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BLACK CHROMATE ON ALUMINIUM

I need some information about BLACK CHROMATE ON ALUMINIUM.
I need to know if Al has this kind of chromate coating or not and if yes, what is the bath solution contents?

Ali Eskandari
- Iran
May 8, 2008

May 9, 2008

Hi, Ali. In this country (and probably most of the world) few if any chromating shops mix their own black chromating solutions from raw chemicals. Rathr, they buy proprietary (patented or trade-secret) formulations. I think that is what you should do. But you can search through expired patents for formulations. We cannot print any formulations here unless the responder tells us where it is published because we have no practical way of knowing whether it is public knowledge or trade secret. Sorry, and good luck.

Regards,

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