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Stainless steels (AISI 316L) are carburized by Inductively coupled plasma using CH4 and Ar gas. The γc 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 γc 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 mΩcm 2 (AISI 316L) to about 20 mΩcm 2 . The sample carburized at 200 showed the best corrosion current density (6 μAcm 2 ).

The Contact Resistance and Corrosion Properties of Carburized 316L Stainless Steel