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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
(Ted is available for instant or longterm help)
finishing.com - Pine Beach, New Jersey
2003

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