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Open AccessArticle

Corrosion Behavior and Conductivity of TiNb and TiNbN Coated Steel for Metallic Bipolar Plates

1
Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China
2
Shanxi Research Institute for Clean Energy, Tsinghua University, Taiyuan 030032, China
3
Advanced Technology Department, SAIC Motor Corporation Limited, Shanghai 201804, China
4
Department of Energy Conversion and Storage, Technical University of Denmark, 2800 Lyngby, Denmark
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2019, 9(12), 2568; https://doi.org/10.3390/app9122568
Received: 10 March 2019 / Revised: 23 May 2019 / Accepted: 30 May 2019 / Published: 24 June 2019
(This article belongs to the Special Issue Advances in Organic Corrosion Inhibitors and Protective Coatings)
To improve corrosion resistance and electronic conductivity of bipolar plates for proton exchange membrane fuel cell (PEMFC), coatings of TiNb and TiNbN on 316L stainless steel (SS) were prepared by magnetron sputtering. X-ray diffraction (XRD) measurements confirmed the existence of metallic nitrides in the TiNbN coating. Scanning electron microscope (SEM) tests showed that the deposited coatings provided smooth surfaces. Further electrochemical measurements indicated that the corrosion resistance of TiNb coating was significantly higher than that of substrate. At 0.19 V vs MSE, the long-term stabilized current density of TiNb/316L SS was lower than 1 μA·cm−2. The interfacial contact resistance (ICR) values between coating and carbon paper suggested that TiNb and TiNbN films had better contact conductivity than 316L SS substrate. In conclusion, TiNb coated 316L SS metallic bipolar plate material is a promising option for PEMFC. View Full-Text
Keywords: coating; metallic bipolar plate; PEMFC; TiNb; TiNbN coating; metallic bipolar plate; PEMFC; TiNb; TiNbN
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MDPI and ACS Style

Shi, K.; Li, X.; Zhao, Y.; Li, W.-W.; Wang, S.-B.; Xie, X.-F.; Yao, L.; Jensen, J.O.; Li, Q.-F. Corrosion Behavior and Conductivity of TiNb and TiNbN Coated Steel for Metallic Bipolar Plates. Appl. Sci. 2019, 9, 2568.

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