SURFACE-TREATED STEEL SHEET FOR SEAM WELDING CAN HAVING EXCELLENT WELDABILITY

PURPOSE:To provide a titled surface-treated steel sheet provided with corrosion resistance and adhesion of a coated film after painting by forming adequately a metallic tin layer having many projecting parts on the surface and forming further an adequate chromate film layer thereon. CONSTITUTION:A m...

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Bibliographische Detailangaben
Hauptverfasser:	YAMAJI KIYOUKO, NAKAKOUJI NAOMASA, ICHIDA TOSHIROU, MOCHIZUKI KAZUO, OGATA HAJIME
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 provide a titled surface-treated steel sheet provided with corrosion resistance and adhesion of a coated film after painting by forming adequately a metallic tin layer having many projecting parts on the surface and forming further an adequate chromate film layer thereon. CONSTITUTION:A metallic tin layer having many projecting parts is formed on the surface of a degreased and pickled steel sheet and is so adjusted that the area of the respective projecting parts mentioned above is 1-800,000mum , the area per cent occupied by the projecting parts is 20-80% and the thickness of the metallic tin in the projecting parts is 0.007-0.70mum. A chromate film layer consisting of chromium oxide hydrate or metallic chromium and chromium oxide hydrate is formed on the top layer of said metallic tin and is so adjusted that the total chromium weight in the chromate coating layer is