Effects of pH value and temperature on the corrosion behavior of a Ta2N nanoceramic coating in simulated polymer electrolyte membrane fuel cell environment |
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| Affiliation: | 1. Department of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao Street, Nanjing 210016, PR China;2. School of Mechanical & Electrical Engineering, Wuhan Institute of Technology, 693 Xiongchu Avenue, Wuhan 430073, PR China;3. Department of Mechanical Engineering, Southeast University, 2 Si Pai Lou, Nanjing 210096, PR China;4. School of Materials Science and Engineering, University of New South Wales, NSW 2052, Australia;5. School of Mechanical Engineering, University of Adelaide, SA 5005, Australia;1. Key Laboratory of Marine New Materials and Related Technology, Zhejiang Key Laboratory of Marine Materials and Protection Technology, Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, PR China;2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;3. Material Science and Engineering College, Lanzhou University of Technology, Lanzhou 730050, PR China;1. State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, Shanghai 200240, PR China;2. Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong University, Shanghai 200240, PR China;1. Department of Surface Physics and Technology, IK4-TEKNIKER, Iñaki Goenaga 5, 20600 Eibar, Spain;2. SINTEF Materials and Chemistry, 7465 Trondheim, Norway;3. ETSIB University of Basque Country, Department of Material Science, Alameda de Urquijo s/n, 48013 Bilbao, Spain;1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, PR China;2. College of Metallurgy and Materials Engineering, Hunan University of Technology, Zhuzhou, Hunan, 412000, PR China;3. School of Material Science and Engineering, Jiangsu University of Science and Technology, 212003, Jiangsu, PR China |
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| Abstract: | To improve the corrosion resistance and electrical conductivity of Ti-6Al-4V bipolar plates used in polymer electrolyte membrane fuel cells (PEMFCs), a novel electro-conductive Ta2N nanoceramic coating was developed by reactive sputter-deposition using a double cathode glow discharge plasma technique. The microstructure of the coating consisted of fine equiaxed Ta2N grains with an average grain size of ∼13 nm, which exhibited a strong (101) preferred orientation. To explore the influence of both pH values and temperatures on the corrosion resistance of the coating, the electrochemical behaviors and electronic properties of passive films grown on the Ta2N coating were systematically investigated using different electrochemical techniques in simulated PEMFC operating environment. It was shown that either increasing the acidity or the temperatures of the solution, the corrosion potential (Ecorr) decreased and the corrosion current density (icorr) increased. At a given temperature or pH value, the Ta2N coating had a higher Ecorr and lower icorr as compared with uncoated Ti-6Al-4V. The results of EIS measurements showed that with increasing temperature or acidity of the solution, the resistance of the passive film (Rp) formed on the Ta2N coating decreased slightly, being of the order of magnitude of 107 Ω cm2, which was an order of magnitude higher than that of uncoated Ti-6Al-4V. The interfacial contact resistance (ICR) values were found to increase with increasing pH value or decreasing solution temperature, and the ICR values of the Ta2N coating were markedly lower than that of uncoated Ti-6Al-4V, due to the thinner thickness of passive films. Furthermore, the Ta2N-coated Ti-6Al-4V is more hydrophobic than bare Ti-6A1-4V, which was favorable for both the simplification of water management and improving corrosion resistance in PEMFC operating environment. |
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| Keywords: | Polymer electrolyte membrane fuel cell (PEMFC) Bipolar plate Titanium alloy Corrosion resistance Conductivity |
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