Aluminium alloys are alloys in which aluminium is the predominant metal. The highly reactive nature of aluminium metal is normally masked by the protective oxide film (White rust), which readily forms in moist air and renders the metal kinetically stable. Galvanic corrosion can occur when an aluminium alloy is placed in electrical contact with other metals with a more negative corrosion potential than aluminium.
Thoroughly clean the affected surfaces of all soil and grease residues with a d-limonene (citrus) based solvent cleaner (P21S® Total Auto Wash) prior to processing.
Brush it down with a wire brush to get rid of all the powder.
Clean the surface with PrepSol and then sand any scratched or damaged areas with Norton 3X Sandpaper (p-graded aluminium oxide grain,) 60, 80 or 100 grit sand paper, sand wet or dry with a rubber sanding block.
Use a tack rag and wipe the area, using a light pressure
Then treat with etch primer, maybe two or more coats.
Follow with ordinary primer and top coat.
Repairing Scratched or Curbed Wheels
Damage to your wheels can come from: curb damage, wheel weight scratches, acid spray wheel cleaning, lug nut impact wrench, auto accident, and road salt, which leads to oxidation. These blemishes can ruin the appearance of your car; refurbishment can help retain its value.
Replacement costs for alloy wheels can cost hundreds of dollars, but the restoration of your scuffed alloys and scraped wheel rims makes your whole car look pristine again