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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