Method for electrolytically passivating a surface of silver, silver alloy, gold, or gold alloy

The present invention relates to an aqueous passivation solution having a pH in the range from 5.4 to 7.2, the solution includingtrivalent chromium ions, andformate anions and/or oxalate anions as complexing agents for said trivalent chromium ions, in which the trivalent chromium ions with respect t...

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Bibliographic Details
Main Authors Rüther, Robert, Kurtz, Olaf, Foong, Tse-Cheen, Setyadi-Lie, Joko
Format Patent
LanguageEnglish
Published 26.12.2023
Subjects
APPARATUS THEREFOR
CHEMISTRY
ELECTROFORMING
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES
METALLURGY
PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS
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Summary:The present invention relates to an aqueous passivation solution having a pH in the range from 5.4 to 7.2, the solution includingtrivalent chromium ions, andformate anions and/or oxalate anions as complexing agents for said trivalent chromium ions, in which the trivalent chromium ions with respect to all formate anions together with all oxalate anions form a molar ratio in the range from 1:15 to 1:400.
Bibliography:Application Number: US202217888160