SURFACE-TREATED STEEL SHEET

PURPOSE:To prevent the generation of overetching at the time of a phosphate chemical conversion treatment by electroplating Zn on the surface of a steel sheet, then coating a Zn alloy contg. at least one kind of Fe group metals and Mn and Pb thereon. CONSTITUTION:After the Zn is electroplated on the...

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Bibliographische Detailangaben
Hauptverfasser:	YONEZAWA KAZUMA, HONJO TORU
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR CHEMISTRY ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES METALLURGY PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS
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Beschreibung
Zusammenfassung:	PURPOSE:To prevent the generation of overetching at the time of a phosphate chemical conversion treatment by electroplating Zn on the surface of a steel sheet, then coating a Zn alloy contg. at least one kind of Fe group metals and Mn and Pb thereon. CONSTITUTION:After the Zn is electroplated on the surface of the steel sheet, the Zn alloy contg. 0.01-5wt.% at least one kind of the metal selected from the group Fe elements including Ni, Co, Fe, etc., and Mn and =gg/m coating weight. The overetching is not generated even if the steel sheet is subjected to the surface treatment by a phosphate chemical conversion treatment liquid having high reactivity and the surface-treated steel sheet having excellent plating adhesiveness and corrosion resistance is obtd.