Patent ID: 6777034
Filing Date: 2004-08-17
Classification: B05D,B23K,C08G,C09D,C23C,Y10T

Abstract:
A method for preparing a weldable, coated metal substrate, comprising the steps of:(a) treating a surface of a metal substrate with a pretreatment coating having less than 0.05 weight percent of chromium containing materials, the pretreatment coating comprising a reaction product of at least one epoxy-functional material and at least one material selected from the group consisting of phosphorus-containing materials, amine-containing materials and mixtures thereof to form a substrate having a pretreated surface; and (b) applying a weldable coating to the pretreated surface to form a weldable, coated metal substrate, the weldable coating comprising a substantial amount of electroconductive pigment and a binder, wherein said substantial amount is generally greater than about 10 volume percent on a basis of total volume of electroconductive pigment and binder.