There are a number of factors which affect the tribological properties of the coatings. These are, among others, their density and microstructure, size of grain, residual stresses as well as the interfacial surface between the substrate and the coating. These factors are related to the method of coating deposition. One of the parameters which determine the friction coefficient is the roughness. Those coatings which are rougher are normally characterised by a smaller critical force and a larger friction coefficient [22]. On account of the method that the examined coatings were obtained, they are characterised by a relatively high roughness, which is corresponding for this deposition method. This could be the reason why the friction coefficient shows a higher value. The friction coefficient values are presented in Figs. 7 and 8 are slightly higher from those that can be found in literature.