MANUFACTURE OF TIN-FREE STEEL HAVING SUPERIOR ADHESIVE STRENGTH TO PAINT

PURPOSE:To accelerate the growth of a chromium oxide hydrate coating without deteriorating the superior adhesive strength by combinedly adding very small amounts of fluorine ions and chlorine ions to an electrolytic chromating bath. CONSTITUTION:A steel sheet is plated with Cr by cathodic electrolys...

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Hauptverfasser:	TSUGAWA SHIYUNICHI, YAMAJI KIYOUKO, ICHIDA TOSHIROU, IRIE TOSHIO, 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 accelerate the growth of a chromium oxide hydrate coating without deteriorating the superior adhesive strength by combinedly adding very small amounts of fluorine ions and chlorine ions to an electrolytic chromating bath. CONSTITUTION:A steel sheet is plated with Cr by cathodic electrolysis in an aqueous soln. contg. Cr, and the Cr plated steel sheet is anodically treated in an aqueous soln. contg. Cr. The reversely electrolyzed steel sheet is electrolytically chromated in an aqueous soln. contg. one or more kinds of compounds selected among chromic anhydride, chromates and dichromates as principal components to manufacture tin-free steel. At this time, very small amounts of fluorine ions and chlorine ions are added to the electrolytic chromating bath so as to satisfy the equations (where x is the molar ratio of F/Cr, and y is the molar ratio of Cl/Cr).