MANUFACTURE OF SURFACE-TREATED STEEL SHEET EXCELLENT IN RUST RESISTANCE AND WELDABILITY

PURPOSE:To manufacture a surface-treated steel sheet excellent in rust resistance and weldability, by forming, in order, an Ni-plating layer, a galvanizing layer, and an Sn-plating layer on the surface of a low-carbon cold-rolled steel sheet and then applying treatment at a specific temp. so as to f...

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Bibliographische Detailangaben
Hauptverfasser:	EZURE KAZUYA, WAKE RYOSUKE
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR 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 ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	PURPOSE:To manufacture a surface-treated steel sheet excellent in rust resistance and weldability, by forming, in order, an Ni-plating layer, a galvanizing layer, and an Sn-plating layer on the surface of a low-carbon cold-rolled steel sheet and then applying treatment at a specific temp. so as to form alloy layers composed of respective plating layers. CONSTITUTION:On the surface of a low-carbon cold-rolled steel sheet, in order from the steel-sheet side, Ni stable in various corrosive environments is plated in an amount of 0.1-5.0g/m , and, on this layer, Zn excellent in rust resistance is plated in an amount of 0.05-1.5g/m , and further on the above layer, Sn excellent in weldability, surface color tone, and luster is plated in an amount of 0.05-2.8g/m . Subsequently, this plated sheet is heated up to >=200 deg.C by means of resistance heating, induction heating, etc., to alloy respective plating layers, so that layers of Zn-Ni alloy and Sn-Zn alloy, or layers of Zn-Ni alloy and Sn-Zn-Ni alloy, or layers of Zn-Ni alloy and Sn-Zn-Ni alloy and Sn-Zn alloy, or layers of Sn-Zn-Ni alloy and Sn-Zn alloy are formed on an Ni- plating layer, respectively. In this way, the surface-treated steel sheet excellent in rust resistance, seam weldability, and resistance to painting corrosion can be obtained.