>Basically the 'heavily oxidized' part felt like 120-grit sandpaper compared
>to the usual semi-gloss satin feel of the rest of the aluminum. It
>definitely looks like aluminum rust.
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I would venture to guess that what you may be seeing is "corrosion" on
the aluminum which is somewhat like rusting on steel. Corrosion will
actually eat holes in the aluminum while oxidation in fact puts a
protective coating on the aluminum, even tho it doesn't look so good.
The corrosion as it progressess gets a kind of white powdery finish.
Roy Lashway
