Aloha, fun & authoritative answers -- no cost, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Metal finishing Q&As since 1989

-----

Brown Stains on plated zinc diecastings

My nature of work is Vendor In-Coming Technician. Why does zinc die casting surface having brown stains after Copper - Electroless Nickel or copper - Brass plating.

Thank you.

Mustafa Taib
- Singapore
2003

Sounds like cyanide bleed-out to me, in which case you would need excellent rinsing, preferably alternating hot and cold several times.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2003

(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: