METHOD FOR MONITORING AND CONTROLLING THE PROCESS OF MICROARC OXIDATION Russian patent published in 2023 - IPC C25D11/00 G01R27/14 

FIELD: electroplating.

SUBSTANCE: method includes microarc oxidation (MAO) of the surface of test samples in specified modes, differing from each other in different rates of increase in electric voltage and current in the initial period of MAO until the formation of a passivating layer on the surface of the product and the period of MAO with a constant voltage or current and a value of constant voltage or current, registration of the electrical signals parameters of the power source feedback circuit of the MAO unit during MAO, researching and obtaining numerical values of the required characteristics of the oxide coating upon completion of MAO, obtaining numerical values of the electrical signals parameters of the power supply feedback circuit of the unit, calculation of the coefficients of the regression equations, which are a system of linear polynomials, the number of which is determined by the number of characteristics of the coating and the number of analyzed parameters of the electrical signals of the power supply feedback circuit of the unit, defining a pattern between the characteristics of the coating and the recorded parameters of the electrical signals of the power source feedback circuit of the unit, MAO of the part based on the defined pattern and the specified MAO mode in order to obtain the required characteristics of the oxide coating on the parts, whereas the process is controlled by the recorded parameters of the electrical signals of the power source feedback circuit of the unit in the continuous monitoring mode and when the values of the electrical signals parameters of the power source feedback circuit corresponding to the defined pattern are reached, the process is stopped.

EFFECT: controlling the characteristics of the oxide coating applied to metals and alloys by the MAO method, which makes it possible to improve the accuracy of the obtained values of the consumer characteristics of the coating, such as thickness, roughness, hardness, porosity.

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