Microarc oxidation (MAO) is a method when a high-density current flows through the metal-electrolyte interface and there appear conditions, when microplasma discharges with high local temperatures and pressures appear on metal surface. As a result, a coating layer, consisting of oxidized forms of the elements of the base metal and electrolyte components, is formed. Depending on the mode of microarc oxidation and electrolyte composition it is possible to produce ceramic coatings with unique characteristics and a wide spectrum of application.