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Stripping Aluzinc and Then Trivalent Zinc Chromate

May 26, 2009

We have done some testing on pre-plated Aluzinc material that has been stripped and then plated with trivalent zinc chromate. The salt spray (96 hours) results were a disaster.

The Aluzinc may not have completely been removed (still evaluating) leaving splotchy black spots and some white rust.

Any ideas? Thanks!

Ruth Pierson
Engineer - Lewisville, Texas, USA

June 19, 2009

Hi, Ruth, I am confused. If you stripped the Aluzinc, what did you apply the trivalent chromate to? You can't chromate bare steel.

Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Ted is available for instant help
or longer-term assistance.

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