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Nickel plated surface (on berylium copper) turned greenish

Beryllium copper part, plated with electro-nickel was found with greenish surface.
What would be the root cause of this ?

YK Wong
Supplier - Kulim, Kedah, Malaysia
2007

It sounds to me like the copper is corroding, which is attributable either to inadequate nickel plating for the planned exposure conditions, or the exposure conditions not under control.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007

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