摘要
采用等离子体磁控溅射的方法在304不锈钢双极板表面沉积出致密均匀的Cr层和Cr2N层。运用X射线衍射、俄歇电子能谱、扫描电镜、界面接触电阻测试和动电位极化等方法,研究了表面镀层对不锈钢双极板导电和耐腐蚀性能的影响。结果表明,经过镀氮化铬层后的双极板界面导电性能良好,在质子交换膜燃料电池(PEMFC)电堆装载压力下,界面接触电阻为20mΩ.cm2,与未镀层相比降低了约70%。双极板的耐腐蚀性能也有显著的增强:在模拟PEMFC环境中,腐蚀电位提高了约300mV,腐蚀电流降低了约1个数量级。
The 304 stainless steel bipolar plates,an important material for the proton exchange membrane fuel cell（PEMFC）,were surface modified with the magnetron sputtered Cr and Cr2N coatings.The microstructures and properties of the Cr and Cr2N coatings were characterized with X-ray diffraction,Auger electron spectroscopy,scanning electron microscopy,and potentiodynamic polarization.The results show that the Cr2N coatings significantly improved the electric conductivity and corrosion resistance of the substrates.For instance,at a stack compacting pressure of the PEMFC,the contact resistance was found to be 20 mΩ·cm2,70% lower than that of the substrate.In the simulated PEMFC environment,the corrosion potential increased by 300 mV,and the corrosion current density decreased by one order of magnitude,indicating a considerable enhancement of corrosion resistance.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2013年第3期240-244,共5页
Chinese Journal of Vacuum Science and Technology
