Corrosion Science and Technology

  • 제20권6호
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  • Pages.373-383
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  • 2021
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  • 1598-6462(pISSN)
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  • 2288-6524(eISSN)
한국부식방식학회 (The Corrosion Science Society of Korea)
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Cr 첨가가 고망간강의 중성 수용액 환경 내 유동가속부식 거동에 미치는 영향

Effect of Cr Addition to High Mn Steel on Flow-Accelerated Corrosion Behaviors in Neutral Aqueous Environments

  • 정영재 (순천대학교 신소재공학과) ;
  • 박진성 (순천대학교 신소재공학과) ;
  • 방혜린 (순천대학교 신소재공학과) ;
  • 이순기 (포스코 기술연구원) ;
  • 최종교 (포스코 기술연구원) ;
  • 김성진 (순천대학교 신소재공학과)
  • Jeong, Yeong Jae (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Park, Jin Sung (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Bang, Hye Rin (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Lee, Soon Gi (POSCO Technical Research Laboratories) ;
  • Choi, Jong Kyo (POSCO Technical Research Laboratories) ;
  • Kim, Sung Jin (Department of Advanced Materials Engineering, Sunchon National University)
  • 투고 : 2021.11.16
  • 심사 : 2021.11.24
  • 발행 : 2021.12.31
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초록

The effect of Cr addition to high Mn steel on flow-accelerated corrosion (FAC) behavior in a neutral aqueous environment was evaluated. For comparison, two types of conventional ferritic steels (API X70 steel and 9% Ni steel) were used. A range of experiments (electrochemical polarization and impedance tests, weight loss measurement, and metallographic observation of corrosion scale) were conducted. This study showed that high Mn steel with 3% Cr exhibited the highest resistance to FAC presumably due to the formation of a bi-layer scale structure composed of an inner Cr enriched Fe oxide and an outer Mn substituted partially with Fe oxide on the surface. Although the high Mn steels had the lowest corrosion resistance at the initial corrosion stage due to rapid dissolution kinetics of Mn elements on their surface, the kinetics of inner scale (i.e. Cr enriched Fe oxide) formation on Cr-bearing high Mn steel was faster in dynamic flowing condition compared to stagnant condition. On the other hand, the corrosion scales formed on API X70 and 9% Ni steels did not provide sufficient anti-corrosion function during the prolonged exposure to dynamic flowing conditions.

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