Surface Properties of Chromium Nitrided Carbon Steel as Separator for PEMFC

Title & Authors
Surface Properties of Chromium Nitrided Carbon Steel as Separator for PEMFC
Choi, Chang-Yong; Kang, Nam-Hyun; Nam, Dae-Geun;

Abstract
Separator of stack in polymer electrolyte membrane fuel cell (PEMFC) is high cost and heavy. If we make it low cost and lighter, it will have a great ripple. In this study, low carbon steel is used as base metal of separator because the cost of low carbon steel is very cheaper commercial metal material than stainless steels, which is widely used as separator. Low carbon steel has not a good corrosion resistance. In order to improve the corrosion resistance and electrolytic conductivity, low carbon steel needs to be surface treated. We made Chromium electroplated layer of $\small{5{\mu}m}$, $\small{10{\mu}m}$ thickness on the surface of low carbon steel and it was nitrided for 2 hours at $\small{1000^{\circ}C}$ in a furnace with 100 torr nitrogen gas pressure. Cross-sectional and surface microstructures of surface treated low carbon steel are investigated using SEM. And crystal structures are investigated by XRD. Interfacial contact resistance and corrosion tests were considered to simulate the internal operating conditions of PEMFC stack. The corrosion test was performed in 0.1 N $\small{H_2SO_4}$ + 2 ppm $\small{F^-}$ solution at $\small{80^{\circ}C}$. Throughout this research, we try to know that low carbon steel can be replaced stainless steel in separator of PEMFC.
Keywords
PEMFC;Nitriding;Carbon steel;Separator;Cr plating;
Language
Korean
Cited by
1.
해수 환경 하에서 304 스테인리스강의 캐비테이션 조건에 따른 특성 평가,장석기;정상옥;한민수;김성종;

한국표면공학회지, 2012. vol.45. 6, pp.278-283
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Electrochemical characteristics under cavitation-erosion for STS 316L in seawater, Materials Research Bulletin, 2014, 58, 244
2.
Characteristics Evaluation with Cavitation Condition of 304 Stainless Steel in Seawater Environment, Journal of the Korean institute of surface engineering, 2012, 45, 6, 278
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