Increase in the corrosion resistance of stainless steel bipolar plates by the formation of thermally-induced Cr-nitride Online publication date: Mon, 20-Jun-2016
by Seok Hee Lee; Sung Pil Woo; You Na Lee; Young Soo Yoon
International Journal of Nanotechnology (IJNT), Vol. 13, No. 4/5/6, 2016
Abstract: Cr-nitride layer is formed on the surface of Cr-electroplated stainless steel to use metallic bipolar plates of polymer electrolyte membrane fuel cell (PEMFC). The dense and continuous Cr-nitride layer is confirmed by scanning electron microscope (SEM) results. The corrosion resistance results in aggressive environments of PEMFC reveal that the corrosion current density of 0.5 μA cm−2 and 0.5 μA cm−2 are presented in anodic and cathodic environments of PEMFC, respectively. The highest protective efficiency of 99.9% is recorded in the cathodic condition. The dense Cr-nitride layer provides sufficient corrosion resistance. Moreover, the interfacial contact resistance (ICR) of Cr-nitride layer is significantly decreased up to 15 mΩ cm−2 compared with pure stainless steel and the ICR is maintained after corrosion tests. This analysis indicates that the improvement is originating solely from dense Cr-nitride layer on the surface.
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