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Re: [Shop-talk] alternative fluids for parts washers

To: Randall <tr3driver@ca.rr.com>, David Scheidt <dmscheidt@gmail.com>
Subject: Re: [Shop-talk] alternative fluids for parts washers
From: Doug Braun <doug@dougbraun.com>
Date: Fri, 16 Apr 2010 20:05:07 -0700 (PDT)
BTW, solvents containing methylene chloride (paint remover) can do nasty tings
in the presence of aluminum:

Aluminum, magnesium or their alloys are
not
recommended for constructing storage
tanks to hold any chlorinated solvent.
Aluminum parts should not be stacked
overnight or for longer periods in a dip
tank
or when wet with methylene chloride
because solvent decomposition may
occur.
This reaction can be particularly dangerous
in enclosed systems of
aluminum construction,
generating heat, pressure and corrosive
gases which may
rupture the equipment
with explosive-like force. Dilution of methylene
chloride such as practiced in the
adhesives, coatings and paint industries
further
increases the sensitivity of the solvent
to aluminum. Therefore,
aluminum equipment
should not be used.

Apparently, the aluminum itself is not
corroded.  I guess that's why MC-based stripper is sometimes called "aircraft
stripper".

Doug

--- On Fri, 4/16/10, David Scheidt <dmscheidt@gmail.com>
wrote:

> From: David Scheidt <dmscheidt@gmail.com>
> Subject: Re: [Shop-talk]
alternative fluids for parts washers
> To: "Randall" <tr3driver@ca.rr.com>
>
Cc: shop-talk@autox.team.net
> Date: Friday, April 16, 2010, 6:41 PM
> On Fri,
Apr 16, 2010 at 5:07 PM,
> Randall <tr3driver@ca.rr.com>
> wrote:
> 
> > > No
personal experience, but I have been told you
> can wreck aluminum
> > > parts
with Simple Green.
> >
> > I believe the concern is real, but only under
fairly
> extreme circumstances.
> > The problem arises with fairly thin
riveted sheet
> (like aircraft skin),
> > where the SG can soak into tiny
crevices between
> sheets or around rivets
> > and
> > get trapped.  Over a
long enough period of time
> (and likely thermal
> > cycling,
> > etc.) it can
corrode the aluminum enough to weaken
> it.  ISTR there was
> > actually an
aircraft skin failure traced to this, and
> so it's now forbidden
> > to use
any strongly basic degreaser (like SG) on
> aircraft.
> > \
> 
> 
> It's also
probably dependent on alloy.  High strength
> aluminum alloys tend
> to be
more prone to crevice corrosion than the sorts that
> are used for
>
castings.  but htere are any number of less nasty
> degreasers available these
> days (usually with better pricing, too.).
> 
> 
> -- 
> David Scheidt
>
dmscheidt@gmail.com
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