OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 4 2024 extreme operating conditions. This section is dedicated to analyzing the corrosion properties of HEAs and the mechanisms of its corrosion resistance. The study [36] showed that the addition of aluminum to high-entropy FeCoCrNiAlx (x = 0.1; 0.3) alloy improves its mechanical properties and reduces weight. The eff ect of aluminum on the corrosion behavior and properties of alloy fi lms in H2SO4 solutions was analyzed. Results showed that increasing aluminum content improves corrosion resistance in H2SO4 solution. The study [37] evaluated the corrosion resistance of high-entropy FeCoNiCr alloy coatings obtained by electrochemical deposition. The coatings synthesized from Fe, Co, Ni, and Cr sulfate solutions formed a crack-free, granular surface with a grain size ranging from 500 nm to 5 μm. Electrochemical measurements demonstrated high corrosion resistance of the coatings in various environments, including NaCl, H2SO4, and NaOH solutions. The study highlights the potential of these coatings for engineering applications due to its excellent corrosion resistance. The paper [38] examines the eff ect of ultrasonic shot peening on the corrosion resistance and antibacterial properties of the high-entropy Al0.3Cu0.5CoCrFeNi alloy. The primary goal of the study was to eliminate the contradictions between the corrosion resistance and antibacterial properties of the alloy by using ultrasonic shot peening. The results of the study confi rmed that ultrasonic shot peening improved the corrosion resistance and antibacterial properties of the high-entropy Al0.3Cu0.5CoCrFeNi alloy. Electrochemical tests showed that ultrasonic shot peening contributed to the formation of a more protective passive fi lm, reducing the corrosion current density. Scientists have developed a new high-entropy AlTiVCrCu0.4 alloy, which has low density and high hardness. The study showed that the dual-phase high-entropy AlTiVCrCu0.4 alloy has unique mechanical and corrosion properties due to its complex structure consisting of BCC and HCP phases. The alloy exhibits outstanding corrosion resistance in aggressive environments, which is associated with the formation of a protective metal oxide fi lm [39]. The study [40] examines the eff ect of cold rolling and annealing on the corrosion properties of Al2Cr5Cu5Fe53Ni35 alloy, focusing on grain size changes and its impact on corrosion behavior. The results show that reducing grain size improves the localized corrosion resistance of the material. The developed alloy demonstrates improved anti-corrosion properties, making it promising for marine applications. The best corrosion resistance was observed with 85 % thickness reduction and a 3-minute annealing period. The noble behavior of the material is maintained in solutions with varying seawater concentrations. The eff ect of cold rolling and post-deformation annealing on the properties of the high-entropy CrMnFeCoNi alloy was studied [41]. The results showed that the grain size decreased from 207.5 μm to 4.6 μm. Microhardness, yield strength, and tensile strength increased by 28 %, 68 %, and 24 %, respectively, but the percentage elongation decreased from 59.3 % to 43.8 %. The strengthening mechanisms are associated with grain refi nement and increased dislocation density. The corrosion resistance of the alloy also improved due to a decrease in grain size and residual compressive stress. The paper [42] examines the eff ect of friction stir processing on the corrosion resistance of high-entropy CoCrFeNiCu alloy. Friction stir processing involves the use of a rotating tool that moves across the surface of the material, generating high temperatures and mechanical stresses. This results in plastic deformation and mixing of the metal, which reduces the grain size of the alloy, improving its strength and ductility. After processing, the alloy becomes more resistant to corrosion due to the formation of a more stable protective fi lm on its surface. The study [43] investigated the eff ect of thermal shocks on the microstructure, microhardness, and corrosion properties of VCrFeTa0.2W0.2 alloy with reduced activation. After thermal shocks, the content of diff erent phases in the alloy changed, microhardness increased, and corrosion resistance improved. The alloy demonstrated excellent properties under harsh environmental conditions, making it a promising material for nuclear construction. The studies conducted show that adding various elements, improving the methods of synthesis and processing of alloys, and optimizing the structure can improve the corrosion resistance of materials. Another
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