Preparation and Performance Study of Titanium Carbide Coatings on Titanium Bipolar Plates for PEMWE Applications
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 oxy-gen-rich environments,these plates are prone to oxidation and corrosion,leading to decreased electrolysis effi-ciency.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 resist-ance,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/cm2,the contact resistance of these samples(1.35 mΩ/cm2)is 28.95%lower than that of the titanium sub-strate.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.
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