오스테나이트 스테인리스강의 해수에서 전기화학적 특성에 미치는 전해연마시간의 영향

• Published in: Biuletyn Uniejowski Vol. 55; no. 4; pp. 236 - 246
• Main Authors: 황현규(Hyun-Kyu Hwang), 신동호(Dong-Ho Shin), 허호성(Ho-Seong Heo), 김성종(Seong-Jong Kim)
• Format: Journal Article
• Language: Korean
• Published: 한국표면공학회 2022
• Subjects: 기계공학; Surface roughness; UNS S31603; Potentiodynimic polarization; EIS; Electropolishing
• ISSN: 1225-8024; 2299-8403; 2288-8403
• DOI: 10.5695/JSSE.2022.55.4.236

Electropolishing is a surface finishing treatment that compensates for the disadvantages of the mechanical polishing process. It not only has a smooth surface, but also improves corrosion resistance. Therefore, the purpose of this investigation is to examine the corrosion resistance and electrochemical characteristics in seawater of UNS S31603 with electropolishing process time. The roughness improvement rate after electropolishing was improved by about 78% compared to before polishing, indicating that the electropolishing is effective. As a result of potential measuring of mechanical polishing and electropolishing, the potential of electropolishing was nobler than the mechanical polishing condition. As a result of calculating the corrosion current density after potentiodynamic polarization experiment with electropolishing conditions, the corrosion current density of mechanical polishing was about 6.4 times higher than that of electropolishing. After potentiodynamic polarization experiment with electropolishing conditions, the maximum damage depth of mechanical polishing was about 2.2 times higher than that of electropolishing(7 minutes). In addition, the charge transfer resistance of the specimen electropolished for 7 minutes was the highest, indicating improved corrosion resistance.