PRODUCTION OF ELECTROLYTIC CHROMIC ACID TREATED STEEL SHEET FOR ADHERED CAN BY FLUORIDE COMPOUND BATH

PURPOSE:To obtain an electrolytic chromic acid treated steel sheet for adhered can having excellent surface characteristics by regulating the concn. of free fluorine in a plating soln. consisting essentially of chromic anhydride and a fluorine compd., and the ratio among the free fluorine, total flu...

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Bibliographic Details
Main Authors IWAMOTO MORIO, OOYAMA CHIYOUSHICHIROU, ONODA TAMOTSU, OOYAGI YASHICHI
Format Patent
LanguageEnglish
Published 26.12.1983
Subjects
APPARATUS THEREFOR
CHEMISTRY
ELECTROFORMING
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES
METALLURGY
PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS
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Summary:PURPOSE:To obtain an electrolytic chromic acid treated steel sheet for adhered can having excellent surface characteristics by regulating the concn. of free fluorine in a plating soln. consisting essentially of chromic anhydride and a fluorine compd., and the ratio among the free fluorine, total fluorine and sulfate group. CONSTITUTION:A steel sheet is subjected to a cathodic electrolyzing treatment in a plating bath contg. <=0.2g/l sulfuric acid group and chromic anhydride and a fluorine compd. while regulating the concn. of the free fluorine in the bath at >=0.15g/l, the ratio of the free fluorine/total fluorine at >=0.05, and the ratio of the free fluorine/sulfate group at >=2.0. The electrolytic chromic acid treated steel sheet having metallic chromium on the lower layer and chromium oxide on the upper layer is obtd. by the electrolytic treatment. The electrolytic chromic acid treated steel sheet for adhered cans which withstands high temp. packing and pasteurization and has good adhesive characteristics and excellent surface quality characteristics is obtained by the above-mentioned bath control.
Bibliography:Application Number: JP19820107731