AUTODEPOSITING COATING COMPOSITION AND PROCESS AND COATED METAL ARTICLES THEREFROM

摘要

A water-based autodepositing coating composition that contains dissolved and/or dispersed anionic polyester resin comprising the condensate of (a) a polyhydric alcohol component and (b) an acid component in addition to acid, and metal ions and/or other oxidizing agents provides a coating composition that can impart an excellent corrosion resistance, adherence, and heat resistance to metal surfaces when appplied to the metal surfaces and dried into place thereon, preferably with the use of heat. A rinse is usually preferably interposed between the application of the auto-depositing composition and the drying operation.