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

A method for electrolytically passivating a surface of silver, silver alloy, gold, or gold alloy, the method comprising the steps of(i) providing a substrate comprising the surface,(ii) providing an aqueous passivation solution comprisingtrivalent chromium ions, andone or more than one species of ca...

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Bibliographic Details
Main Authors Rüther, Robert, Kurtz, Olaf, Foong, Tse-Cheen, Setyadi-Lie, Joko
Format Patent
LanguageEnglish
Published 20.09.2022
Subjects
APPARATUS THEREFOR
CHEMISTRY
ELECTROFORMING
ELECTROLYTIC OR ELECTROPHORETIC PROCESSES
METALLURGY
PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS
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Summary:A method for electrolytically passivating a surface of silver, silver alloy, gold, or gold alloy, the method comprising the steps of(i) providing a substrate comprising the surface,(ii) providing an aqueous passivation solution comprisingtrivalent chromium ions, andone or more than one species of carboxylic acid residue anions,(iii) contacting the substrate with the passivation solution and passing an electrical current between the substrate as a cathode and an anode such that a passivation layer is electrolytically deposited onto the surface,wherein the trivalent chromium ions with respect to all species of carboxylic acid residue anions form a molar ratio in the range from 1:10 to 1:400.
Bibliography:Application Number: US201917284902