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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
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey

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