HOT-DIP GALVANIZED STEEL SHEET AND MANUFACTURING METHOD THEREFOR

The present invention provides a method for producing a hot-dip galvanized steel sheet having a uniform surface appearance, excellent conductivity and corrosion resistance, and a chromate-free surface treatment coating film. A method of producing a hot-dip galvanized steel sheet includes applying, t...

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Bibliographische Detailangaben
Hauptverfasser:	KANEKO, Rie, FUJIBAYASHI, Nobue, KUBOTA, Takahiro
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	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 LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM METALLURGY PERFORMING OPERATIONS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING
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Beschreibung
Zusammenfassung:	The present invention provides a method for producing a hot-dip galvanized steel sheet having a uniform surface appearance, excellent conductivity and corrosion resistance, and a chromate-free surface treatment coating film. A method of producing a hot-dip galvanized steel sheet includes applying, to a hot-dip galvanized steel sheet having a Ra of 0.5 to 2.0 µm and a PPI of 150 or more, a predetermined surface treatment agent, i.e., a surface treatment agent containing a specified resin compound, a specified urethane resin having cationy, a specified silane coupling agent having a functional group, a specified organic Ti chelate compound, and a tetravalent vanadyl compound at a specified ratio; and drying the surface treatment agent at a ultimate sheet temperature of 50°C to 180°C to form a surface treatment coating film with a coating weight of 0.2 to 1.0 g/m 2 on the surface of the steel sheet.