RESEARCH ON THE PROPERTIES OF HEAT-RESISTANT COATINGS FORMED BY PLASMA ELECTROLYTIC OXIDATION OF ALUMINUM ALLOYS
DOI:
https://doi.org/10.31471/1993-9965-2024-2(57)-15-24Keywords:
technological process, control system, plasma electrolytic oxidation, aluminum alloy, heat-resistant coating, taper, microhardness, friction, wear, temperature.Abstract
The possibilities for using plasma electrolytic oxidation technology to create oxide heat-resistant coatings on aluminum alloys were confirmed after an investigation of strengthening techniques was completed. In a flowing electrolyte, the work aims to investigate the effects of technological modes of the plasma electrolytic oxidation process for aluminum alloys. In order to maintain the technological parameters of the plasma electrolytic oxidation process of parts in a flowing electrolyte at a specific level, a control system was developed. This system allows for the control of the electrolyte's hydrogen index and electrical resistance, as well as the ratio of electrolyte component concentrations, flow rate, current density, current ratio, and electrolyte temperature. A technological process for plasma electrolytic oxidation of aluminum deformed and cast alloys in a flowing silicate-alkali electrolyte was developed. Oxide heat-resistant coatings were formed at different values of the technological parameters of the plasma electrolytic oxidation process. The properties of oxide coatings were evaluated, respectively, by measuring the coating thickness, the taper of the samples, microhardness, wear tests and frictional heat resistance. To study the influence of the technological parameters of the plasma electrolytic oxidation process on the geometric and physicomechanical properties of samples with oxide coatings, the research was carried out with different combinations of these parameters. According to the results of the experiments, graphical dependences were constructed for the microhardness, wear and taper of the oxide coating surface on the technological parameters of the plasma electrolytic oxidation process. The influence of the technological parameters of the plasma electrolytic oxidation process was established: the ratio of the concentrations of the components (Na2SiO3/KOH), current density, flow rate, electrolyte temperature, which ensure minimal wear of the oxide coating and sufficiently high physicomechanical properties and accuracy of the shape of the parts, microhardness and wear. The results of the research showed that the operational properties of oxide coatings depend on almost all the constituent modes of the plasma electrolytic oxidation process. Samples with oxide coating were also tested for frictional heat resistance during dry friction according to the “ring-ring” scheme. It was found that the temperature in the friction zone of aluminum samples with oxide coating is lower compared to steel samples without coating, which indicates high frictional heat resistance of the oxide coating.
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