Metal sheet having a deterministic surface structure and method for producing a formed and coated sheet-metal component

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.

1 . 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
 wherein at least one of the peak region and the valley region have a substructure configured such that the substructure has a surface area greater by at least 3% in comparison to a flat projection face (P) of at least one of the peak region and of the valley region or has an Sdr of at least 3%.   
     
     
         2 . The sheet metal as claimed in  claim 1 , wherein the substructure has a surface area greater by at least 7% in comparison to the flat projection face (P) of at least one of the peak region and of the valley region or has an Sdr of at least 7%. 
     
     
         3 . The sheet metal as claimed in  claim 2  wherein the substructure being configured in a crystal-like manner in at least one of the peak region and in the valley region. 
     
     
         4 . The sheet metal as claimed in  claim 3  wherein, the sheet metal is coated with a metallic coating. 
     
     
         5 . The sheet metal as claimed in  claim 4  wherein, the sheet metal is coated with one of a phosphate coating or silane-based coating, and wherein the thickness of the coating is less than 500 nm. 
     
     
         6 . A method for producing a formed and coated sheet-metal component, the method comprising the following steps:
 providing a sheet metal having a deterministic surface structure, the surface structure having been impressed into the sheet metal by means of a skin-pass roll, 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,   forming the sheet metal into a sheet-metal component,   coating the formed sheet-metal component,   
       wherein the skin-pass roll with which the surface structure has been impressed into the sheet metal, during the impressing in at least one of the peak region and in the valley region, has generated a substructure such that a substructure has been generated that has a surface area greater by at least 3% in comparison to at least one of a flat projection face (P) of the peak region and of the valley region or that has an Sdr of at least 3%. 
     
     
         7 . The method as claimed in  claim 6 , wherein no zinc phosphating having been carried out before the forming of the sheet metal. 
     
     
         8 . The method as claimed in  claim 7 , wherein the sheet metal, before the providing of the sheet metal, has been coated with one of a phosphate coating or silane-based coating, wherein the thickness of the coating is less than 500 nm. 
     
     
         9 . The method as claimed in  claim 8 , wherein the sheet metal has been treated with an acidic solution before or after the introduction of the surface structure. 
     
     
         10 . The method as claimed in  claim 9 , wherein the sheet-metal component is an outer skin part of a vehicle. 
     
     
         11 . The method as claimed in  claim 9 , wherein the sheet metal component is a structural part of a vehicle.