ZN-FE ALLOY PLATED STEEL SHEET HAVING SUPERIOR SUITABILITY TO COATING BY ELECTRODEPOSITION

PURPOSE:To obtain a surface-treated steel sheet having superior suitability to coating by electrodeposition and superior corrosion resistance at the damaged part of a coating film by plating at least one side of a steel sheet with a Zn-Fe alloy and forming a plasma-modified layer in the surface of t...

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Bibliographische Detailangaben
Hauptverfasser:	SAKOTA AKITO, HOSODA YASUSHI
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 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 MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain a surface-treated steel sheet having superior suitability to coating by electrodeposition and superior corrosion resistance at the damaged part of a coating film by plating at least one side of a steel sheet with a Zn-Fe alloy and forming a plasma-modified layer in the surface of the resulting plating layer. CONSTITUTION:A plating layer of a Zn-Fe alloy contg. 5-30wt.% Fe is formed on at least one side of a steel sheet and this plated steel sheet 4 is set on a sample holder 5 in a vacuum chamber 2 with the plated side upward. Gaseous Ar is introduced into the chamber 2 from a gas feeding pipe 1 to form an atmosphere of Ar under reduced pressure. High voltage is then impressed between the chamber 2 as the anode and the plated steel sheet 4 as the cathode with a DC power source 7 and DC glow discharge is caused on the Zn-Fe alloy plated side or high-temp. plasma is brought into contact with the plated side to dezincify the Zn-Fe alloy plating layer. A modified Fe-Zn alloy plating layer having a very high Fe content is formed and a steel sheet for an automobile having superior suitability to coating by electrodeposition, superior corrosion resistance at the damaged part of a coating film formed by electrodeposition and superior workability is produced.