Enhancement of corrosion resistance of protective coatings formed by spontaneous surface polymerization

The corrosion resistance of a novel protective coating formed by spontaneous polymerization on aluminum was studied. The polymer coating was formed from styrene, n-phenyl maleimide, bismaleimide, 2-(methacryloyloxy) ethyl acetoacetate, and N-isobutoxymethyl acrylamide. A corrosion inhibitor, Nitrolotris (methylene) triphosphonic acid, was also used to protect the aluminum surface under the coating after polymerization. The resultant coating showed very good corrosion resistance in water immersion tests, salt fog and cyclic tests, and excellent adhesive bond strength, especially wet, in a torsional test. Incorporation of an internal plasticizer monomer, ethylene glycol methyl ether acrylate further enhanced coating durability.