Corrosion Science and Technology

The Corrosion Science Society of Korea (한국재료부식학회)
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Effect of Micro-Alloying (C, V and Mo) on Corrosion Behaviors of 1Cr-bearing Ferritic Steel in CO2-Saturated Acidic Aqueous Solution

1 wt% Cr 첨가 페라이트계 강 내 미량 첨가된 합금원소(C, V, Mo)가 CO2 포화 산성 수용액 내 부식 거동에 미치는 영향

  • Seong Jun Yun (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Duck Bin Yun (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Hye Rin Bang (Department of Advanced Materials Engineering, Sunchon National University) ;
  • Wan Geun Kim (POSCO Technical Research Laboratories) ;
  • Sung Jin Kim (Department of Advanced Materials Engineering, Sunchon National University)
  • 윤성준 (순천대학교 신소재공학과) ;
  • 윤덕빈 (순천대학교 신소재공학과) ;
  • 방혜린 (순천대학교 신소재공학과) ;
  • 김완근 (POSCO 기술연구원) ;
  • 김성진 (순천대학교 신소재공학과)
  • Received : 2025.11.12
  • Accepted : 2025.12.16
  • Published : 2025.12.31
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Abstract

This study examined the effect of micro-alloying elements (C, V, and Mo) on the corrosion behavior of 1Cr-containing ferritic steel in a CO2-saturated acidic aqueous solution. A variety of experimental methods were employed, including microstructural analyses, electrochemical measurements, and surface examinations. The findings revealed that an increased addition of carbon (C) to this alloy system led to a higher fraction of coarse Fe3C and M7C3, which limited chromium (Cr) enrichment in the inner corrosion scale and caused the FeCO3 crystals on the outer surface to coarsen. These changes resulted in a greater susceptibility to long-term corrosion. In contrast, the addition of vanadium (V) markedly enhanced Cr enrichment in the inner layer and refined the FeCO3 crystals on the outer layer of the corrosion scale, leading to improved long-term corrosion resistance. Molybdenum (Mo) also contributed to enhanced corrosion resistance, similar to V, but during the early stages of corrosion, it exhibited much higher dissolution rates and showed a limited ability to form protective FeCO3 layers under acidic conditions, which may impede the full realization of its corrosion-resistant benefits.

Keywords

Acknowledgement

This paper was supported by Sunchon National University Glocal University Project Fund in 2025. (Grant number: 2025-0060).

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