Chemetall GmbH

Germany

Chemetall GmbH

Germany
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The invention relates to a process for coating metallic surfaces of substrates with aqueous compositions, also called coating compositions hereinafter, in the form of a dispersion and/or suspension which contains at least one stabilized binder and a gel former and forms a coating based on an ionic gel with the cations leached out of the metallic surface in a pretreatment stage and/or during the contacting, in which the coating is effected by: I. providing a substrate with a cleaned metallic surface, II. contacting and coating metallic surfaces with a first aqueous composition in the form of dispersion and/or suspension, III. optionally rinsing the organic coating, IV. optionally drying the organic coating and V. coating with at least one further coating composition prior to drying and crosslinking all the layers applied, where the stabilized binders must fulfill the condition that a) an aqueous mixture of demineralized water, 0.2% to 2% by weight of the gel former and 5% to 20% by weight of the stabilized binder; b) is adjusted to a pH of 1 to 7; c) a cleaned substrate is dipped into the mixture according to b) at room temperature for at least 1 minute and d) a check is made as to whether an organic coating of at least 1 m has been deposited, wherein e) a test is additionally conducted without gel former, in which a mixture of demineralized water and 5% to 20% by weight of the dispersion to be examined is produced; f) the mixture produced in e) is likewise adjusted to a pH of 1 to 7 and g) the test described in c) and d) is repeated.


The invention relates to a method for coating surfaces, to a corresponding coating, and to the use of the objects coated in accordance with said method. In accordance with the invention the object is achieved by a method for coating metallic surfaces of substrates that comprises or consists of the following steps: I) providing a substrate having a cleaned metallic surface, II) contacting and coating metallic surfaces with an aqueous composition in dispersion and/or suspension form, III) optionally rinsing the organic coating, and IV) drying and/or baking the organic coating or V) optionally drying the organic coating and coating it with a similar or further coating composition prior to drying and/or baking, characterized in that the coating in step II is carried out with an aqueous composition in dispersion and/or suspension form that comprises a complex fluoride, and at least one anionic polyelectrolyte is added to a nonionically or anionicallyonionically stabilized dispersion of film-forming polymers and/or to a suspension of film-forming inorganic particles and a coating forms that is based on an ionogenic gel comprising cations dissolved out of the metallic surface.


The invention relates to a method for coating surfaces, to a corresponding coating, and to the use of the objects coated in accordance with said method. In accordance with the invention the object is achieved by a method for coating metallic surfaces of substrates that comprises or consists of the following steps: I) providing a substrate having a cleaned metallic surface, II) contacting and coating metallic surfaces with an aqueous composition in dispersion and/or suspension form, III) optionally rinsing the organic coating, and IV) drying and/or baking the organic coating or V) optionally drying the organic coating and coating it with a similar or further coating composition prior to drying and/or baking, characterized in that the coating in step II is carried out with an aqueous composition in dispersion and/or suspension form that comprises a complex fluoride, and at least one anionic polyelectrolyte is added to a nonionically or anionically/nonionically stabilized dispersion of film-forming polymers and/or to a suspension of film-forming inorganic particles and a coating forms that is based on an ionogenic gel comprising cations dissolved out of the metallic surface.


A method for coating metallic surfaces of substrates with surfaces of aqueous coating) compositions in the form of a dispersion and/or a suspension containing at least one stabilized binder and a gelling agent, the cations having been dissolved out of the metallic surface of the substrate in a pretreatment stage and/or during the contacting. The invention further relates to such a coating based on an ionogenic gel, in which the coating is formed by a process further described herein.


The invention relates to a method for producing a sandwich structure on the basis of at least one layer on the basis of metallic material and on the basis of at least one layer of organic polymer, wherein for coating of at least one metallic surface with at least one metallic layer to be combined with the layer on the basis of organic polymer, an aqueous conversion composition on the basis of zinc, additional cations, poly(acrylic acid), and optionally silane, is brought into contact, wherein the liquid film thereby produced is dried on and wherein the metallic layer coated in such manner is brought into contact with at least one layer on the basis of organic polymer and is combined into a sandwich structure by means of compaction under pressure and/or temperature. The invention also relates to such sandwich structures.


Patent
Chemetall GmbH | Date: 2015-06-16

The invention relates to a detergent for gentle removal of inks as used for marking in a roll mill, and to markers as used in production for temporary marking. According to the invention, the problem is solved by a detergent which permits the gentle removal of inks or markers from metallic surfaces in the form of a concentrate or a cleaning bath solution containing at least one water-immiscible solvent in an amount of 4 to 200 g/l, at least one anionic and/or nonionic surfactant in an amount of 8-300 g/l, at least one complexing agent in an amount of 1-100 g/l, at least one buffer substance in an amount of 1-100 g/1 and at least one water-miscible solvent in an amount of 4-200 g/1 in water.


The invention relates to a method for producing a sandwich structure on the basis of at least one layer on the basis of metallic material and on the basis of at least one layer of organic polymer, wherein for coating of at least one metallic surface with at least one metallic layer to be combined with the layer on the basis of organic polymer, an aqueous conversion composition on the basis of zinc, additional cations, poly(acrylic acid), and optionally silane, is brought into contact, wherein the liquid film thereby produced is dried on and wherein the metallic layer coated in such manner is brought into contact with at least one layer on the basis of organic polymer and is combined into a sandwich structure by means of compaction under pressure and/or temperature. The invention also relates to such sandwich structures.


Patent
Chemetall GmbH | Date: 2017-04-26

The invention relates to a detergent for gentle removal of inks as used for marking in a roll mill, and to markers as used in production for temporary marking. According to the invention, the problem is solved by a detergent which permits the gentle removal of inks or markers from metallic surfaces in the form of a concentrate or a cleaning bath solution containing at least one water-immiscible solvent in an amount of 4 to 200 g/l, at least one anionic and/or nonionic surfactant in an amount of 8-300 g/l, at least one complexing agent in an amount of 1-100 g/l, at least one buffer substance in an amount of 1-100 g/l and at least one water-miscible solvent in an amount of 4-200 g/l in water.


Patent
Chemetall GmbH | Date: 2015-08-19

An object of the present invention is to provide a surface treatment agent and a surface treatment method capable of imparting excellent corrosion resistance while enhancing adhesion between a surface of a metal substrate and a resin-containing layer. Disclosed is a surface treatment agent for treating a surface of a metal substrate, comprising: an acrylic resin having a carboxyl group and a hydroxyl group, an oxazoline group-containing compound and metal particles, wherein the metal particles are particles containing at least one metal selected from the group consisting of Nb, Ca and Nd. The metal particles are preferably in the form of a niobium oxide sol.


A method for the electroless coating of surfaces of articles and particles with a multiplicity of inorganic and organic water-insoluble particles to form a substantially flush-resistant layer of high particle density, in which the particles are applied to the surfaces to be coated in an aqueous composition that can be stabilized or is stable, in the form of a dispersion, and are applied to the surface to be coated substantially or predominantly by electrostatic forces and are applied to and secured on the surfaces to be coated substantially or predominantly by electrostatic forces. The surfaces to be coated are first activated by an activating agent, wherein an activation layer with charges is formed by the activating agent on the surfaces to be coated.

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