PEM Fuel Cell Separator with Thermally Nitrided Low Carbon Steel

Abstract:

The separator is one of the most important parts in PEM fuel cells. Stainless steels are widely used as separator for its good mechanical properties and mass production. However, for a good chemical compatibility, stainless steels need to have high chromium content or surface treatment, which makes separator high cost. Low cost of separator is important for commercial use. In this study, conventional low carbon steel is used as base metal of separator. Low carbon steel is low at cost, but has poor chemical properties for separator. For a good corrosion resistance, low carbon steel needs to be surface treated. To make a uniform surface treated layer on low carbon steel, chromium is conventionally electroplated on the steel and thermally nitrided. Surface treated low carbon steel is investigated using microstructure and element analysis tools. Interfacial contact resistance and polarization test is applied for the properties of fuel cell separator. The results show that chromium nitrided layer uniformly formed on low carbon steel. And the surface treated steel showed a good corrosion resistance as a separator.

• Periodical: Materials Science Forum (Volumes 654-656)
• Pages: 1823-1825
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.654-656.1823
• Online since: June 2010
• Authors: Dae Geun Nam, Chang Yong Choi, Jae Ho Jang, Young Do Park, Nam Hyun Kang
• Keywords: Bipolar Plate, Carbon Steel, Chromium Nitride, PEM Fuel Cell

References

[1] EGG Services, Fuel Cell Handbook, 5th ed., U.S. Department of Energy, Morgatown, 2000, pp.1-1.

[2] D.P. Davies, P.L. Adcock, M. Turpin, S.J. Rowen, J. Appl. Electrochem. 30 (2000) 101.

[3] I. Masaru, J. Korean Soc. Heat Treat. 14 (2001) 179.