[Shop-talk] alternative fluids for parts washers
David Scheidt
dmscheidt at gmail.com
Fri Apr 16 21:54:50 MDT 2010
On Fri, Apr 16, 2010 at 11:05 PM, Doug Braun <doug at dougbraun.com> wrote:
> BTW, solvents containing methylene chloride (paint remover) can do nasty
> tings in the presence of aluminum:
>
>
Any chlorinated solvent will react with aluminum (and usually magnesium,
too).
Methylene chloride doesn't react vigorously, compared to some other solvents
like trichloroethylene or 1,1,1-Trichloroethane (which is banned as an ozone
depleter) which react vigoursly enough to start fires (and are
auto-catalyzing!) and plumes of phosgene and hydrochloric acid. Methylene
choloride doesn't react with oxidized aluminum, and only slowly with pure
aluminum, so it's reasonably safe to use it. that said, I see little reason
to have chlorinated solvents around the home shop.
>
> Apparently, the aluminum itself is not corroded. I guess that's why
> MC-based stripper is sometimes called "aircraft stripper".
>
> It does, but not with the layer of aluminun oxide that quickly forms on any
aluminun surface.
--
David Scheidt
dmscheidt at gmail.com
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