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On 14 Oct 2006 12:38:50 -0700, "veeduber@isp.com" <veeduber@isp.com>
wrote:
>So do not use lye. Unless you know how to, when to and why. Do use
>phosphoric acid, then neutralize it good with copious amounts of
>BOILING HOT water (and use an oven or a heat gun to make sure all the
>cracks are water-free after).
But be careful here; 20xx and 60xx can handle 350F for a pretty long
time with few problems, but 7075 is less tolerant. A heat gun can
overdo what you want if you aren't careful. I do not know a good way
to know when you overheat; those optical thermometers are probably
pretty good, though.
Limit those temperatures to 250F for safe measure.
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Re: Lye as an aluminum cleaner?
