Corrosion Science and Technology

The Corrosion Science Society of Korea (한국부식방식학회)
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General Corrosion Behavior of High Chromium Cast Iron in an Acid Solution

산성 용액에서 고크롬 주철의 전면 부식 거동

  • Lee, Jun-Seob (Materials Science and Engineering, Changwon National University) ;
  • Lee, Jun-Hyung (Materials Convergence and System Engineering, Changwon National University) ;
  • Oh, Jun-Seok (Materials Science and Engineering, Changwon National University) ;
  • Lee, Je-Hyun (Materials Science and Engineering, Changwon National University)
  • 이준섭 (국립창원대학교 신소재공학부) ;
  • 이준형 (국립창원대학교 소재융합시스템공학과) ;
  • 오준석 (국립창원대학교 신소재공학부) ;
  • 이재현 (국립창원대학교 신소재공학부)
  • Received : 2021.11.11
  • Accepted : 2021.11.22
  • Published : 2021.12.31
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Abstract

The effect of carbon addition on the general corrosion behavior of high-chromium cast iron (HCCI) was studied by a scanning electron microscope with energy dispersive spectroscopy (SEM-EDS) or electron back-scattered diffraction (EBSD), or electrochemical polarization techniques in 0.1 mol dm-3 H2SO4 + 0.05 mol dm-3 HCl at room temperature. The addition of 2.1-2.8 wt% carbon to HCCI increased the fraction of eutectic austenite and eutectic carbide phases, while that of HCCI decreased the fraction of the primary austenitic phase. Potentiostatic polarization of the HCCI at -0.35 VSSCE or 0.0 VSSCE resulted in preferential general corrosion of the primary austenitic or eutectic austenitic phases, respectively. The decrease in corrosion current density and the shift in noble corrosion potential direction with increasing carbon content in the HCCI indicated that the fraction and the chemical composition of austenitic (primary and eutectic) and carbide phases were strongly related to the general corrosion behavior of the HCCI.

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Acknowledgement

이 논문은 2021~2022년도 창원대학교 자율연구과제 연구비 지원으로 수행된 연구결과임

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