PRODUCTION OF ZN ALLOY ELECTROPLATED STEEL SHEET HAVING SUPERIOR CHEMICAL TREATABILITY AND CORROSION RESISTANCE

PURPOSE:To produce a Zn alloy electroplated steel sheet having superior chemical treatability and corrosion resistance by successively subjecting a steel sheet to Zn alloy electroplating with a plating soln., nonelectrolytic immersion in the plating soln., washing and anodic electrolysis. CONSTITUTI...

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Hauptverfasser:	YONEZAWA KAZUMA, TAKASAKI ISAMU, HONJO TORU, KOBAYASHI SHIGERU
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS THEREFOR CHEMISTRY ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES METALLURGY PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROMOBJECTS
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Zusammenfassung:	PURPOSE:To produce a Zn alloy electroplated steel sheet having superior chemical treatability and corrosion resistance by successively subjecting a steel sheet to Zn alloy electroplating with a plating soln., nonelectrolytic immersion in the plating soln., washing and anodic electrolysis. CONSTITUTION:A steel sheet is pretreated and electroplated by cathodic electrolysis with a prescribed electrolytic soln. to deposit a prescribed amt. of a Zn alloy contg. a prescribed amt. of an alloying element. The electroplated steel sheet is nonelectrolytically immersed in the electrolytic soln. at about 0.5-2.5pH for about 3-20sec, taken out, washed and anodically electrolyzed under the conditions of about 1-150A/dm current density, about 5-500C/dm quantity of electricity and about >=4pH. The steel sheet is then washed and dried. A Zn alloy electroplated steel sheet having superior chemical treatability is obtd. without deteriorating corrosion resistance.