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Degradation of the Tensile Properties of an Au-Coated 316L Stainless Steel Bipolar Plate in a Fuel Cell Stack

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Abstract

Cost reduction for fuel cell stainless steel bipolar plate (BPP)’s Au-coating requires in depth understanding of its corrosion behavior. To this end, this paper explores the degradation of the tensile properties of an Au-coated 316L stainless steel bipolar plate in a real fuel cell stack. 4 BPPs were randomly chosen and removed from a stack that had run for 1600 h and, along with 2 pristine BPPs, were subsequently tested for surface morphology and tensile properties. Results suggest that (1) Pristine BPPs have initial pinhole flaws on the surface, whereas corroded BPPs have punctate (on O2 side) and continual (on H2 side) corrosions. (2) The tensile ultimate elongation for a BPP significantly decreases after corrosion on both O2 and H2 sides. (3) The degradation of tensile properties is attributed to primary cell effect.

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Authors and Affiliations

  1. SAIC Motor Corporation Limited, 200041, Shanghai, P.R. China

    Cheng Zhang, Qi Feng & Li Yao

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  1. Cheng Zhang
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  2. Qi Feng
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  3. Li Yao
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Correspondence to Li Yao.

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Cheng Zhang, Feng, Q. & Yao, L. Degradation of the Tensile Properties of an Au-Coated 316L Stainless Steel Bipolar Plate in a Fuel Cell Stack. Prot Met Phys Chem Surf 55, 535–538 (2019). https://doi.org/10.1134/S2070205119030298

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  • DOI: https://doi.org/10.1134/S2070205119030298

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