ELECTROLYTIC CHROMATE TREATED GALVANIZED STEEL SHEET EXCELLENT IN BLACKENING RESISTANCE AND SURFACE APPEARANCE AND ITS PRODUCTION

摘要

PROBLEM TO BE SOLVED: To produce an electrolytic chromate treated galvanized steel sheet excellent in blackening resistance and having a uniform and beautiful surface appearance and to provide a method for producing the same. ;SOLUTION: This electrolytic chromate treated galvanized steel sheet excellent in blackening resistance and surface appearance is the one in which the surface of galvanizing coating of a galvanized steel sheet in which the galvanizing coating has been formed is applied with an oxide layer contg. Al oxide by 5 to 40mg/m² as metallic Al, and the surface of the oxide layer has chromate coating by the coating weight of 5 to 80mg/m² expressed in terms of metallic chromium formed by electrolytic chromate treatment.;COPYRIGHT: (C)1998,JPO