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topic 7973

Bleach Attack 6061 T6 Chromate Conversion Coating


Could a 5 ppm bleach solution remove a chromate conversion coating and accelerate corrosion on 6061 T6 Aluminum?

Stephen Pomer
- Groveland, Massachusetts

First of two simultaneous responses-- (2001)

I think it could. If you are concerned about this, then you should investigate. Make a few samples and expose half of the samples to the bleach. Then, put the whole group in a salt spray or humidity cabinet and note hours to onset of white corrosion. I'll bet the group exposed to the bleach will corrode significantly faster. This simple experiment should answer your question without having to rely on a stranger's educated guess.

tim neveau
Tim Neveau
Rochester Hills, Michigan

Second of two simultaneous responses-- (2001)

Bleach solutions are mostly alkaline. I think neither anodized nor chemical conversion treated aluminum parts can last long in this corrosive solution.

Dado Macapagal
- Toronto, Ontario

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