Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Effect of electropolishing process time on electrochemical characteristics in seawater for austenitic stainless steel

오스테나이트 스테인리스강의 해수에서 전기화학적 특성에 미치는 전해연마시간의 영향

  • 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)
  • 황현규 (목포해양대학교 대학원) ;
  • 신동호 (목포해양대학교 대학원) ;
  • 허호성 (목포해양대학교 대학원) ;
  • 김성종 (목포해양대학교 기관시스템공학부)
  • Received : 2022.08.19
  • Accepted : 2022.08.23
  • Published : 2022.08.31
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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

Acknowledgement

이 논문은 해양수산부 재원으로 해양수산과학기술진흥원의 지원을 받아 수행된 연구임(선박 배출 대기오염물질 동시저감 후처리시스템 실증 및 인증체계 구축).

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