PEMWE钛双极板表面碳化钛复合涂层制备与性能研究

Preparation and Performance Study of Titanium Carbide Coatings on Titanium Bipolar Plates for PEMWE Applications

质子交换膜电解池中钛双极板起着传导电流、支撑结构以及传输水气的作用,但在酸性富氧高极化环境中,其表面容易氧化和腐蚀,导致电解效率下降。采用氮气雾化喷涂-热处理的方法在TA1钛基体表面制备碳化钛/环氧树脂/聚酰亚胺复合涂层。复合涂层中碳化钛颗粒主要提供高导电性和耐蚀性,而黏结剂主要提高涂层与基体的结合力。当黏结剂中环氧树脂与聚酰亚胺树脂质量比为4∶1时制备的样品表面均匀无裂纹,在140 N/cm^(2)压力下,该样品的接触电阻(1.35 mΩ/cm^(2))比钛基体低了28.95%。在1.8 V(相对于可逆氢电极)恒电位极化过程中,具有碳化钛复合涂层的样品表现出更低的极化电流密度和更高的稳定性。

In proton exchange membrane electrolysis cells,titanium bipolar plates play crucial roles in conducting current,providing structural support,and facilitating water and gas transport.However,in highly acidic and oxygen-rich environments,these plates are prone to oxidation and corrosion,leading to decreased electrolysis efficiency.In this study,a method involving nitrogen atomization spray coating followed by heat treatment is used to prepare a composite coating of titanium carbide/epoxy resin/polyimide on the surface of TA1 titanium substrates.The titanium carbide particles in the composite coating primarily provide high conductivity and corrosion resistance,while the adhesive mainly enhances adhesion between the coating and the substrate.Samples prepared with an epoxy resin to polyimide resin mass ratio of 4:1 exhibit uniform surfaces without cracks.Under a pressure of 140 N/cm^(2),the contact resistance of these samples(1.35 mΩ/cm^(2))is 28.95%lower than that of the titanium substrate.During constant potential polarization at 1.8 V(versus the reversible hydrogen electrode),samples with the titanium carbide composite coating demonstrate lower polarization current density and higher stability.