Electrophysical Model of the Micro-Arc Oxidation Process

On the basis of the equivalent electrical circuit proposed by the authors, a mathematical model of the formation of protective coatings by the micro-arc oxidation method has been developed, which allows modeling the forming curve at the anodizing stage. Expressions are derived for the surface porosity of the anodic oxide film and the minimum electron current flowing through the pores during the film breakdown. The conditions for the appearance of vapor-gas bubbles are considered. Using the Kolmogorov–Johnson–Mehl– Avrami equation, the possibility of calculating the fraction of formed crystalline aluminum oxide as a result of a phase transition is shown. The research results can be used to develop a generalized mathematical model of the micro-arc oxidation process.