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Stainless compatability with trivalent CCC on aluminum casting [Ohio] 

July 1, 2008

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 truely galvanic corrosion? If so, what is the mechanism?

Matt Byrne
engineer - Cleveland, Ohio

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

Regards,

Ted Mooney, P.E.  finishing.com Brick, New Jersey

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
- Cleveland, Ohio