质子交换膜燃料电池服役环境对TA1腐蚀行为的影响

Effect of Service Environment of Proton Exchange Membrane Fuel Cell on the Corrosion Behaviors of TA1

选用纯钛(钛金属牌号TA1)为实验基材,通过动电位、恒电位、电化学阻抗谱(EIS)和模拟工况测试等方法研究了运行环境(温度、pH值、气体氛围)和运行工况(电位和模拟工况时长)对其腐蚀行为的影响,并利用光学显微镜(OM)、能量色散X射线能谱(EDX)、X射线光电子能谱(XPS)、界面接触电阻(ICR)、接触角和表面粗糙度等测试方法,对不同时长模拟工况测试后TA1基材的表面形貌和性能进行了分析.结果表明,运行环境和运行工况对TA1耐蚀性均有影响,在10 h模拟工况测试后,TA1基材表面氧化层的堆积提高了其耐蚀性,腐蚀电流密度从2.62μA/cm^(2)降至0.94μA/cm^(2);其导电性和疏水性显著降低,与商用碳纸之间的ICR值从31.75 mΩ·cm^(2)增加至333.17 mΩ·cm^(2),接触角从86.28°减小至68.04°.

In this study,TA1 was selected as the experimental material to investigate the impacts of operating environment(temperatures,pH,gas atmospheres)and operating conditions(potentials and test duration)on its corrosion behavior using the techniques such as potentiodynamic,potentiostatic,electrochemical impedance spectroscopy(EIS),and working conditions tests.The surface morphology and properties of the TA1 under different durations of working condition test were analyzed by optical microscopy(OM),energy dispersive X-ray spectroscopy(EDX),X-ray photoelectron spectroscopy(XPS),interfacial contact resistance(ICR),contact angle,and surface roughness measurement techniques.The results show that the operating environment and operating conditions all impact the corrosion resistance of TA1.After working conditions tests of 10 h,the accumulated oxide layer on the surface of TA1 improves its corrosion resistance,decreasing corrosion current density from 2.62μA/cm^(2) to 0.94μA/cm^(2).Whereas the conductivity and hydrophobicity of TA1 are significantly reduced,as evidenced by the increase in interfacial contact resistance(ICR)value from 31.75 mΩ·cm^(2) to 333.17 mΩ·cm^(2) compared to commercially available carbon paper and the decrease in contact angle from 86.28°to 68.04°.