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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

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주제분류금속공학

초록

The effect of Cr addition to high Mn steel on flow-accelerated corrosion (FAC) behavior in a neutral aqueousenvironment was evaluated. For comparison, two types of conventional ferritic steels (API X70 steeland 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 studyshowed that high Mn steel with 3% Cr exhibited the highest resistance to FAC presumably due to the formationof a bi-layer scale structure composed of an inner Cr enriched Fe oxide and an outer Mn substitutedpartially with Fe oxide on the surface. Although the high Mn steels had the lowest corrosionresistance 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 indynamic flowing condition compared to stagnant condition. On the other hand, the corrosion scales formedon API X70 and 9% Ni steels did not provide sufficient anti-corrosion function during the prolonged exposureto dynamic flowing conditions.

Abstract

The effect of Cr addition to high Mn steel on flow-accelerated corrosion (FAC) behavior in a neutral aqueousenvironment was evaluated. For comparison, two types of conventional ferritic steels (API X70 steeland 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 studyshowed that high Mn steel with 3% Cr exhibited the highest resistance to FAC presumably due to the formationof a bi-layer scale structure composed of an inner Cr enriched Fe oxide and an outer Mn substitutedpartially with Fe oxide on the surface. Although the high Mn steels had the lowest corrosionresistance 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 indynamic flowing condition compared to stagnant condition. On the other hand, the corrosion scales formedon API X70 and 9% Ni steels did not provide sufficient anti-corrosion function during the prolonged exposureto dynamic flowing conditions.

참고문헌 (29)

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