Patent ID: 6143365
Filing Date: 2000-11-07
Classification: B05D

Abstract:
A process for forming an autodeposited coating with improved thermal stability on an active metal substrate, said process comprising operations of:(I) contacting the active metal substrate with an autodepositing composition that comprises as its predominant coating resin a copolymer of vinylidene chloride, residues of vinylidene chloride constituting at least 50% by weight of the total weight of said copolymer, so as to form on the active metal substrate a wet adherent autodeposited coating;(II) contacting the wet adherent autodeposited coating formed in operation (I) with a water-based liquid rinse comprising a concentration of tripolyphosphate ions that is at least about 0.5 g/l, so as to form a phosphate-rinsed wet adherent autodeposited coating; and(III) heating the phosphate-rinsed wet adherent autodeposited coating so as to convert it to a cured dry autodeposited coating.