Corrosion Science and Technology

  • 제23권4호
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  • Pages.310-314
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  • 2024
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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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산성 용액에서 전기화학적 특성과 침지 시간에 따른 고크롬 백주철의 부식 거동

Time-Dependent Corrosion Behavior of High Chromium White Cast Iron in an Acidic Solution

  • Jun-Seob Lee (Department of Materials Convergence and System Engineering, Changwon National University) ;
  • Ochgerel Baasanjav (Department of Materials Convergence and System Engineering, Changwon National University) ;
  • Jun-Seok Oh (i-Casting Tech Ltd.) ;
  • Je-hyun Lee (Department of Materials Convergence and System Engineering, Changwon National University)
  • 투고 : 2024.07.10
  • 심사 : 2024.07.23
  • 발행 : 2024.08.30
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초록

The corrosion behavior of high chromium white cast iron was studied in 0.5 mol dm-3 H2SO4 + 0.01 mol dm-3 HCl solution over time through electrochemical and immersion experiments. Potentiodynamic and potentiostatic polarizations revealed active-passivation transition behavior, with critical current densities observed at -0.27 VSSE and 0.00 VSSE, repectively. The former potential showed preferential dissolution of primary γ phases, while the latter one showed preferential dissolution of eutectic γ phases. Immersion tests showed an exponential increase in corrosion rate, with significant acceleration observed around 1000 seconds due to the onset of eutectic γ phase dissolution. Over a 24-hour immersion period, both γ phases exhibited extensive corrosion, leaving carbides largely intact. These findings elucidate distinct corrosion behaviors of high chromium white cast iron in acidic environments, providing critical insights into material performance evaluation. Understanding these mechanisms is essential for predicting the longevity and durability of materials in corrosive conditions, thereby informing better material design and application strategies.

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과제정보

이 논문은 2024년도 정부(산업통상자원부)의 재원으로 한국에너지기술평가원의 지원을 받아 수행된 연구임(20214000000480, 청정가스복합화력발전 핵심요소기술 및 국산화 전문인재양성). 이 논문은 2024학년도 국립창원대학교 중견교원 연구 지원 사업 연구비에 의하여 연구되었음.

참고문헌

  1. C. K. Kim, S. Lee, and J. Y. Lee, Wear Resistance and Fracture Toughness of Heat-treated Duo-cast Materials Composed of High-Chromium White Cast Iron and Low-Chromium Steel, Korea Journal of Metals and Materials, 42, 877 (2004). Doi: http://kjmm.or.kr/past/view_kiss.asp?a_key=2382457
  2. R. Lee, and Y. S. Kim, Effect of Heat treatment on Hardness and Corrosion Resistance of Super Cast Iron, Korean Journal of Metals and Materials, 52, 511 (2014). Doi: http://kjmm.or.kr/past/view_kiss.asp?a_key=3248622
  3. I. Chakrabarty, and A. Basak, Structural study of Cr-Mn-Cu white cast irons, Journal of Materials Science Letters, 6, 1399 (1987). Doi: https://link.springer.com/content/pdf/10.1007/BF01689301.pdf
  4. J. S. Lee, J. H. Lee, J. S. Oh, and J. H. Lee, General Corrosion Behavior of High Chromium Cast Iron in an Acid Solution, Corrosion Science and Technology, 20, 367 (2021). Doi: https://doi.org/10.14773/cst.2021.20.6.367
  5. J. S. Lee, J. H. Lee, Y.-J. Lee, J. S. Oh, J.-G. Kim and J. H. Lee, Stir-Accelerated Corrosion Test of High Chromium Cast Iron for Application in Slurry Pumps, Corrosion Science and Technology, 21, 418 (2022). Doi: https://doi.org/10.14773/cst.2022.21.5.418
  6. J. S. Lee, J. H. Lee, S.-Y. Rho, Y.-H. Lee, Y.-J. Lee, J. S. Oh, and J. H. Lee, 23. Preferential dissolution behaviour of the austenite phase in Fe-27Cr-xC high chromium cast iron, RSC Advances, 13, 19220 (2023). Doi: https://doi.org/10.1039/d3ra01015e
  7. J.-S. Oh, Y.-G. Song, B.-G. Choi, C. Bhamornsut, R. Nakkuntod, C.-Y. Jo and J.-H. Lee, Effect of Dendrite Fraction on the M23C6 Precipitation Behavior and the Mechanical Properties of High Cr White Irons, Metals, 11, 1576 (2021). Doi: https://doi.org/10.3390/met11101576