The effect of high-energy heating by highfrequency currents on dislocations in conditions of increased corrosion resistance

The relationship between microstructural defects and corrosion resistance of metallic alloys has long been a subject of study in materials science and condensed matter physics. This study investigates the effect of high-energy heating using high-frequency currents on the dynamics of dislocations in metallic materials under conditions of increased corrosion resistance. High frequency current treatment causes rapid localized heating, creating temperature gradients and mechanical stresses that alter the dislocation structure. Two commercial alloys were studied in the experiments: an aluminum alloy susceptible to pitting corrosion and an austenitic stainless steel susceptible to intergranular corrosion. Microstructural and corrosion studies were performed using transmission electron microscopy, X-ray diffraction, and electron backscatter diffraction. The results show that high-energy heating significantly reduces the dislocation density and promotes their clustering, which reduces stress concentration and improves microstructural homogeneity. At the same time, the formation of a stable oxide layer accelerated by thermal activation improves passivation and electrochemical stability in aggressive environments. The synergistic effect of dislocation modification and surface oxidation results in a significant increase in corrosion resistance, especially in materials susceptible to pitting and intercrystalline corrosion. High-frequency current treatments can also be used to study the physical basis of the electroplastic effect and to heal microcracks in metals and alloys. The studies highlight the potential of high-frequency current treatment as a dual-purpose method for optimizing both the mechanical integrity and corrosion performance of structural alloys, suggesting promising applications in the aerospace, marine and energy industries, where durability in harsh environments is critical.

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