The monograph focuses on the analysis of possibilities of plasma electrolytic synthesis for modification of a surface of light alloys for the purpose of creation of biocompatible coatings. The analysis of kinetics and growth mechanism of coatings, characteristics of individual discharges and their thermal effect on the electrode layer are presented. The classification of solutions and conditions of the plasma electrolytic process are provided. The possible mechanisms of formation of refractory compounds at the metal / oxide / electrolyte boundaries are considered. Specific recommendations for coating titanium and magnesium alloys are provided. Elemental and phase composition of coatings are specified. Methods of pores filling are described. Test results of coatings in artificial biological media are provided.For scientists specializing in electrochemistry, material science and specialists in the field of protective coatings.