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Stainless compatibility with trivalent CCC on aluminum casting

Q. I'm experiencing what I think is galvanic corrosion of a stainless part used in an assembly with a trivalent CCC aluminum die cast part while salt fog testing. Is it truly galvanic corrosion? If so, what is the mechanism?

Matt Byrne
engineer - Cleveland, Ohio
July 1, 2008

A. Hi, Matt. I would doubt it since stainless is far more noble than aluminum.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
July 1, 2008

Thanks Ted. I am also going to investigate the possibility of crevis type pitting corrosion. The stainless part is press fit into the aluminum part with very tight tolerances.

Matt Byrne [returning]
- Cleveland, Ohio
July 3, 2008

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