Pogrebova I.S.

Physical and Chemical Conditions of Complex Saturation Carbon Steel 45 by Silicon and Chrome in Medium of Chlorine

The package of the applied programs with base of the thermodynamic data was used and the theoretical analysis of physical and chemical conditions of complex saturation carbon steel by silicon and chrome in medium of chlorine in the closed reactionary space was carried out at the lowered pressure of a gas phase. The influence of structure of initial components of a sating mix on equilibrium structure gas and condensed of phases of process chromosilicided is revealed.

Modelling of Organic Compounds Adsorption on Metals Based on the HSAB Concept

The adsorption process of surfactants on metals from the perspective of the charge-transfer complexes formation and their stabilization by charging and electronic (orbit) interaction is discussed. The expediency of Lewis-Usanovych acid-base balance and coming out of it principle of Pearson’s “hard” and “soft” acids and bases (HSAB) application in modelling of adsorption processes is shown. Equations that corresponds to the electrode adsorption equilibrium, conditioned by charging, electronic and charge-electron interaction are derived and qualitatively validated.

Heat Resistance and Corrosion Resistance of Complex Chromium+Aluminum Diffusion Coatings on Titanium Alloy VT6

In this paper we study the microstructure, phase and chemical composition of complex chromium+aluminum diffusion coatings obtained by simultaneous saturation of titanium alloy VT6 with chromium and aluminum from powder mixtures. We discover that coatings consist of three separate layers of Al3Ti, AlTi, AlTi3 phases. The microhardness of diffusion multilayers in the area of Al3Ti phase is 7,1–9,0 GPa, of the main diffusion layer AlTi – 5,2–8,2 GPa and 11,0 GPa for the AlTi3 phase, that is by 2-4 times higher the microhardness of initial VT6 (3,63 GPa).

The Heat Resistance of Diffusion Chromosilicide Coatings Applied on a Carbon Stells

The paper studies heat resistance and the mechanism of high-temperature oxidation of chromosilicide diffusion coatings applied on a surface of carbon steels by a gas method. We define the factors of influence on the process of high-temperature steels oxidation with the obtained coatings. The interrelation between the composition, the structure of diffusion layers and the speed of high-temperature oxidation is established. We show that the obtained coatings have a high heat resistance in an interval of temperatures between 623–1273 K.

The Corrosion Resistance of Chrome-calorized Steel 12Х18N10T

The paper under scrutiny presents the research results of chrome-calorized steel 12Х18N10T. Moreover, we demonstrate that it is possible to obtain complex chrome-calorized coating with titanium nitride TiN on the surface of the steel 12Х18N10T. To obtain this coating, we combine two processes: physical vapor deposition of titanium nitride and diffusion of chrome-calorizing conducted through the powder method in containers with fusible gate under reduced pressure at 1050 C for 3 hours. Hence we obtain the structure, phase and chemical composition of coatings.

Heat-Tolerance of Carbide Coverages Obtained at a Successive Satiation of U8А Steel by Chrome and Titan

In this paper, we study the structure and properties of carbide coverages based on titan and chrome carbides on U8A steel. We discuss possible reactions of the interaction between chrome and titan carbides with oxygen and determine the chemism of coverages oxidization. Finally, we show the advantage of complex two-component coverages as compared to single-component ones