Patent ID: 6572983
Filing Date: 2003-06-03
Classification: B05D,C09D,C23C,Y02T,Y10T

Abstract:
A method of treating a metallic surfacewhich comprises treating a metal-coated steel panel with a nonchromate metallic surface treating agent, containing, in each liter thereof, (a-1) a silane coupling agent and/or a hydrolytic condensation product thereof in amount of 0.01 to 100 g/l, (a-2) water-dispersible silica in a proportion of 0.05 to 100 g/l (solids), and (a-3) a zirconium compound in an amount of 0.01 to 50 g/l in terms of zirconium ion and/or a titanium compound in an amount of 0.01 to 50 g/l in terms of titanium ion, drying the treated steel panel and coating it with an anticorrosion coating agent containing, in each liter of an aqueous resin solution or dispersion, (b-1) a silane coupling agent and/or a hydrolytic condensation product thereof in an amount of 0.1 to 50 g/l, (b-2) water-dispersible silica in an amount of 10 to 500 g/l (solids) and (b-3) at least one phosphorus-containing ion selected from among phosphate ion, phosphite ion and hypophosphite ion in an amount of 0.1 to 10 g/l, and wherein said nonchromate metallic surface treating agent contains one or more members selected from among sulfide ion, thiosulfate ion, persulfate ion and a triazinethiol compound in a an amount of 0.01 to 100 g/l.