Also even if you manage to anodize, wash and seal it, trace Cl- ions in the pores of the oxide layer will cause fairly rapid corrosion in service. Google: aluminum chloride corrosion
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Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED)
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"The most widely used bath is dilute sulfuric acid, typically about 1 molar or 10 weight percent concentration. Other baths used for particular applications are made with oxalic acid or phosphoric acid."
'Drano' is a brand name of drain cleaners, the most common variant of which is largely NaOH (lye). It is very much incompatible with aluminum. Muriatic acid is just as bad.
I think sulfuric acid is the usual anodizing medium for aluminum.
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