ORGANIC COMPOSITE Mg BASED PLATED STEEL SHEET

• Main Authors: NOSE KOICHI, TOKUDA KOHEI
• Format: Patent
• Language: English
• Published: 04.11.2010
• Subjects: CHEMICAL SURFACE TREATMENT; CHEMISTRY; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; COATING MATERIAL WITH METALLIC MATERIAL; COATING METALLIC MATERIAL; DIFFUSION TREATMENT OF METALLIC MATERIAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL; METALLURGY; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION

PROBLEM TO BE SOLVED: To provide an organic composite Mg based plated steel sheet solving a corrosion problem under coating film of a crack part conventionally existing in a plated steel sheet for automobile. SOLUTION: The organic composite Mg based plated steel sheet is provided, wherein a Mg based plated film containing 30 to 85 atom% Mg, 0.03 to 10 atom% Ca and the rest constituted of Zn and/or Al and inevitable impurities is formed on at least one surface of a steel sheet; a Zn phosphate film of 0.3 to 10 g/m2is formed on the surface of the Mg based plated film and an organic film is formed on at least one surface of the Zn phosphate film; the Zn phosphate film contains 20 to 250 mg/m2Mg; and Mg/P (mass ratio) in the Zn phosphate film is 0.15 to 0.35. COPYRIGHT: (C)2011,JPO&INPIT