The Contact Resistance and Corrosion Properties of Carburized 316L Stainless Steel
침탄된 316L 스테인리스 강의 접촉저항 및 내식 특성
홍원혁;고석진;장동수;이정중;
Hong, Wonhyuk;Ko, Seokjin;Jang, Dong-Su;Lee, Jung Joong;
서울대학교 재료공학부;
Department of Materials Science and Engineering, Seoul National University;
DOI : 10.5695/JKISE.2013.46.5.192
Stainless steels (AISI 316L) are carburized by Inductively coupled plasma using $CH_4$ and Ar gas. The ${gamma}_c$ phase(S-phase) is formed on the surface of stainless steel after carburizing process. The XRD peak of carburized samples is shifted to lower diffracting angle due to lattice expansion. Overall, the thickness of ${gamma}_c$ phase showed a linear dependence with respect to increasing temperature due to the faster rate of diffusion of carbon. However, at temperatures above 500, the thickness data deviated from the linear trend. It is expected that the deviation was caused from atomic diffusion as well as other reactions that occurred at high temperatures. The interfacial contact resistance (ICR) and corrosion resistance are measured in a simulated proton exchange membrane fuel cell (PEMFC) environment. The ICR value of the carburized samples decreased from 130 $m{Omega}cm^2$ (AISI 316L) to about 20 $m{Omega}cm^2$. The sample carburized at 200 showed the best corrosion current density (6 ${mu}Acm^{-2}$).
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