Henkel Ag & Company, Kgaa

Ewald Dorken Ag

Reiner Wark

Marcel Roth

Eva Wilke

Uta Sundermeier

Wolfgang Lorenz

Karsten Hackbarth

Guadalupe Sanchis Otero

Thomas Moeller

Peter Kuhm

Michael Wolpers

Andreas Kunz

Christian Rosenkranz

Jürgen Stodt

Kevin Meagher

Thomas Möller

Ingo Klüppel

Angelika Troll

Carolina Battaglia

Christian Stromberg

Manuela Goeske-Krajnc

Ramona Hochstrate

Manuela Göske-Krajnc

Stephan Müller

Hanna Smoll

Manuela Goske-Krajnc

Kevin K Meagher

Kai Böge

The present invention relates to an aqueous composition based on phosphates, aluminum ions and other metal ions, in particular manganese ions and zinc ions, as well as silicates, siloxanes or silanes, for providing anticorrosive coatings on metal surfaces, in particular for the electrical insulation of grain-oriented electrical steel strip. For the desired functionality, the compositions according to the invention contain the constituents mentioned in a prescribed ratio to one another. The invention also relates to a method for coating the surface of a metallic workpiece by using the aqueous compositions, wherein the method produces outstanding results, in particular on grain-oriented electrical steel strip, with regard to corrosion protection and adherence.

Chromium-free coating for the electrical insulation of grain-oriented electrical steel strip

The present invention relates to a method for applying a weldable anti-scale coat to steel, comprising producing a thin silicatic layer free from metal pigments on the metallic steel surface, and subsequently applying and curing a wet film of a curable, pigment-containing paint; wherein said paint comprises, in solution in a liquid phase, a binder, comprising hydrolysates and/or condensates of at least one silane/siloxane and/or at least one silicone resin; at least one particulate metallic pigment of AI and at least one particulate metallic pigment of Bi. The present invention also relates to application of an organic paint film system obtainable in the method of the invention, a paint formula useful in the method of the invention, a hot forming operation on steel coated in the method of the invention; and a hot-formed steel component suitable for electrical spot welding processes.

Multi-stage method for the coating of steel prior to hot forming

The invention relates to a method for a preliminary metallizing treatment of galvanized or zinc alloy-coated steel surfaces or joined metallic parts that at least partly have zinc surfaces, in a surface treatment encompassing several process steps. In the disclosed method, metallic coats of especially a maximum of 100 mg/mof molybdenum, tungsten, cobalt, nickel, lead, tin, and/or preferably iron are produced on the treated zinc surfaces. Another embodiment of the invention relates to an uncoated or subsequently coated metallic part which has been subjected to the disclosed preliminary metallizing treatment as well as the use of such a part for making bodies during the production of automobiles, building ships, in the construction industry, and for manufacturing white products.

Preliminary metallizing treatment of zinc surfaces

The invention relates to a metal sheet, or a component made of a metallic material, comprising a layer system on the surface with at least the following layers: a) a conversion layer, comprising no more than 1 mg chromium per m, b) a layer of a cross-linked organic polymer system with a thickness in the range of 0.5 to 2.5 &#x3bc;m, comprising, in relation to the total mass of said layer, 2 to 25 wt. % of an electrically conductive pigment having a specific weight of 3 g/cmmaximum, however no more than 5 wt. % of the electrically conductive pigment having a specific weight of more than 3 g/m. A coating material and a coating method for the production of the layer b).

Conductive, organic coatings with low layer thickness and good plasticity

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Wuppertal, Germany

Reiner Wark