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.

This disclosure relates to a cleaning composition that contains 1) hydroxylamine; 2) a chelating agent; 3) an alkylene glycol; and 4) water. This disclosure also relates to a method of using the above composition for cleaning a semiconductor substrate.

This disclosure relates to a cleaning composition that contains 1) hydroxylamine; 2) a chelating agent; 3) an alkylene glycol; and 4) water. This disclosure also relates to a method of using the above composition for cleaning a semiconductor substrate.

The present invention relates to a method for substantially nickel-free phosphating of a metallic surface, wherein a metallic surface is treated one after the other with the following compositions: i) with an alkaline, aqueous cleaner composition which comprises at least one water-soluble silicate, and ii) with an acidic, aqueous, substantially nickel-free phosphating composition which comprises zinc ions, manganese ions and phosphate ions. The invention also relates to the above cleaner composition itself and also to a metallic surface phosphate-coated by the above method, and to the use of said surface.

The present invention relates to a method for substantially nickel-free phosphating of a metallic surface, wherein a metallic surface is treated one after the other with the following compositions: i) with an alkaline, aqueous cleaner composition which comprises at least one water-soluble silicate, and ii) with an acidic, aqueous, substantially nickel-free phosphating composition which comprises zinc ions, manganese ions and phosphate ions. The invention also relates to the above cleaner composition itself and also to a metallic surface phosphate-coated by the above method, and to the use of said surface.

The demulsifying cleaning of metallic surfaces which may be contaminated with oil(s) with at least one further nonpolar organic compound, with fat(s), with soap(s), with particulate dirt or with at least one anionic organic compound using an aqueous, alkaline, surfactant-containing bath solutions.

The demulsifying cleaning of metallic surfaces which may be contaminated with oil(s) with at least one further nonpolar organic compound, with fat(s), with soap(s), with particulate dirt or with at least one anionic organic compound using an aqueous, alkaline, surfactant-containing bath solutions.

A solution is provided and includes a strong base, a corrosion inhibitor, wherein the strong base is an alkali metal hydroxide, wherein the corrosion inhibitor is at least one of an organic acid having a-COOH functional group or an alkali metal salt of one of an organic acid having a-COOH functional group.

A solution is provided includes a strong base, a corrosion inhibitor, wherein the strong base is an alkali metal hydroxide, wherein the corrosion inhibitor is at least one of an organic acid having a-COOH functional group or an alkali metal salt of one of an organic acid having a-COOH functional group.

Described herein is a water-based, alkaline cleaner concentrate for producing a cleaner for metallic surfaces, the concentrate including a) at least one (meth)acrylic acid homopolymer having a weight-average molar mass in the range from 3 000 to 19 000 g/mol and b) at least one (meth)acrylic acid copolymer having a weight-average molar mass in the range from 50 000 to 100 000 g/mol. Also described herein are a corresponding cleaner for metallic surfaces with reduced pickling erosion, a process for anticorrosive treatment of metallic surfaces that includes a corresponding cleaning step, a metallic surface obtained by the process, and a method of use thereof in the sector of the metalworking industries.