Textbook for students of metallurgical universities and faculties. It can be useful for engineering and technical workers of design organizations, research institutes, metallurgical plants, chemical industry enterprises involved in protecting metals from corrosion. Modern ideas about the thermodynamics and kinetics of metal oxidation, the mechanism of formation and the laws of growth of various films are given, the mechanism and various types of electrochemical corrosion are considered, the most important methods for studying corrosion processes are described.