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High-temperature characteristics and electrical properties of CrN-coated and Mn/Cu/CrN-coated 430 stainless steel for solid oxide fuel cell metal interconnects

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Abstract

To limit the growth of oxides with low electrical conductivity and to suppress the inter-diffusion of elements between coating and substrate, an additional CrN sublayer is pre-deposited by arc ion plating. The Mn/Cu layers are electrodeposited in an aqueous solution. The results show that the CrN layer is about 2 µm and decomposes rapidly at 750 °C, and only Cr2N and Cr2O3 are detected after 1 h. The inner layer of Cr2N is not entirely decomposed after 100 h, and little Fe from the substrate diffuses into the CrN layer. When Mn/Cu-coated 430 stainless steel (SS) oxidized for 10 h, a mass of Fe-rich oxides are found in the oxide layer. For Mn/Cu/CrN-coated 430 SS, Cr2O3 and Cr2N bilayer structure and an internal oxidation zone containing some gaseous nitrogen are found near the interface. After oxidation for 10 h, area-specific resistance (ASR) of Mn/Cu-coated 430 SS is the smallest among the three oxide coatings. The ASR of the CrN layer and Mn/Cu/CrN layer oxidized for 10 h is very high. After 100 h, a part of Cr2N is oxidized into the Cr2O3 layer, and the ASR of the CrN layer decreases.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (52001142, 51801077), Research Fund of Jiangsu University of Science and Technology (1624821607-5), and Open Foundation of Zhenjiang Key Laboratory for High Technology Research on Marine Functional Films (ZHZ2019012).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Jiangsu, 212003, China

    Y. Shao, S. Y. Mao, T. Yin, P. Y. Guo, Y. X. Wang, W. N. Cui & L. L. Yang

  2. School of Naval Architecture and Ocean Engineering, Jiangsu University of Science and Technology, Jiangsu, 212003, China

    Y. Z. Li

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Contributions

YS, PYG and YXW: Writing the original draft and editing. SYM, WNC, and TY: Data curation, Test, and Methodology. LLY and YZL: Funding acquisition and review and editing.

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Correspondence to P. Y. Guo, Y. X. Wang or Y. Z. Li.

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Shao, Y., Mao, S.Y., Yin, T. et al. High-temperature characteristics and electrical properties of CrN-coated and Mn/Cu/CrN-coated 430 stainless steel for solid oxide fuel cell metal interconnects. J Mater Sci: Mater Electron 33, 16197–16209 (2022). https://doi.org/10.1007/s10854-022-08509-x

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