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所属单位：材料科学与技术学院

发表刊物：RARE METAL MATERIALS AND ENGINEERING

关键字：polymer electrolyte membrane fuel cell (PEMFC) bipolar plates ZrC nanocrystalline coating Ti-6Al-4V alloy corrosion resistance interfacial contact resistance (ICR)

摘要：To improve the corrosion resistance and interfacial contact resistance (ICR) in polymer electrolyte membrane fuel cells (PEMFC) environment, ZrC nanocrystalline coating was fabricated on Ti-6Al-4V substrate by a double cathode glow discharge technique. The microstructure of the as-prepared ZrC coating was characterized by X-ray, diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM). Results show that the microstructure of the ZrC coating is continuous and compact, consisting of deposited layer and diffusion layer. The 10 mu m thick deposited layer is composed of equiaxed grains with an average grain size of similar to 12 nm, whereas the 4 mu m thick diffusion layer with the gradient distribution of alloying elements offers a smooth transition of mechanical properties, which is suitable to improve the adhesion strength of the ZrC coating on the Ti-6Al-4V substrate. The electrochemical behavior of ZrC nanocrystalline coating was evaluated in the simulated PEMFC anodic and cathodic environments. The E-corr of the as-deposited ZrC nanocrystalline coating is obviously higher than that of Ti-6Al-4V alloy in a simulated PEMFC environment. At applied cathode (+0.6 V) potential for PEMFC, ZrC nanocrystalline coating is in passive region, and the passive current density is four orders of magnitude lower than that of Ti-6Al-4V alloy. At applied anode (-0.1 V) potential, ZrC nanocrystalline coating exhibits the characteristic of cathodic protection. The results of EIS show that the values of capacitance semicircle, phase angle maximum as well as the frequency range with the phase angle near 80 are larger than those of Ti-6Al-4V alloy in the simulated PEMFC environment. Moreover, ZrC nanocrystalline coating can effectively improve conductivity and hydrophobic nature of Ti-6Al-4V alloy bipolar plate.

ISSN号：1002-185X

是否译文：否

发表时间：2017-04-01

合写作者：Yang, Qian

通讯作者：徐江