Patent ID: 7186467

Claim:
A black galvanized steel sheet comprising: a galvanized steel sheet; a black coating layer formed on the galvanized steel sheet; a composite coating layer formed on the black coating layer and containing a phosphate ion, a vanadate ion, a metal ion, an α, β-unsaturated carboxylic acid and a material comprising an unsubstituted or substituted glycoluril monomer, said material being selected from the group consisting of monomers; a polymer compound of the monomer; a condensation product of the monomer; a mixture comprising the monomer, the polymer compound and the condensation product, wherein the monomer is represented by the formula wherein R 1 to R 4 are identical or different and are hydrogen, C n H 2n+1 , C n H 2n OH or C n H 2n OC m H 2m+1 , wherein m and n are integers from 1 to 4; and an organic resin layer formed on the composite coating layer.