte tin, try chromic acid immersion (if possible, cathodic voltage 4-6 V).

John Hu

2006

(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: