Abstract
Polyacrylamide (PAM)-grafted dextrine (DEX) copolymers were prepared by heating a film-forming precursor solution consisting of PAM, corn starch-derived DEX, cerium (IV) nitrate hexahydrate, and water, at 150° or 200°C; these solutions were applied as water-based primer coating systems to aluminum (Al) substrates. Grafting PAM on the DEX not only inhibited the fragmentation of DEX structures caused by oxidation at 200°C in air, but also aided in fabricating coating films that were less susceptible to moisture and minimized the rate of permeation of electrolyte species through the film layers. In addition, the grafted DEX coating films favorably reacted with the Al substrate to form Al-O bonds at interfaces. Consequently, Al panels coated with a highly grafted DEX copolymer had a salt-spray resistance of 600 hr.
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