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Nickel oxidation causing adhesion problems?

We are having a problem with an immersion gold flash lifting off the surface of our nickel plating during a gold wedge bonding application. An Auger depth profile showed 15-18 atomic % oxygen peak at the interface of the nickel/gold plating. How much oxide can be tolerated without causing an adhesion problem?

Catherine H [surname deleted for privacy by Editor]
- Colorado Springs, Colorado, USA
2000

Catherine.

If you have a lots of wetting agent in the nickel solution you get a bad adhesion of the gold deposit. If the nickel is to much passivate you should try to activate in sulfuric acid 10 % for 1-2 minutes and neutralize it potassium solution before gold plating.

Regards

Anders Sundman
4th Generation Surface Engineering
Consultant - Arvika,
Sweden
2000

hi

My name's Deniz I'm working in turkey my job electroforming,nickel coating. Sorry I can little English. Your problem's solution: surface coating MgO2 vacuum coating

ok bye

deniz selen
HOLOGRAPHIC MATERIALS - Turkey
2000

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