АНОДТЫ МИКРОДОҒАЛЫҚ ОКСИДТЕУ ӘДІСІНІҢ ТИІМДІЛІГІН БАҒАЛАУ КРИТЕРИЙЛЕРІ РЕТІНДЕ ПРОЦЕСТІҢ НЕГІЗГІ ПАРАМЕТРЛЕРІ ЖӘНЕ ЖАБЫНДАРДЫҢ СИПАТТАМАЛАРЫ

Abstract

The article is devoted to the evaluation of the rationality and effectiveness of improving the microarc oxidation process by modifying the spark conditions and parameters, as well as the selection of criteria for assessing the quality and predicting the functional properties of the formed ceramic coatings. In changing the nature of the formation of the structure and ensuring the expected quality and properties of the oxidized alloy, the intensity of sparks arising during electrical discharges moving along the treated surface of an object immersed in an electrolyte plays a predominant role. The intensity of the sparks determines the circumstances of obtaining equivalent coatings: the smaller the nature of the sparks around the oxidized part, the more evenly and rapidly the thickness of the formed coating grows and the higher its density. These considerations allowed us to propose an option for improving the MDA (AMAO) anode method, characterized by the presence of only the anode component of the current, thereby allowing thin coatings with branched porosity to be obtained by stabilizing the sparking process using a system of quasi-cathodes in an electrolysis bath. In a real study, the possibilities of controlling the parameters of coatings obtained by the AMAO method in its standard and upgraded versions are considered by fixing the nature of the separation of spark discharges in real time, indirect proof of which is the modification of the current density over time and the uniformity of the thickness of the coatings created. Taking into account the impact of the nature of micro-oxidation on the structural and sound properties of the formed layers, the coating surface obtained by an improved method must be sound, one of the indicators is a smooth and uniform relief. Thus, another criterion for the performance of the improved process can be amplitude-step roughness parameters, which, without allowing an unbiased assessment of the microprofile of the coating being formed, can give more broad information about the nature of its thickness growth and quality changes, which in the final consequence determines the level of use of metal objects with such a coating.