Evaluation of CoBlast Coated Titanium Alloy as Proton Exchange Membrane Fuel Cell Bipolar Plates

A. Oladoye, J. Carton, A. Olabi
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引用次数: 10

Abstract

We investigated the potential of graphite based coatings deposited on titanium V alloy by a low-cost powder based process for bipolar plate application. The coatings which were deposited from a mixture of graphite and alumina powders at ambient temperature, pressure of 90 psi, and speed of 20 mm were characterised and electrochemically polarised in 0.5 M H2SO4 + 2 ppm HF bubbled with air and hydrogen gas to depict the cathode and anode PEM fuel cell environment, respectively. Surface conductivity and water contact angles were also evaluated. Corrosion current in the 1 μA/cm2 range in both cathodic and anodic environment at room temperature and showed negligible influence on the electrochemical behaviour of the bare alloy. Similar performance, which was attributed to the discontinuities in the coatings, was also observed when polarised at 0.6 V and −0.1 V with air and hydrogen bubbling at 70∘C respectively. At 140 N/cm2, the coated alloy exhibited contact resistance of 45.70 mΩ·cm2 which was lower than that of the bare alloy (66.50 mΩ·cm2) but twice that of graphite (21.29 mΩ·cm2). Similarly, the wettability test indicated that the coated layer exhibited higher contact angle of 99.63° than that of the bare alloy (66.32°). Over all, these results indicated need for improvement in the coating process to achieve a continuous layer.
钴包覆钛合金作为质子交换膜燃料电池双极板的性能评价
研究了采用低成本粉末工艺在V钛合金表面沉积石墨基涂层用于双极板的潜力。该涂层由石墨和氧化铝粉末混合物在室温、90 psi压力和20 mm速度下沉积而成,并在0.5 M H2SO4 + 2 ppm HF空气和氢气中进行了电化学极化,分别描绘了阴极和阳极PEM燃料电池环境。表面电导率和水接触角也进行了评估。室温下阴极和阳极腐蚀电流均在1 μA/cm2范围内,对裸合金电化学行为的影响可忽略不计。在0.6 V和- 0.1 V下,空气和氢气在70°C下鼓泡时,也观察到类似的性能,这是由于涂层的不连续性造成的。在140 N/cm2下,涂层合金的接触电阻为45.70 mΩ·cm2,低于裸合金的接触电阻(66.50 mΩ·cm2),是石墨接触电阻(21.29 mΩ·cm2)的两倍。润湿性测试结果表明,涂层的接触角为99.63°,高于裸合金的接触角(66.32°)。总之,这些结果表明需要改进涂层工艺以实现连续层。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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