Wear resistance of friction couple parts in aviation and space technology

The article discusses the technique of microarc oxidation (MAO) of aluminum alloy AMg6. Coatings obtained by this technique have a much higher wear resistance and service life as compared to coatings obtained by anode treatment. To perform experiments on preparation and analysis of the formed coatings, the authors used an MAO setup, which enables to produce coatings by supplying a high (up to 1000 V) asymmetric alternating voltage between the part and the bath filled with electrolyte, an optical confocal microscope Olympus LEXT OLS 5000 to determine volumetric wear and visually assess wear zones, and a specially designed friction machine enabling to simulate all types of sliding conditions from partial to reciprocating sliding. Pilot experiments determined the impact of the coating surface state on the friction coefficient, and then, by constructing and analyzing the dependences of friction forces on shift amplitude under various applied normal loads, fretting maps were obtained, which made it possible to elaborate recommendations for assessing wear under various sliding conditions.