Features of Plasma-Electrolytic Coatings Formation on Metalware Surface

The paper presents the principal advantages of plasma-electrolytic coating method that characterize it as a highly promising technology. It is shown that these advantages are provided by the integrated nature of the effect, representing a combination of the main types of impacts on a surface: electrical, thermal, mechanical and chemical. This combination distinguishes the method of plasma-electrolytic treatment from many other widespread in up-to-date technology combinations composed generally of two types of impacts. It is suggested that the process of plasma-electrolytic coating is carried out by the mechanism of metal pressure welding that is confirmed by the results of tests for determining quality ratings of coatings. It is shown the thermodynamic and kinetic unity of these processes that allows plasma-electrolytic coating to be put in class of metal pressure welding processes and to consider the processes of coating by plasma-electrolytic method and pressure welding from a common methodological framework. The paper presents the results of the structure and composition studies of zinc plasma-electrolytic coatings on a strip for armoring cables of group A (GOST 3559-75). The researches were carried out using scanning electron microscopy, microroentgenspectral analysis and differential scanning calorimetry.