At my employer, Delta Air Lines, we have various "grit" of what amounts to 3M Scotch-Brite pads that attach to a right angle grinder and they make short order of corrosion on most any aluminum surface. They will remove a surprising amount of metal, too.
Then follow with primers and paints made specially for aluminum.
When Ford came out with the aluminum bodied F150 they had to teach all the dealer body people how to use the different aluminum specific paint materials.
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