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Metal finishing Q&As since 1989

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CLEANING ALUMINUM PARTS

We manufacture parts made of Aluminum and then we remove the oil using N-Propyl Bromide (Techtride)as a vapor degreasing solution. Lately, we are having residue problem, always at the same place, that will not come off the degreasing but will wipe off. The residue is not visible prior to degreasing. Ocassionaly, white stains also appear in the parts (like the stain seen on a glass from the dishwasher). What kind of bath can we dip them into so they can be cleaned in bulk?

Don Nalupta
Quality Manager - Orange, NJ
March 5, 2008

You need to know what the soil is in order to prescribe a treatment regimen. But things like polishing compounds can have insoluble grits dispersed in the compound such that the solvent removes only part of the compound, Have you tried ultrasonic cleaning?

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
March 5, 2008

QUESTION COMMENT,

The residue is due to oil or is a kind of oxidation?

Jose Castellanos
- Minneapolis, MN, USA
March 19, 2008

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