Chemetall Gmbh

Rhodia Operations

Manfred Walter

Thomas Kolberg

Mats Eriksson

Peter Schubach

Lars Sebralla

Olaf Dahlenburg

Marie-Pierre Labeau

Nawel Souad Khelfallah

Norbert Kliehm

Guillaume Gody

Kevin Brown

Christian Jung

Carola Komp

Stefan Birkenheuer

Eckart Schoenfelder

Eckart Schönfelder

Axel Schöne

Karl-Heinz Bischoff

Markus Wahren

Michael Dröge

Sean M Wetterer

Thomas Willumeit

Korneel Demeyere

The present invention relates to an acidic aqueous composition for coating metallic surfaces, particularly of aluminium materials, that comprises, besides water and optionally further components, a) at least one compound selected from the group consisting of organoalkoxysilanes, organosilanols, polyorganosilanols, organosiloxanes and polyorganosiloxanes, b) at least one compound selected from the group consisting of titanium, zirconium, hafnium and aluminium compounds and silicon complex fluoride, and c) at least one copolymer which is stable at least in a segment of the pH range below 6 and which comprises, in alternating configuration, monomer units containing at least one carboxylic and/or phosphonic acid group and monomer units containing no acid group. The invention further relates to a corresponding coating method and to the use of the substrates coated by this method.

Composition for coating of metallic surfaces with good adhesion, in particular aluminum materials

Provided herein is a method for pretreating aluminum materials, particularly aluminum wheels, wherein an aluminum material is successively i) cleaned and subsequently rinsed, ii) optionally subjected to alkaline pickling and subsequently rinsed, iii) optionally contacted with an aqueous composition comprising at least one mineral acid, iv) optionally rinsed and v) contacted with an acidic aqueous composition comprising a) at least one compound selected from the group consisting of titanium, zirconium and hafnium compounds and b) at least one linear terpolymer prepared by controlled radical polymerisation and comprising vinylphosphonic acid monomeric units, hydroxylethyl- and/or hydroxylpropyl-(meth)acrylate monomeric units and (meth)acrylic acid monomeric units, vi) optionally rinsed, vii) optionally contacted with another aqueous composition, viii) optionally rinsed and ix) optionally dried. Further provided herein is a corresponding composition as well as the use of the materials treated according to the method.

Method for pretreating aluminum materials, particularly aluminum wheels

The invention relates to a process for coating metallic surfaces with a composition containing silane/silanol/siloxane/polysiloxane, wherein, in addition to The invention further relates to corresponding aqueous compositions.

Process for coating metallic surfaces with a multicomponent aqueous composition

A method for coating metallic surfaces with aqueous compositions, wherein a silane-based aqueous composition containing at least one silane and/or a related silicon-containing compound and optionally additional components is treated further, for example, at temperatures above 70&#xb0; C., in a pretreatment step without drying the coating, by using at least one aqueous rinse step after this pretreatment step and then performing an electrodeposition coating, in which at least one surfactant is added at least in the last rinse step of the aqueous rinse steps. Coated metallic surfaces are also described.

Method for coating metallic surfaces with a multi-component aqueous composition

The invention relates to a process for coating metallic surfaces with a composition containing at least one of a silane, silanol, siloxane or polysiloxane that is capable of condensation, water and optionally an organic solvent. The composition also contains compound containing Ti, Hf, Zr, Al or B; and at least one type of cation or an organic compound d) selected from monomers, oligomers, polymers, copolymers and block copolymers. The coating freshly applied with this composition is rinsed with a fluid and is not dried thoroughly before this rinsing step so that the compound capable of condensation does not condense substantially before the rinsing step.

Method for coating metallic surfaces with an aqueous composition

A method for coating metal surfaces, in particular surfaces of wheels made of an aluminum alloy, in a multi-step method, wherein the metallic surfaces are first contacted with an aqueous composition predominantly containing silane/silanol/siloxane/polysiloxane and thereafter contacted with an aqueous composition predominantly containing at least one phosphonic compound.

Method for coating metal surfaces in a multi-step method

This invention relates to a method for phosphating metal surfaces in which the metal surfaces are treated with an aqueous phosphate and titanium-based colloidal activating agent prior to phoshating, wherein the activating agent comprises at least one water-soluble silicon compound having at least one organic group. The invention also relates to a corresponding activating agent.

Method for coating metal surfaces with an activating agent prior to phosphating

A process for producing a repair coating on at least one metallic surface that is coated with at least one corrosion protection coating A applied with at least one composition selected from the group of pretreatment compositions, of organic compositions and of silicon compound(s) containing compositions, whereby the at least one corrosion protecting coating A has been at least partially removed in the area Z, whereby a thin corrosion protecting coating B containing at least one silicon compound is applied with a solution or dispersion containing at least one silane, at least one silanol, at least one siloxane, at least one polysiloxane or any mixture of these (='siloxane composition') on at least a part of the area Z. Optionally, a further corrosion protecting coating C may he applied on the thin corrosion protecting coating B generated with the siloxane composition whereby the at least one further corrosion protecting coating C is generated with at least one organic composition like a primer, a wet-primer, an e-coat, a powder coat, a base-coat or a clear-coat or with at least one composition which is the same or another siloxane composition as for the thin film B.

Process for producing a repair coating on a coated metallic surface

A process for producing a repair coating on at least one metallic surface that is coated with at least one corrosion protecting coating A applied with at least one composition selected from the group of pretreatment compositions, of organic compositions and of silicon compound(s) containing compositions, whereby the at least one corrosion protecting coating A has been at least partially removed in the area Z, whereby a thin corrosion protecting coating B containing at least one silicon compound is applied with a solution or dispersion containing a silane, a silanol, a siloxane, or a polysiloxane on at least a part of the area Z. A further corrosion protecting coating C may be applied.

A method for coating a metallic surface with an aqueous composition for pretreating before applying another coating or for treating said metallic surfaces. The method is characterized in that the composition contains, in addition to water; a) at least one hydrolyzable or at least partially hydrolyzed fluorine-free silane, and; b) at least one hydrolyzable or at least partially hydrolyzed fluorine-containing silane. The invention also relates to corresponding compositions.

Method for coating metallic surfaces with a mixture containing at least two silanes

A tool and a process for producing a repair coating on at least one metallic surface that is coated with at least one corrosion protecting coating A applied with at least one composition selected from the group of pretreatment compositions, of organic compositions and of silicon compound(s) containing compositions. Corrosion protecting coating A has been at least partially removed in area Z. Corrosion protecting coating B contains a silicon compound and is applied as a solution or dispersion containing a silane, a silanol, a siloxane, a polysiloxane or mixture thereof on at least a part of the area Z. A further corrosion protecting coating C may be applied. The tool is provided for use in the process.

Tool for the application of a repair coating to a metallic surface

A composition and a method for coating metallic surfaces with a silane/silanol/siloxane/polysiloxane-containing composition, whereby the composition contains a) at least one compound selected from the silanes, silanols, siloxanes and polysiloxanes, b) at least two compounds selected from titanium-, hafnium-, zirconium-, aluminum- or boron-containing compounds, optionally c) at least one type of cation selected from cations of metals of the 1to 3and 5to 8sub-groups including the lanthanides and the 2main group of the periodic table of the elements or at least one corresponding compound, d) at least one organic compound selected from monomers, oligomers, polymers, copolymers and block copolymers or e) at least one substance affecting the pH value, water and optionally at least one organic solvent.

Process for coating metallic surfaces with an aqueous composition, and this composition

A process for producing a repair coating on a metallic surface coated with a corrosion protecting coating A applied with a pretreatment composition, an organic composition or a silicon compound containing composition. Corrosion protecting coating A has been at least partially removed in the area Z, and a thin corrosion protecting coating B containing a silicon compound is applied with a solution or dispersion containing a silane, a silanol, a siloxane, a polysiloxane or a mixture thereof on at least a part of the area Z. A further corrosion protecting coating C which is generated with an organic composition like a primer, a wet-primer, an e-coat, a powder coat, a base-coat or a clear-coat or a composition which is the same or another siloxane composition as for the thin film B may also be applied to coating B.

A process for coating a metallic surface by contacting the metallic surface with a first coating composition to form a first coating on the metallic surface, wherein the first coating composition contains water and at least one compound a) selected from a silane, a silanol, a siloxane and a polysiloxane. The first coating is the rinsed with an aqueous surfactant-containing fluid without drying so that the at least one compound a) does not condense before the rinsing step. The silane, silanol, siloxane or polysiloxane is capable of condensation.

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Linsengericht, Germany

Manfred Walter