Abstract
The approaches to maintenance of equal wear resistance of metal surfaces of metal working parts are considered. It is shown, that the equal resistance to wear process and as a result sharp increase of service life of parts is provided by selective drawing of coatings by means of electroerosion alloying in zones of unfavorable conditions of parts interaction or interaction of parts and environment during construction service. The deviation of conditions of surfaces interaction from normal state is defined on the basis of the analysis of the mechanical interaction, temperature field and physico-chemical processes on interface boundary.