Patent ID: 8337687

Claim:
A structured chromium solids particles layer comprising: a plurality of solids particles embedded within a network of cracks, wherein the network of cracks has a crack density of 10-250 /mm, the solids particles have a particle size in the range of 0.01-10 μm, a proportion of the solids particles in the structured chromium solids particles layer is 1-30 vol.-%, the structured chromium solids particles layer has a microstructure with a plurality of depressions in the surface of the layer, and the depressions account for a depression proportion of 5-80% of a total surface area; wherein the structured chromium solids particles layer has an average of 3 to 100 depressions with a maximum extension of more than 30 μm per square millimeter of the total surface area and are more than 3 μm deep.