Method for removing metal stains from a metal surface

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United States of America Patent

PATENT NO 11982004
APP PUB NO 20230085240A1
SERIAL NO

17800239

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Abstract

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The invention relates to a method for removing and/or decolourizing metal stains on a surface of a substrate composed of aluminium or aluminium alloy, the method comprising the consecutive steps of (a) providing the substrate comprising metal stains on the surface, said metal stains having a metal stain surface area; (b) providing an aqueous treatment liquid comprising one or more components selected from the group consisting of galactaric acid and galactarate salts; and (c) treating at least part of the surface of the substrate by contacting at least part of the metal stain surface area with the aqueous treatment liquid, wherein the aqueous treatment liquid is free of phosphorus- and/or acrylate-containing compounds and wherein the pH of the aqueous treatment liquid is between 6.5 and 10.9. The invention further concerns the resulting products and the use of the aqueous treatment liquid for removing and/or decolourizing metal stains on a surface of a substrate composed of aluminium or aluminium alloy.

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Patent Owner(s)

Patent OwnerAddress
COOPERATIE KONINKLIJKE COSUN U A4814 NE BREDA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Lazeroms, Robert Sprundel, NL 3 0
Vaders, Johanna Elisabet Nelke Houten, NL 1 0

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