METHOD FOR PASSIVATION OF THE SURFACE OF BLACKPLATE OR TINPLATE AND ELECTROLYSIS SYSTEM FOR PERFORMANCE OF THE METHOD
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United States of America Patent
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Oct 15, 2020
app pub date -
Apr 6, 2020
filing date -
Apr 9, 2019
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Abstract
A method for passivation of the surface of blackplate or tinplate by electrolytic deposition of a chromium oxide-containing passivation layer on the surface. The electrolytic deposition of the chromium-containing passivation layer occurs from an electrolyte solution that contains a trivalent chromium compound as well as at least one salt to increase the conductivity and at least one acid or a base to adjust a desired pH value. The electrolyte solution contains no additional components apart from the trivalent chromium compound as well as the at least one salt and the at least one acid or base and is especially free of organic complexing agents and free of buffering agents.
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