ИСТИНА

The purpose of the research was to study the corrosion properties of alloys of the Ti-Co, Ti-Co-Re and Ti-Co-Ta systems. Ta and Re acted as alloying components. Alloys of these systems have potential applications in the aviation industry, in particular in the aviation engine industry as a material for turbine housings, as they have valuable physico-chemical and mechanical properties. Along with electrochemical research methods, including impedance measurement, spectral analysis methods were also used – local X-ray spectral and X-ray phase analysis. As a result of the research, it was concluded that three-component alloys have increased resistance to corrosion; their corrosion currents are 4.5×10-5 A/cm2 and 2.4×10-5 A/cm2 , respectively, for Ti-Co-Ta and Ti-Co-Re alloys, while for Co-Ti alloy The corrosion current was 1.2×10-4 A/cm2 . This is due to the influence of the third component: in the case of rhenium, the adhesion of the oxide film to the surface increases, and in the case of tantalum, the appearance of an anodic oxide film Ta2O5, which has a higher density than TiO2, and, consequently, has greater protective properties. The preformed anodic oxide films have a covering effect on all the studied alloys and reduce corrosion currents in the case of Ti-Co and Ti-Co-Re alloys by two orders of magnitude, for the Ti-Co-Ta system alloy by one order of magnitude. The lowest corrosion current is realized on an alloy containing rhenium, which confirms the previous conclusion about an increase in adhesion of the already preformed anodic oxide.