Journal
COATINGS
Volume 10, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/coatings10070604
Keywords
plasma immersion ion implantation; bipolar plate; corrosion resistance
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Funding
- Korea Institute of Industrial Technology [JA200009]
- National Research Council of Science & Technology (NST), Republic of Korea [JA200009] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Nitrogen was implanted into 316L stainless steel by plasma immersion ion implantation (PIII) for surface modification. Due to nitrogen implantation, the corrosion resistance and interfacial contact resistance (ICR) were improved compared to the bare 316L stainless steel. The improved corrosion resistance was attributed to the formation of the expanded austenite phase (gamma(N)). The phase formation was found to be closely related to the evolution of the (111) plane texture. The formation of gamma(N)is strongly related to applied bias voltages. When bias voltages were increased to 15 kV, the gamma(N)phase was partially decomposed due to the formation of excessive nitride, including the CrN phase. For the ICR, increased crystallite size is effective in reducing contact resistance, which might arise from a reduced number of the grain boundary with electron scattering. In particular, the applied bias voltage of 10 kV was the most effective to both corrosion resistance and ICR, and its performance satisfies the demand for a bipolar plate in the Polymer Electrolyte Membrane Fuel Cells (PEMFC).
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