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Assigneethyssenkrupp Rasselstein GmbH
InventorsHelmut OBERHOFFER, Benjamin LIEBSCHER, Anika SZESNI, Reiner SAUER, Karl-Ernst FRIEDRICH
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A method for coating a steel sheet with a metal layer includes the following steps: application of a first thin metal layer as a flash coating; melting the metal layer from the flash coating; and application of at least one additional metal layer onto the metal layer from the flash coating. To increase the corrosion resistance of the coated steel sheet and to improve the energy and resource efficiency of the coating method, with which a steel sheet having a high corrosion resistance and good weldability and with a good deep drawing and ironing behavior is to be produced, the thickness of the metal layer from the flash coating is at most 200 mg/m2 and the metal layer from the flash coating is melted with electromagnetic radiation of high energy density.
Method for coating a steel sheet with a metal layer, comprising the following steps:
Device for galvanic coating of a steel strip with a metal layer, with a plurality of successively arranged coating baths, through which the steel strip is passed in a strip running direction to apply the metal layer by galvanic deposition, wherein a thin metal layer is first applied as a flash coating in the furthest forward coating baths in the strip running direction, and then additional metal layers are applied in the downstream coating baths, wherein a radiation source for electromagnetic radiation or an electron beam is arranged downstream of the first coating bath or baths in the strip running direction, in order to melt the metal layer from the flash coating with electromagnetic radiation, particularly a laser beam, or an electron beam.
Steel sheet provided with a metal coating, wherein a thin alloy layer of steel atoms from the steel sheet and metal atoms from the coating material is formed in the interface between the surface of the steel sheet and the metal coating, wherein the thickness of the alloy layer is at most 200 mg/m2 and the content of free, unalloyed metal in the metal coating is at least 50% and preferably lies between 80% and 99%.
Dependencies are inferred from the claim text.