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Intergranular passivation of the TiC coating for enhancing corrosion resistance and surface conductivity in stainless-steel bipolar plates

  • Metals & corrosion
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Abstract

Stainless-steel bipolar plates (BPPs) are of great significance in low-cost, easily processable, lightweight proton exchange membrane fuel cells (PEMFCs) despite the challenge presented by corrosion in protective coatings. Localized corrosion along the grain boundaries in a crystal film is common, but few preventive measures have been developed so far. Thus, we propose a novel strategy using a tantalum (Ta) and carbon (C) co-modification to improve the chemical stability of titanium carbide (TiC)-based coatings (Cr/Ta/TiC/C). During the film growth, the subjacent Ta atoms were thermally diffused throughout the columnar structure of TiC and reacted with the C layer. The reaction product, i.e., TaC, acted as a chemical passivator to the grain boundary. Combined with the C capping layer, these functional layers synergistically suppressed any localized corrosion. Therefore, corrosion current densities within the United States Department of Energy’s technical recommendations were achieved in both potentiostatic and potentiodynamic polarization. Meanwhile, by controlling the Ta metal dispersion, the interfacial contact resistance between the multilayer structure and the carbon paper can be reduced to 7.1 mΩ·cm−2 at a compaction force of 140 N·cm−2. The substantial improvement in the corrosion resistance and conductivity of BPP places our work among the most efficient anticorrosion systems in PEMFC applications reported so far.

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Acknowledgement

This work is supported by the National Natural Science Foundation of China (No. 51902054 and No. 51702051) and Natural Science Foundation of Guangdong province (Grant No. 2017A030313307).

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Authors and Affiliations

  1. School of Materials Science and Hydrogen Energy, Foshan University, Foshan, 528000, China

    Jingling Li, Zeling Xu, Xinzhou Ma, Lingyan Weng & Cuiyin Liu

  2. Guangdong Key Laboratory for Hydrogen Energy Technologies, Foshan, 528000, China

    Jingling Li, Zeling Xu, Xinzhou Ma, Lingyan Weng & Cuiyin Liu

  3. CAS Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, China

    Jingling Li, Zeling Xu, Yujian Li & Jiamei Mo

  4. Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou,, 510640, China

    Jingling Li, Zeling Xu, Yujian Li & Jiamei Mo

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  1. Jingling Li
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Li, J., Xu, Z., Li, Y. et al. Intergranular passivation of the TiC coating for enhancing corrosion resistance and surface conductivity in stainless-steel bipolar plates. J Mater Sci 56, 8689–8703 (2021). https://doi.org/10.1007/s10853-020-05733-w

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