Patent ID: 6761933
Filing Date: 2004-07-13
Classification: B05D,C23C

Abstract:
A method for coating an untreated metal substrate comprising:a) contacting the substrate with a first pretreatment solution comprising a Group IIIB and/or IVB metal and a nitrate, wherein the molar ratio of nitrate to Group IIIB and/or IVB metal is from greater than 18:1 to less than 55:1; b) contacting the substrate of step a) with a second pretreatment solution comprising a reaction product of at least one epoxy-functional material or derivative thereof and at least one material selected from the group consisting of phosphorus-containing materials, amine-containing materials, sulfur-containing materials and mixtures thereof; and c) coating the substrate of step b) with a composition comprising a film-forming resin.