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http://dx.doi.org/10.5695/JKISE.2015.48.3.87

Corrosion Properties of Carbon-Coated Metallic Bipolar Plate for PEMFC  

Jang, Dong-Su (Department of Materials Science and Engineering, Seoul National University)
Lee, Jung-Joong (Department of Materials Science and Engineering, Seoul National University)
Publication Information
Journal of the Korean institute of surface engineering / v.48, no.3, 2015 , pp. 87-92 More about this Journal
Abstract
Carbon thin films were deposited on STS 316L sheets by inductively coupled plasma enhanced magnetron sputtering with or without substrate bias voltage. Typical Raman spectrum for amorphous diamond-like carbon (DLC) was obtained, and the interfacial contact resistance (ICR) was measured to show its conductive nature. The electrochemical impedance spectroscopy (EIS) was used to investigate the corrosion mechanism of the carbon coating under the polymer electrolyte membrane fuel cell (PEMFC) condition. According to the pore-corrosion mechanism, the electrolyte penetrates the carbon coating through the pores and reacts with the substrate. As the substrate corrosion proceeds, the pore enlargement occurs and the surface area of the substrate exposed to the electrolyte. Applicability of the carbon coating for the PEMFC bipolar plate was evaluated by potentiodynamic polarization experiments. Finally, an adhesion problem was briefly considered.
Keywords
Carbon film; Sputtering; Bipolar plate; PEMFC; EIS; Corrosion; Porosity; ICR;
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