Abstract: The invention relates to a striplike or sheetlike steel substrate hot-dip-coated with a metallic coating based on zinc and having a modified surface, and to a method for producing a semifinished product with modified surface, comprising at least one method step of at least regionally modifying the surface of a coated, skin-pass-rolled, oiled and cleaned metallic steel substrate by means of atmospheric-pressure plasma treatment of said surface regions with oxygen, air, forming gas or a mixture of 2 or more of these gases as process gas. The invention further relates to the accordingly produced semifinished products and/or flat steel products, optionally formed semifinished products and/or flat steel products, and to their use.

Abstract: The present disclosure relates to a hot-dip-coated steel sheet having a Zn—Mg—Al coating which includes aluminum at between 0.1 and 8.0 wt %, magnesium at between 0.1 and 8.0 wt %, the balance being zinc and unavoidable impurities, wherein the coating comprises zinc grains and further phases of magnesium and/or aluminum and also eutectic structures including at least intermetallic zinc-magnesium phases, wherein a native oxide layer is formed on the coating. In accordance with the present disclosure, the coating beneath the native oxide layer has an area fraction of at least 35% in which there is an average nanohardness of at least 4 GPa.

Abstract: The invention relates to a sheet steel (1) coated with a zinc-based coating and skin-pass rolled with a deterministic surface structure (2), and to a method for producing it.

Abstract: The invention relates to a sheet steel skin-pass rolled with a deterministic surface structure, and to a method for producing it.

Abstract: The invention relates to a sheet steel (1) coated with a zinc-based coating and skin-pass rolled with a deterministic surface structure (2), and to a method for producing it.

Abstract: The invention relates to a steel sheet skin-pass rolled with a deterministic surface structure, and to a method for producing it.

Abstract: The present disclosure relates to a process for producing a surface-treated and surface-finished sheet steel. A sheet steel having a zinc-based coating is provided, wherein zinc grains are distributed within the coating. The surface-treated sheet steel are skin-pass rolled to form embossed regions and unembossed regions on the surface of the sheet steel provided with a zinc-based coating. Skin-pass rolling is performed with a degree of skin-pass greater than 1% in such a way that due to the force exerted by the skin-pass rolling the zinc grains in the embossed region are altered in dimension relative to the zinc grains in the unembossed region.

Abstract: A method for production of a flat steel product including at least the following steps, completed in a continuous process: providing a flat steel product, wherein a protective metal layer of Zn, a Zn—Al alloy, a Zn—Mg alloy or a Zn—Mg—Al alloy is applied to at least one side by hot dip coating; at least partly removing a native oxide layer present on the surface of the protective metal layer by wetting this surface with an acidic solution of sulfuric acid, sulfurous acid, hydrochloric acid, phosphoric acid, phosphonic acid, nitric acid, formic acid, oxalic acid, acetic acid, citric acid, malic acid, tartaric acid, nitrous acid or hydrofluoric acid; activating the surface of the protective metal layer by applying an aqueous activation solution to the surface of the protective metal layer; and phosphating the activated surface of the protective metal layer by applying an aqueous phosphating solution to the activated surface.

Abstract: The invention relates to a sheet metal having a deterministic surface structure, the surface structure being impressed into the sheet metal, the surface structure having at least one peak region and at least one valley region, the peak region and the valley region being joined by a flank region. The invention further relates to a method for producing a formed and coated sheet-metal component.

Abstract: The invention relates to sheet steel, more particularly a coated sheet steel, which is skin-pass rolled with a deterministic surface structure, and to a method for producing this steel.

Abstract: A method of activating a metal surface, such as a galvanized steel sheet, before a phosphating process, may involve bringing the metal surface into contact with an activating bath containing activating particles, which may be based on phosphate and/or titanium, dispersed in water. To alleviate or even eliminate the problems of poor adhesion of surface coatings to preferably electrolytically galvanized, phosphated metal strip, an additive that suppresses or at least slows agglomeration of the activating particles may be added to the activating bath. In some examples, polyethylene glycol (PEG) and/or sodium stearate may be added. Further, the particle size distribution of the activating particles present in the activating bath may be determined and the activating bath may be replaced or taken out of operation as a function of the particle size distribution of the activating particles.

Abstract: A method of activating a metal surface, such as a galvanized steel sheet, before a phosphating process, may involve bringing the metal surface into contact with an activating bath containing activating particles, which may be based on phosphate and/or titanium, dispersed in water. To alleviate or even eliminate the problems of poor adhesion of surface coatings to preferably electrolytically galvanized, phosphated metal strip, an additive that suppresses or at least slows agglomeration of the activating particles may be added to the activating bath. In some examples, polyethylene glycol (PEG) and/or sodium stearate may be added. Further, the particle size distribution of the activating particles present in the activating bath may be determined and the activating bath may be replaced or taken out of operation as a function of the particle size distribution of the activating particles.