Research evidence of plasma parameters effect when spraying aluminum oxide powder, causing the porosity and electrical resistance of the coating is offered in the article. A mathematical model of the coating effect dependence on spray coating modes, e.g. plasmotron distance to underlay surface, current strength and hydrogen consumption is proposed. Positive cor-relation between the porosity and the electrical resistance of the coating is shown.

Ageing quality kinetic model of adhesive compound of metals, when subjected to loadings by normal fracture method, is viewed. The results of the study of compound parameters effect on the pattern of change in the concentration of adhesive bonds are given. The article presents theoretical prediction of compound parameters for a safe ageing quality mode