Abstract：Six kinds of CrCxthin films with different components in terms of pure C and Cr as targets were deposited on TC4 (Ti-6A14V) substrates by pulse bias arc ion plating (PBAIP). Contact resistance , corrosion resistance and contact angle of surface modified titanium-based metal bipolar plates were measured by electronic universal testing machine, electrochemical workstation and optical contact angle measuring device. The contact resistance of titanium-based bipolar plates with surface modification was reduced. Under compression force of 0. 6 MPa , the contact resistance of Cro. 21 C079 coating on TC4 substrate was 0.45 mOmega · cm2,which was lower than that of original titanium matrix (197. 62 mOmega · cm2) by three orders of magnitude. Under constant temperature of 80 °C water bath and simulated fuel cell corrosion situations (0.5 moVL H2SO4+ 5 * 106moVL HF) with applied anode potential ( -0. 1 V) , the characteristic of cathodic protection of TC4 coatings was exhibited. While at cathode potential of 0.6 V ,the corrosion density of optimal TC4 coating was 0. 10 muA/cm2,which was two orders of magnitude lower than that of the original substrate. The TC4 metal bipolar plate with Cro 21 CQ 79 coating had the best comprehensive performance in conductivity and corrosion resistance.

DOI：10.19535/j.1001-1579.2019.04.001