Patent ID: 11905579
Assignee: THYSSENKRUPP STEEL EUROPE AG
Field: Surface technology, coating (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 14:
15. A method for producing a sheet steel coated with a zinc-based coating and skin-pass rolled with a deterministic surface structure, comprising the following steps:
providing a sheet steel coated with a zinc-based coating, the coating, as well as zinc and unavoidable impurities, comprising additional elements including aluminum with an amount of 0.1 up to 5 wt% and magnesium with an amount of 0.1 up to 5 wt% in the coating, and
skin-pass rolling the coated sheet steel with a skin-pass roll, where the surface of the skin-pass roll which acts on the surface of the sheet steel is furnished with a deterministic surface structure such that after the skin-pass rolling, the surface structure of the coated and rolled sheet steel has peak regions and valley regions which are connected to one another via flank regions, and the exposure to the skin-pass roll establishes a concentration of magnesium on the surface of the coating in the valley regions which is lower than on the surface of the coating in the peak regions.