[논문]Cr 첨가가 고망간강의 중성 수용액 환경 내 유동가속부식 거동에 미치는 영향

정영재; 박진성; 방혜린; 이순기; 최종교; 김성진

doi:10.14773/cst.2021.20.6.373

Cr 첨가가 고망간강의 중성 수용액 환경 내 유동가속부식 거동에 미치는 영향
Effect of Cr Addition to High Mn Steel on Flow-Accelerated Corrosion Behaviors in Neutral Aqueous Environments 원문보기

Corrosion science and technology, v.20 no.6, 2021년, pp.373 - 383

정영재 (순천대학교 신소재공학과) , 박진성 (순천대학교 신소재공학과) , 방혜린 (순천대학교 신소재공학과) , 이순기 (포스코 기술연구원) , 최종교 (포스코 기술연구원) , 김성진 (순천대학교 신소재공학과)

Abstract ▼ AI-Helper

The effect of Cr addition to high Mn steel on flow-accelerated corrosion (FAC) behavior in a neutral aqueous environment was evaluated. For comparison, two types of conventional ferritic steels (API X70 steel and 9% Ni steel) were used. A range of experiments (electrochemical polarization and impedance tests, weight loss measurement, and metallographic observation of corrosion scale) were conducted. This study showed that high Mn steel with 3% Cr exhibited the highest resistance to FAC presumably due to the formation of a bi-layer scale structure composed of an inner Cr enriched Fe oxide and an outer Mn substituted partially with Fe oxide on the surface. Although the high Mn steels had the lowest corrosion resistance at the initial corrosion stage due to rapid dissolution kinetics of Mn elements on their surface, the kinetics of inner scale (i.e. Cr enriched Fe oxide) formation on Cr-bearing high Mn steel was faster in dynamic flowing condition compared to stagnant condition. On the other hand, the corrosion scales formed on API X70 and 9% Ni steels did not provide sufficient anti-corrosion function during the prolonged exposure to dynamic flowing conditions.

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표/그림 (10)

그림 Fig. 1. Corrosion processes of the metal in (a) stagnant, (b) flow, and (c) flow with erodent environments [5]
표 Table 1. Chemical composition of the tested samples
그림 Fig. 2. LPR curves of the samples, measured after (a) 1 day, (b) 3 days, and (c) 14 days exposed to FAC environment, and (d) i_corr and MPY, obtained by curve-fitting to LPR data of the samples
표 Table 2. Several electrochemical parameters obtained by curve-fitting to LPR data of the samples
그림 Fig. 3. EIS Nyquist plots of the samples, measured after (a) 1 day, (b) 3 days, and (c) 14 days exposed to FAC environment, and (d) R_p (R_f + R_ct), obtained by curve-fitting to EIS data of the samples
표 Table 3. Several electrochemical parameters obtained by curve-fitting to EIS Nyquist plots of the samples
그림 Fig. 4. (a) Weight loss and (b) corrosion rate of the samples after exposure to FAC environment
그림 Fig. 5. Cross-section morphologies of (a) 24Mn, (b) 24Mn3Cr, (c) API X70, and (d) 9Ni after exposure to FAC environment for 14 days
그림 Fig. 6. EDS mapping analysis of a cross-sectional images of (a) 24Mn, (b) 24Mn3Cr, (c) API X70, and (d) 9Ni after exposure to FAC environment for 14 days
그림 Fig. 7. Schematic diagram illustrating the proposed corrosion mechanism of (a) 24Mn, (b) 24Mn3Cr, (c) API X70, and (d) 9Ni, respectively

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