Patent ID: 8133594
Filing Date: 2012-03-13
Classification: C23C,C25D,Y10T

Abstract:
1. A coated steel sheet for a container comprising: a steel sheet coated on at least one side of the steel sheet with a chemical conversion coating film, the chemical conversion coating film having a thickness, and comprising an oxide compound layer, a phosphate layer, and a copresent layer; wherein the oxide compound layer is present at a depth of 40 to 100% of the thickness of the chemical coating conversion film from the surface of the chemical conversion coating film, and is defined by an XPS analysis peak showing the presence of a zirconium oxide compound of the oxide compound layer, the zirconium oxide compound peak having a height at least two times the maximum noise height of the oxide compound layer in a spectral chart obtained by the XPS analysis; the phosphate layer is present at a depth of 0 to 40% of the thickness of the chemical conversion coating film from the surface of the chemical coating conversion film, and is defined by an XPS analysis peak showing the presence of a zirconium phosphate compound of the phosphate layer, the zirconium phosphate compound peak having a height at least two times the maximum noise height of the phosphate layer in a spectral chart obtained by the XPS analysis; and the copresent layer is positioned between the oxide compound layer and the phosphate layer, wherein the zirconium oxide compound and the zirconium phosphate compound are copresent in the copresent layer.