[논문]산성 용액에서 고크롬 주철의 전면 부식 거동

이준섭; 이준형; 오준석; 이재현

doi:10.14773/cst.2021.20.6.367

[국내논문] 산성 용액에서 고크롬 주철의 전면 부식 거동
General Corrosion Behavior of High Chromium Cast Iron in an Acid Solution 원문보기

Corrosion science and technology, v.20 no.6, 2021년, pp.367 - 372

이준섭 (국립창원대학교 신소재공학부) , 이준형 (국립창원대학교 소재융합시스템공학과) , 오준석 (국립창원대학교 신소재공학부) , 이재현 (국립창원대학교 신소재공학부)

Abstract ▼ AI-Helper

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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표/그림 (8)

표 Table 1. Chemical compositions of high chromium cast irons (wt%)
그림 Fig. 1. Optical microscopic images of high chromium cast iron with different carbon content; (a) 2.1 wt%, (b) 2.4 wt%, and (C) 2.8 wt%
그림 Fig. 2. Back-scattered electron images and SEM-EDS elemental mapping images of high chromium cast iron with different carbon content; (a) 2.1 wt%, (b) 2.4 wt%, and (C) 2.8 wt%
그림 Fig. 3. EBSD phase map images of high chromium cast iron with different carbon content; (a) 2.1 wt%, (b) 2.4 wt%, and (C) 2.8 wt%
$Fig. 4. Phase fraction of austenite and chromium carbide as a function of carbon content in high chromium cast iron$ 그림 Fig. 4. Phase fraction of austenite and chromium carbide as a function of carbon content in high chromium cast iron
그림 Fig. 5. Potentiodynamic polarization curves of high chromium cast iron in 0.1 mol dm^-3 H₂SO₄ + 0.05 mol dm^-3 HCl
그림 Fig. 7. Optical microscopic images of high chromium cast iron with fifferent carbon content after potentiostatic polarization at (a) -0.35 V_SSCE or (b) 0.0 V_SSCE for 600 s in 0.1 mol dm^-3 H₂SO₄ + 0.05 mol dm^-3 HCl
그림 Fig. 6. (a) corrosion potential, (b) corrosion current density, and (c) critical current density as a function of the carbon content of high chromium cast iron calculated from the potentiodynamic polarization curves shown in Fig. 5

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