期刊
DIAMOND AND RELATED MATERIALS
卷 118, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.diamond.2021.108503
关键词
Stainless steel bipolar plates; Titanium bipolar plate; Proton-exchange membrane fuel cell; Corrosion resistance; Amorphous-carbon film
类别
资金
- International Cooperation Project in Chinese Ministry of Science and Technology [2014DFR50450]
- Shaanxi Provincial Natural Science Basic Research Program [2019JQ-940, 2019JM-619]
- open fund of key laboratory of materials preparation and protection for harsh environment (Nanjing University of Aeronautics And Astronautics), Ministry of Industry and Information Technology [xca19013-01]
This study experimentally analyzed the corrosion resistance of metal bipolar plates and the performance of surface-treated carbon films at different voltages, revealing variations in corrosion resistance under different voltage conditions.
Metal bipolar plates (BPs) typically corrode and form a high-resistivity passivation film in the environment of proton-exchange membrane fuel cells (PEMFCs). Surface modification is urgently needed to improve the corrosion resistance and surface conductivity of metal BPs, and their performance is typically closely related to the substrate type and coating characteristics. In this work, the commonly used metal BP substrates SS316L and Grade 2 Titanium (TA2) were selected, and an amorphous carbon (alpha-C) film was prepared using DC balanced magnetron sputtering. The passivation film defect density and corrosion resistance of SS316L and TA2 were analyzed by electrochemical and Mott-Schottky tests. The influence of the type of substrate on the microscopic morphology and phase composition of the alpha-C film was systematically studied, and the corrosion resistance, highpotential (1.4 V (SCE)) corrosion, and surface contact resistance of the film were also analyzed. It was found that the film has excellent corrosion resistance at 0.6 V. However, at 1.4 V (SCE), the film on SS316L showed severe local corrosion, while the TA2 sample did not show any local corrosion. This demonstrates that the corrosion resistance of the BPs is dominated by the film at 0.6 V; while at high corrosion potentials, the corrosion resistance of the substrate plays a decisive role.
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