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

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CLEANING ANODIZED SURFACES

IN REGARDS TO: INSPECTING ANODIZED SURFACES

I RELIEVE ALUMINUM BLACK ANODIZED PARTS THAT SOMETIMES EXHIBIT A CLOUDY APPEARANCE.

DOES THIS AFFECT FIT, FORM, OR FUNCTION?

WHAT CHEMICALS ARE SAFE TO USE ON ANODIZED SURFACES TO REMOVE THIS CLOUDY "FILM"?

TERESA METZ
- ROLLING MEADOWS, Illinois USA

Anodizing conditions, if not properly controlled may lead to reverse reaction, I mean, the coating starts to be dissolved by the electrolyte rather than build up.

A high electrolyte temperature maybe causing the problem, or if these cases are isolated, these may be caused by loosening of rack-to-parts contacts during anodizing.

Dado Macapagal
- Toronto, Ont

Further to my reply, if the conditions I stated caused the cloudy appearance, I guess there's not much you can do except to rub and wipe the parts with clean cloth. If the coating specs do not meet your requirements, you'll have to re-anodize them.

Dado Macapagal
- Toronto, Ont

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