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Letter 26017
Cleaning of Aluminum without Degreasing
[Israel]
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I am working in a company named SSNP and we are dealing mainly
with manufacturing of metals parts mostly Al and SS We need to clean
these parts before sending them to customers remove all the oil
residues and carbon since one of our customer machines is very
sensitive to. We know how to clean SS but we are looking for a
formula for cleaning Al 6061, we would not like to use degreazer we
are looking for alkaline cleaners that don''t attack Al and carbon
remover.
Nissim Poliker
Engineer - Netanaya, Sharon, Israel
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Aluminum is amphoteric, dissolving in both acids and alkalis.
Further, aluminum can't be electrocleaned. So if you rule out solvent
degreasing, your options are limited. But you can use a hot
non-etching alkaline soak cleaner; these are available from any
plating process supplier, as opposed to brewing your own. Ultrasonic
cleaning can be a big help for aluminum.
I'm not sure quite what you mean by 'carbon remover', but you do
not want to allow any heat treatment processes with the oil still on
the parts.

Ted Mooney, P.E.
finishing.com Inc. - Brick,
NJ
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