Study on Corrosion Resistance of Cationic Waterborne Acrylic Coating

Aiming at understanding the corrosion resistance of siloxane hydrolyzate cured cationic waterborne acrylic coatings, waterborne metal anti-corrosive coatings were prepared by cationic hydroxy acrylic resin dispersion containing tertiary amine group cured by siloxane hydrolysate WKHY-601.With using DSC, TGA, FT-IR and CHI660E electrochemical workstation, the curing mechanism of the coating and the main factors affecting its salt corrosion resistance were researched systematically.Results showed that the curing of the coating was achieved by the reaction of the silanol hydroxyl group and the alcohol hydroxyl group in the resin and the self-condensation of the siloxane hydrolyzate to form a cross-linked network.The content and type of the tertiary amine group in the resin and the amount of the curing agent siloxane hydrolyzate influenced the salt corrosion resistance of the coating film.As the content of tertiary amine groups increased, the self-corrosion potential of coating increased and the self-corrosion cur