METHOD FOR IMPROVING COATING CURE FOR ARTICLE COATED IN PHOSPHATE-CONTAMINATED ELECTROCOAT COATING COMPOSITION AND ELECTROCOAT COATING COMPOSITION

摘要

An electrocoat coating composition contaminated with phosphate ions is treated by adding zirconium silicate to the coating composition. Aqueous electrocoat coating compositions including (1) a bismuth compound and that is free of tin compounds and free of bismuth hydroxide or (2) having a catalyst consisting essentially of a member selected from the group consisting of bismuth compounds and mixtures of these also include zirconium silicate.