전해연마한 슈퍼오스테나이트 스테인리스강의 해수온도에 따른 전기화학적 특성 연구
Investigation of the Electrochemical Characteristics of Electropolished Super Austenite Stainless Steel with Seawater Temperature
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Electropolishing technology uses an electrochemical 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 °C, 60 °C, and 90 °C was reduced by 0.083 μA/cm2, 0.296 μA/cm2, and 0.341 μA/cm2, respectively. Pitting occurred in the mechanical polished specimen at 30 °C, but partial intergranular corrosion was observed in the electropolished specimen, and pitting occurred predominantly at both 60 °C and 90 °C. In addition, the damage depths of the electropolished specimen were shallower than those of mechanical polishing at 30 °C and 60 °C, but the opposite result was seen at 90 °C.
Abstract
Electropolishing technology uses an electrochemical 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 °C, 60 °C, and 90 °C was reduced by 0.083 μA/cm2, 0.296 μA/cm2, and 0.341 μA/cm2, respectively. Pitting occurred in the mechanical polished specimen at 30 °C, but partial intergranular corrosion was observed in the electropolished specimen, and pitting occurred predominantly at both 60 °C and 90 °C. In addition, the damage depths of the electropolished specimen were shallower than those of mechanical polishing at 30 °C and 60 °C, but the opposite result was seen at 90 °C.
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