PRODUCTION OF TIN-FREE STEEL PLATE

PURPOSE:To obtain a Cr film which has a uniform film construction and good resistance to a retort treatment in the stage of applying an electrolytic chromic acid treatment on a steel plate, by using an aq. chromic acid soln. which contains no assistants except unavoidable impurities and controlling...

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Hauptverfasser:	TSUGAWA SHIYUNICHI, ICHIDA TOSHIROU, HARADA SHIYUNICHI, KOBAYASHI HIDEO, OGATA HAJIME
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 obtain a Cr film which has a uniform film construction and good resistance to a retort treatment in the stage of applying an electrolytic chromic acid treatment on a steel plate, by using an aq. chromic acid soln. which contains no assistants except unavoidable impurities and controlling the bath thereof to specific pH or below. CONSTITUTION:Cr plating is applied on a steel plate in a Cr plating bath, whereafter the steel plate is reversely electrolyzed in the Cr plating bath to elute part of the hydroxidized film of Cr formed in the stage of the Cr plating and the anions of the assistant codeposited on the hydroxidized film of Cr. The steel plate is then thoroughly rinsed in a rinsing bath. Further the steel plate is subjected to cathodic treatment at =1 kind among chromate and dichromate as a base component, contg. anion of the unavoidable impurity occuring in the base component and being not added with any assistant.