An austenite 349 stainless steel was nitrided via nitrogen plasma. Glancing angle X-ray diffraction patterns suggest that the nitrided layer is amorphous. X-ray photoelectron spectroscopy analysis indicated that the plasma nitridation process produced bulk-type nitrides in the surface layer. In general, the nitrided layer was composed of iron oxide in the outer layer and chromium oxide in the inner layers. Contaminations of vanadium and tin were detected in the as-grown nitrided layer; these dissolved away after polarization. The influence of these contaminants on the corrosion resistance of the nitrided layer in polymer electrolyte membrane fuel cell (PEMFC) environments is not considered significant. The nitrided sample had a much higher contact resistance than the bare one and the contact resistance increased with the nitriding time. The high interfacial contact resistance values can be related to the thicker oxide film after plasma nitridation. The corrosion resistances obtained for the 1 h nitrided and bare stainless steels in simulated PEMFC environments were similar. The outmost nitrided layer dissolved after polarization in the PEMFC environments leaving a passive film (modified with nitrides), similar to that of bare stainless steel under the same conditions. The passive film thickness was 3.7 nm for nitrided steel in PEMFC cathode environment and 4.2 nm for nitrided steel in PEMFC anode environment.
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e-mail: heli.wang@nrel.gov
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April 2010
This article was originally published in
Journal of Fuel Cell Science and Technology
Research Papers
Plasma Nitrided Type 349 Stainless Steel for Polymer Electrolyte Membrane Fuel Cell Bipolar Plate—Part I: Nitrided in Nitrogen Plasma
Heli Wang,
e-mail: heli.wang@nrel.gov
Heli Wang
National Renewable Energy Laboratory
, 1617 Cole Boulevard, Golden, CO 80401
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Glenn Teeter,
Glenn Teeter
National Renewable Energy Laboratory
, 1617 Cole Boulevard, Golden, CO 80401
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John A. Turner
John A. Turner
National Renewable Energy Laboratory
, 1617 Cole Boulevard, Golden, CO 80401
Search for other works by this author on:
Heli Wang
National Renewable Energy Laboratory
, 1617 Cole Boulevard, Golden, CO 80401e-mail: heli.wang@nrel.gov
Glenn Teeter
National Renewable Energy Laboratory
, 1617 Cole Boulevard, Golden, CO 80401
John A. Turner
National Renewable Energy Laboratory
, 1617 Cole Boulevard, Golden, CO 80401J. Fuel Cell Sci. Technol. Apr 2010, 7(2): 021018 (7 pages)
Published Online: January 19, 2010
Article history
Received:
April 28, 2008
Revised:
April 10, 2009
Online:
January 19, 2010
Published:
January 19, 2010
Connected Content
A companion article has been published:
Plasma Nitrided Type 349 Stainless Steel for Polymer Electrolyte Membrane Fuel Cell Bipolar Plate—Part II: Nitrided in Ammonia Plasma
Citation
Wang, H., Teeter, G., and Turner, J. A. (January 19, 2010). "Plasma Nitrided Type 349 Stainless Steel for Polymer Electrolyte Membrane Fuel Cell Bipolar Plate—Part I: Nitrided in Nitrogen Plasma." ASME. J. Fuel Cell Sci. Technol. April 2010; 7(2): 021018. https://doi.org/10.1115/1.3178555
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