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

US9637662B2 · kind B2 · utility

Assignee

• Henkel AG & Co. KGaA · DE

Inventors

• Marcel Roth · Goldkronach, DE
• Reiner Wark · Wuppertal, DE
• Thomas Moeller · Goldkronach, DE
• Eva Wilke · Hilden, DE
• Uta Sundermeier · Leichlingen, DE
• Manuela Goeske-Krajnc · Hilden, DE

Key dates

• Filing date: Jun 12, 2015
• Grant date: May 2, 2017
• Expiry date: Jul 1, 2035

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/265
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

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.