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The microarc oxidation (MAO) method by its power action on treated material can be referred to methods of surface strengthening by concentrated streams of energy. The local action of microarc discharges on a metal surface depends both on electric characteristics of microarc discharge and parameters of electrolyte and on characteristics of treated metal. Good wear resistance of MAO coatings is being explained by a high level of physical and mechanical characteristics and by their structural constitution. The aim of the investigations presented in this article is the estimation of MAO coating wear resistance compared with other wear-resistant materials. The basic trials of materials were conducted on abrasive outwearing using pin-ondisc friction schema. MAO layers with threadlike mono-crystals of α-Al 2 O 3 (emery) have the best mechanical and tribotechnical characteristics. Such microstructures have MAO coatings on aluminium alloys of the Al-Cu-Mg system -duralumin. They represent the most effective structure ensuring high wear resistance.

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In the past years, the most promising technology of producing ceramic coatings is a method of microarc oxidation. This method is characterized by universal properties of surface layer, which combines high-wear resistance, corrosion resistance, heat, and erosion resistance. The aim of the present work is to improve the tribological properties of microarc oxidation coatings using additional filling layer of coating as a thin film of polymer material. Ultra-high-molecular weight polyethylene was chosen as a polymer material. This composition material was tested under different friction conditions and showed significant decrease in friction coefficient for many friction pairs in different lubricant environment. The proposed technology of antifriction characteristics improvement of microarc oxidation coatings will significantly expand their application.