Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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Effect of ε-carbide (Fe2.4C) on Corrosion and Hydrogen Diffusion Behaviors of Automotive Ultrahigh-Strength Steel Sheet

초고강도급 자동차용 강재 내 ε-carbide (Fe2.4C)가 부식 및 수소확산거동에 미치는 영향

  • Park, Jin-seong (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Yun, Duck Bin (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Seong, Hwan Goo (POSCO Technical Research Laboratories) ;
  • Kim, Sung Jin (Department of Advanced Materials Engineering, Sunchon National University)
  • 박진성 (순천대학교 신소재공학과) ;
  • 윤덕빈 (순천대학교 신소재공학과) ;
  • 성환구 (포스코 기술연구원) ;
  • 김성진 (순천대학교 신소재공학과)
  • Received : 2021.09.30
  • Accepted : 2021.10.15
  • Published : 2021.10.31
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Abstract

Effects of ε-carbide (Fe2.4C) on corrosion and hydrogen diffusion behaviors of ultra-strong steel sheets for automotive application were investigated using a number of experimental and analytical methods. Results of this study showed that the type of iron carbide precipitated during tempering treatments conducted at below A1 temperatures had a significant influence on corrosion kinetics. Compared to a steel sample with cementite (Fe3C), a steel sample with ε-carbide (Fe2.4C) showed higher corrosion resistance during a long-term exposure to a neutral aqueous solution. In addition, the diffusion kinetics of hydrogen atoms formed by electrochemical corrosion reactions in the steel matrix with ε-carbide were slower than the steel matrix with cementite because of a comparatively higher binding energy of hydrogen with ε-carbide. These results suggest that designing steels with fine ε-carbide distributed uniformly throughout the matrix can be an effective technical strategy to ensure high resistance to hydrogen embrittlement induced by aqueous corrosion.

Keywords

Acknowledgement

This work was supported by a research promotion program of SCNU.

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