I would treat it with clear alodine 1001 before spraying it with either a clear topcoat or clear powder coat.
Quote:
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Alodine® 1001™ Conversion Coating is a nonflammable, chromic acid based, coating chemical that will produce a chrome conversion coating on aluminum and its alloys. The coating formed by Alodine 1001 is clear in color and it becomes a part of the aluminum surface. This chrome conversion coating offers the best affordable substrate for both paint adhesion and corrosion resistance. Alodine 1001 is used when it is desired to retain the silver white aluminum.
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Disclaimer: I only use the tinted alodine, so I do not know how "clear" the clear alodine actually turns out. Google images shows this as a comparison, though:
