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Open AccessArticle

Effect of N+ Implantation on Surface Characteristics of 316L Stainless Steels for Bipolar Plate in PEMFC

1
Advanced Manufacturing Process R&D Group, Ulsan Regional Division, Korea Institute of Industrial Technology (KITECH), 55, Jongga-ro, Jung-gu, Ulsan 44313, Korea
2
Korea Shipbuilding & Offshore Engineering Co., Ltd., Bangeojinsunhwando-ro 1000, Dong-gu, Ulsan 44032, Korea
3
School of Materials Science & Engineering, University of Ulsan, 55-12, Techno saneop-ro, Nam-gu, Ulsan 44776, Korea
4
Bosung Trading&Engineering Co., Ltd., 55, Cheoyongsaneop 4-gil, Cheongnyang-eup, Ulju-gun, Ulsan 44776, Korea
*
Authors to whom correspondence should be addressed.
Coatings 2020, 10(7), 604; https://doi.org/10.3390/coatings10070604
Received: 30 May 2020 / Revised: 19 June 2020 / Accepted: 22 June 2020 / Published: 27 June 2020
(This article belongs to the Section Plasma Coatings, Surfaces & Interfaces)
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 (γN). The phase formation was found to be closely related to the evolution of the (111) plane texture. The formation of γN is strongly related to applied bias voltages. When bias voltages were increased to 15 kV, the γN 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).
Keywords: plasma immersion ion implantation; bipolar plate; corrosion resistance plasma immersion ion implantation; bipolar plate; corrosion resistance
MDPI and ACS Style

Kim, Y.-S.; Kim, D.-W.; Lee, I.-S.; Yoon, S.; Kim, D.; Jun, S.; Cha, B.-C. Effect of N+ Implantation on Surface Characteristics of 316L Stainless Steels for Bipolar Plate in PEMFC. Coatings 2020, 10, 604.

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