Atotech Deutschland Gmbh

Joshi, Nayan H.

Nayan H Joshi

Maulik Dhanesh Mehta

Kerri Little Carver

Thomas Anthony Patena

Christopher George Ringholz

Jacob Grant Wiles

Jacob G Wiles

To achieve efficient stripping of organic coatings from sensitive substrate without affecting the substrate surface, a novel non-aqueous stripping composition and method are provided. The stripping composition comprises: A. at least one high-boiling solvent selected from the group, consisting of alcohols having general chemical formula R&#x2014;OH, wherein R is a C-Chydrocarbon group, wherein the high-boiling solvent has a boiling point of at least 100&#xb0; C.; B&#x2014;at least one high-boiling co-solvent selected from the group, consisting of high-boiling glycols, glycol ethers and amine compounds, wherein the high-boiling co-solvent has a boiling point of at least 100&#xb0; C.; and C&#x2014;at least one pH-active agent either selected from the group, consisting of acid compounds or selected from the group, consisting of hydroxide compounds.

Non-aqueous stripping composition and a method of stripping an organic coating from a substrate

The invention relates to a non-aqueous stripping composition for removing cured organic paint from substrates comprising

Composition and method for removal of organic paint coatings from substrates

Improved compositions and processes for zincating magnesium and magnesium alloy substrates. An aqueous zincating composition having a pH of from about 8 to about 11 and including zinc ions, a complexing agent, fluoride ions and a reducing agent. A non-electrolytic process for zincating a magnesium or magnesium alloy substrate, including immersing the substrate in the non-electrolytic aqueous zincating composition for a time sufficient to deposit a zincate on the substrate. A non-electrolytic process for zincating a magnesium or magnesium alloy substrate, including preparing a aqueous non-electrolytic composition comprising zinc ions, a complexing agent, fluoride ions and a pH in the range from about 8 to about 11; adding to the composition an amount of a reducing agent sufficient to improve deposition of zincate on the magnesium or magnesium alloy substrate; and immersing the substrate in a composition for a time sufficient to deposit the zincate on the substrate.

Composition and process for improved zincating magnesium and magnesium alloy substrates

The present invention provides a non-cyanide aqueous acidic immersion plating solution having a pH of from about 3.5 to about 6.5 and comprising zinc ions, nickel ions and/or cobalt iron ions, and fluoride ions. In one embodiment the immersion plating solutions of the invention also contain at least one inhibitor containing one or more nitrogen atoms, sulfur atoms, or both nitrogen and sulfur atoms. The present invention also relates to methods for depositing zinc alloy protective coatings on aluminum and aluminum alloy substrates comprising immersing the aluminum or aluminum alloy substrate in the non-cyanide acidic immersion plating solutions of the invention. Optionally, the zinc alloy coated aluminum or aluminum alloy substrate is plated using an electroless or electrolytic metal plating solution.

Aqueous acidic immersion plating solutions and methods for plating on aluminum and aluminum alloys

A process for cleaning (e.g., desmutting) an aluminum surface, using compositions free of nitric acid and chromic acid and comprising, in one embodiment, an oxidant and at least one mineral acid salt. In another embodiment, the process uses a composition free of nitric acid and chromic acid and comprising an oxidant, at least one mineral acid salt, and a complexing agent which is a salt of an organic acid. Due at least in part to the absence of nitric and chromic acids, and in particular, strong mineral acids, the cleaning processes of the present invention remove smut residues from aluminum surfaces without significant etching of the aluminum.

Process for cleaning aluminum and aluminum alloy surfaces with nitric acid and chromic acid-free compositions

The present invention relates to methods for depositing zincate coatings on aluminum and aluminum alloys comprising applying an immersion zincate coating on an aluminum or aluminum alloy substrates, optionally followed by plating the zincate coated aluminum or aluminum alloy substrate using an electroless or electrolytic metal plating solution. The present invention also relates to an improved aqueous alkaline zincate solution comprising hydroxide ions, zinc ions, nickel ions and/or cobalt iron ions, copper ions, and at least one inhibitor containing one or more nitrogen atoms, sulfur atoms, or both nitrogen and sulfur atoms provided said nitrogen atoms are not present in an aliphatic amine or hydroxylamine.

Aqueous alkaline zincate solutions and methods

The present invention provides an improved aqueous alkaline zincate solution comprising hydroxide ions, zinc ions, nickel ions and/or cobalt iron ions, copper ions, and at least one inhibitor containing one or more nitrogen atoms, sulfur atoms, or both nitrogen and sulfur atoms provided said nitrogen atoms are not present in an aliphatic amine or hydroxylamine. The present invention also relates to methods for depositing zincate coatings on aluminum and aluminum alloys comprising applying an immersion zincate coating on an aluminum or aluminum alloy substrates, optionally followed by plating the zincate coated aluminum or aluminum alloy substrate using an electroless or electrolytic metal plating solution.

A method of forming a conductive metal layer on a non-conductive surface, including providing a non-conductive surface; contacting the non-conductive surface with an aqueous solution or mixture containing a stannous salt to form a sensitized surface; contacting the sensitized surface with an aqueous solution or mixture containing a silver salt having a pH in the range from about 5 to about 10 to form a catalyzed surface; and electroless plating the catalyzed surface by applying an electroless plating solution to the catalyzed surface.

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Rock Hill, SC, United States of America

Nayan H Joshi