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Received: January 04, 2023; Revised: January 12, 2023; Accepted: January 13, 2023
Abstract: Electropolishing technology uses an electr℃hemical reaction and improves surface roughness, glossiness, and corrosion resistance. In this investigation, electropolishing was performed to improve the corrosion resistance of super austenitic stainless steel. As a result of electropolishing, surface roughness (0.16 μm) was improved by about 76.5% compared to mechanical polishing (0.68 μm). In addition, the electropolished surface was smooth because the average and variance values of the depth histogram were small. Tafel analysis was performed after a potentiodynamic polarization experiment with seawater temperature, and the microstructure was compared and analyzed. The corrosion current density at 30 ℃, 60 ℃, and 90 ℃ was reduced by 0.083 μA/cm2, 0.296 μA/cm2, and 0.341 μA/cm2, respectively. Pitting ℃curred in the mechanical polished specimen at 30 °C, but partial intergranular corrosion was observed in the electropolished specimen, and pitting ℃curred predominantly at both 60 ℃ and 90 ℃. In addition, the damage depths of the electropolished specimen were shallower than those of mechanical polishing at 30 ℃ and 60 ℃, but the opposite result was seen at 90 ℃.