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http://dx.doi.org/10.5695/JSSE.2022.55.4.236

Effect of electropolishing process time on electrochemical characteristics in seawater for austenitic stainless steel  

Hwang, Hyun-Kyu (Graduate school, Mokpo national maritime university)
Shin, Dong-Ho (Graduate school, Mokpo national maritime university)
Heo, Ho-Seong (Graduate school, Mokpo national maritime university)
Kim, Seong-Jong (Division of marine engineering, Mokpo national maritime university)
Publication Information
Journal of the Korean institute of surface engineering / v.55, no.4, 2022 , pp. 236-246 More about this Journal
Abstract
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.
Keywords
Electropolishing; Surface roughness; UNS S31603; Potentiodynimic polarization; EIS;
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