MANUFACTURE OF ELECTROLYTICALLY CHROMATE-TREATED STEEL PLATE WITH HIGH ADHESION

PURPOSE:To enhance the adhesion of a steel plate by cathodically electrolyzing the plate in a bath contg. specified amounts of chromic anhydride, sulfate ions and a mixture of different 2 kinds of fluorine compounds. CONSTITUTION:An electrolytic bath is provided with a composition contg. 40- 120g/l...

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Bibliographic Details
Main Authors NOMURA YUKIO, OOYAGI YASHICHI, MIYAKE NORITSUGU, HATA TERU
Format Patent
LanguageEnglish
Published 14.08.1982
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 enhance the adhesion of a steel plate by cathodically electrolyzing the plate in a bath contg. specified amounts of chromic anhydride, sulfate ions and a mixture of different 2 kinds of fluorine compounds. CONSTITUTION:An electrolytic bath is provided with a composition contg. 40- 120g/l chromic anhydride, 0.04-0.2% sulfate ions and 3-7wt% mixture of 1 or >= 2 kinds of fluorine compounds selected from a group A consisting of HF, NaF, KF, NH4F, NaHF2 KHF2 and MNH4HF2 with 1 or >=2 kinds of fluorine compounds selected from a group B consisting of H2SiF6, NaSiF6, K2SiF4, (NH4)2Si F6, HBF4, NaBF4, KBF4 and NH4BF4 to the amount of chromic anhydride. A steel plate is cathodically electrolyzed in the electrolytic bath, and it may be further electrolyzed in a chromic acid compound of >=4pH.
Bibliography:Application Number: JP19810016872