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Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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No Rinse Chromate Conversion

I work with a company that uses a chromate conversion for aluminum. The processes is used to treat the aluminum to meet salt corrosion requirements and for aesthetics. Our ultimate goal is to reduce chromium in the effluent. I was wondering if anyone has any insight or experience into no-rinse treatment systems. I am particularly interested in what the final products looks like. Are there problems with streaking/blotching?

Thank you,

James Rabideau
- Green Bay, Wisconsin, USA
2006

Dry-in-place chromate conversion IS used on continuous coil in the steel mills where it is squeegeed off. I do not think piece part dip tank no-rinse chromate yet been developed.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

2006

I would say it's not universally used rather than saying it's not yet developed. Dried-in-place chromates are available both for piece parts and as a touchup pen.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2006

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