METHOD FOR MANUFACTURING SURFACE-TREATED STEEL SHEET

PROBLEM TO BE SOLVED: To provide a method for manufacturing a surface-treated steel sheet having adequate corrosion resistance and blackening resistance without performing a complicated manufacturing process. SOLUTION: This manufacturing method includes: bringing a surface of an Zn-Al-base plated st...

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Hauptverfasser:	IMOKAWA TORU, FUJIBAYASHI NOBUE
Format:	Patent
Sprache:	eng
Schlagworte:	APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL 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 PERFORMING OPERATIONS PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL SPRAYING OR ATOMISING IN GENERAL SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a method for manufacturing a surface-treated steel sheet having adequate corrosion resistance and blackening resistance without performing a complicated manufacturing process. SOLUTION: This manufacturing method includes: bringing a surface of an Zn-Al-base plated steel sheet which contains 3-7 mass% Al into contact with an acidic aqueous solution which has a pH of 1.5-4.0 and contains nitrate ions that include HNO3, KNO3, NaNO3, Ca(NO3)2or NH4NO3as an ion source; rinsing and drying the surface; and then forming a chromate-free chemical conversion coating on the resultant surface of the plated steel sheet. COPYRIGHT: (C)2011,JPO&INPIT