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

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United States of America Patent

PATENT NO 11447884
APP PUB NO 20210348291A1
SERIAL NO

17284902

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Abstract

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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 comprising trivalent 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.

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Patent Owner(s)

Patent OwnerAddress
ATOTECH DEUTSCHLAND GMBH & CO KG10553 BERLIN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Foong, Tse-Cheen Berlin, DE 2 0
Kurtz, Olaf Berlin, DE 15 99
Rüther, Robert Berlin, DE 8 10
Setyadi-Lie, Joko Berlin, DE 2 0

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