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초고강도급 자동차용 강재 내 ε-carbide (Fe<sub>2.4</sub>C)가 부식 및 수소확산거동에 미치는 영향
박진성 ( Jin-seong Park ),윤덕빈 ( Duck Bin Yun ),성환구 ( Hwan Goo Seong ),김성진 ( Sung Jin Kim ) 한국부식방식학회 2021 Corrosion Science and Technology Vol.20 No.5
Effects of ε-carbide (Fe<sub>2.4</sub>C) on corrosion and hydrogen diffusion behaviors of ultra-strong steel sheets for automotive application were investigated using a number of experimental and analytical methods. Results of this study showed that the type of iron carbide precipitated during tempering treatments conducted at below A<sub>1</sub> temperatures had a significant influence on corrosion kinetics. Compared to a steel sample with cementite (Fe<sub>3</sub>C), a steel sample with ε-carbide (Fe<sub>2.4</sub>C) showed higher corrosion resistance during a long-term exposure to a neutral aqueous solution. In addition, the diffusion kinetics of hydrogen atoms formed by electrochemical corrosion reactions in the steel matrix with ε-carbide were slower than the steel matrix with cementite because of a comparatively higher binding energy of hydrogen with ε-carbide. These results suggest that designing steels with fine ε-carbide distributed uniformly throughout the matrix can be an effective technical strategy to ensure high resistance to hydrogen embrittlement induced by aqueous corrosion.