Multi-stage method for the coating of steel prior to hot forming
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United States of America Patent
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May 2, 2017
Grant Date -
Oct 1, 2015
app pub date -
Jun 12, 2015
filing date -
Dec 17, 2012
priority date (Note) -
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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.
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