论文部分内容阅读
采用双阴极等离子溅射沉积技术,在Ti-6A1-4V合金表面制备了厚度为10μm、平均晶粒尺寸为12 nm的ZrC纳米晶涂层。研究了改性前后钛合金双极板在质子交换膜燃料电池环境中的耐腐蚀性能、导电性能以及憎水性能。结果表明:在模拟PEMFC阴/阳极环境中,纳米晶ZrC涂层的腐蚀电位明显高于Ti-6A1-4V合金,而腐蚀电流密度较Ti-6A1-4V合金降低约4个数量级。在+0.6 V阴极工作电极电位下,纳米晶ZrC涂层具有更快的成膜速率以及更高的钝化膜稳定性;而在–0.1 V阳极工作电极电位下,ZrC纳米晶涂层则呈现出阴极保护特征。
ZrC nanocrystalline coatings with a thickness of 10μm and an average grain size of 12 nm were prepared on the surface of Ti-6Al-4V alloy by double-cathode plasma sputter deposition. The corrosion resistance, electrical conductivity and hydrophobic property of the titanium alloy bipolar plate before and after the modification in the proton exchange membrane fuel cell environment were studied. The results show that the corrosion potential of nanocrystalline ZrC coating is obviously higher than that of Ti-6Al-4V alloy in simulated anodic / cathodic PEMFC environment, while the corrosion current density is about 4 orders of magnitude lower than that of Ti-6Al-4V alloy. At +0.6 V cathodic working electrode potential, the nanocrystalline ZrC coating has faster film formation rate and higher passivation film stability; whereas at -0.1 V anode working electrode potential, the ZrC nanocrystalline coating appears Out of cathodic protection features.