The second part of the book systematizes information about the modern method of surface treatment and hardening of metals, which makes it possible to obtain multifunctional protective coatings - microarc oxidation (MAO). The history of the development of research on this issue, the mechanism of formation of anodic oxide films, the metal-oxide-electrolyte system and its features, the asymmetry of conductivity in this system, the breakdown of anodic oxide films and sparking, the basic concepts of the MAO process and its mechanism, the role of the discharge and dynamics are considered. its development in the formation of coatings obtained by MAO, classification of microplasma methods, basics of MAO technology (electrolytes, modes), equipment for microarc oxidation. A comparative analysis of various methods of anodizing and microarc oxidation is given, and the practice of microarc oxidation is analyzed. The composition, structure, and properties of MAO coatings are considered in detail. Numerous examples of the use of MAO coatings are given.For engineering and scientific workers, students of technical universities.