Based on thermodynamic calculations and analysis of experimental literature data the fields of the primary crystallization of the phases, the types and coordinates of non and monovariant equilibria in the Cu-Pb-Te system are determined. It has been revealed that the ternary compound is not formed in the system, and in the solid state it is divided into subsystems with the participation of lead telluride: Cu-PbTe-Pb, Cu-Cu 2-x Te-PbTe, Cu 2-x Te-Cu 5 Te 3-PbTe, Cu 5 Te 3-Cu 4 Te 3-PbTe, Cu 3-x Te 2-CuTe-PbTe, CuTe-Te-PbTe. The projection of the liquidus surface Cu-Pb-Te is determined. On the basis of phase diagrams of the boundary binary systems and the limited number of DTA data of the ternary system by using the OriginLab program, equations are obtained for calculating and 3D modeling of the PbTe, CuTe, Cu 2-x Te, Cu 3-x Te 2 , and Cu 5 Te 3 crystallization surfaces and the surface of the liquid immiscibility in the Cu-Pb-Te system. There are regions of immiscibility for the liquid phase from the side Cu-Cu 2-x Te and Cu-Pb. With an increase quantity of the third component, the critical temperature immiscibility decreases. Defined in the work 3D model for the system Cu-Pb-Te keeps the corresponding analytical function and table data in the form of matrices.

Se system was investigated. Equations were obtained to calculate the partial excess energy functions of mixing lead and selenium for Cu-Pb-Se alloys saturated with lead selenide. The obtained analytical dependences Txy and p (Se 2)-Tx were visualized. It found that when describing the effect of selenium partial pressure on Gibbs partial molar free energy at high pressure, it is necessary to take into account the contribution of the volumetric member. Changes in the energy of defect formation from the electronic chemical potential function in samples based on PbSe in Cu-Pb-Se were studied. Proceeding from the constructed Cu-Pb-Se phase diagram of the isothermal section, a single phase region was determined based on PbSe and two phase regions between PbSe and copper selenides.

Causes of corrosion of liquid steel-bearing steel products under the influence of external and internal environment in industrial and public areas today. Methods of prevention of corrosion of corrosive metals by today's technologies. Various methods have been used to address the main problems of the industrial use of gold, steel and silver metals, the causes of corrosion of metals

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