V_(3)TiNi_(0.56)Cr_(x)(x=0,0.2,0.4,0.6)/NiMoW钒基复合析氢阴极电催化与耐蚀性能研究

Study on the corrosion resistance of vanadium-based V_(3)TiNi_(0.56)Cr_(x)(x=0,0.2,0.4,0.6)/NiMoW composite cathode for hydrogen evolution

主要研究了金属元素Cr对钒基复合析氢阴极V_(3)TiNi_(0.56)Cr_(x)(x=0,0.2,0.4,0.6)/NiMoW合金物相、形貌、电催化性能与耐腐蚀性能的影响。结果表明:随着合金基体材料中Cr含量增加,基体合金表面形成了钝化膜,能够使基体材料在电化学腐蚀的过程中产生钝化区。钒基复合析氢阴极的电催化能力略有下降,由极化曲线外推法计算得到自腐蚀电流减小3.61 mA/cm、自腐蚀电位正移0.154 V。长时间电解后,钒基复合析氢阴极表面形成的缝隙减少,电流密度变化幅度减小,说明掺杂金属元素Cr后,其耐蚀性能与长效稳定性均有所提高。

This article mainly studied the influence of Cr element on the electrocatalytic performance and corrosion resistance of vanadium-based V_(3)TiNi_(0.56)Cr_(x)(x=0,0.2,0.4,0.6)/NiMoW composite cathode for hydrogen evolution.The phase,morphology,electrocatalytic performance,and corrosion resistance of V_(3)TiNi_(0.56)Cr_(x)(x=0,0.2,0.4,0.6)/NiMoW alloy during the electrocatalytic process is analyzed.A passivation film is formed on the surface of the matrix alloy,which can create a passivation zone in the electrochemical corrosion process of the matrix material.It is considered to contain Ni and Cr interstitial substituents.The electrocatalytic ability of vanadium-based composite cathode for hydrogen evolution slightly decreases.The self-corrosion current decreases by 3.61 mA/cm and the self-corrosion potential shifts forward by 0.154 V,which is calculated by the polarization curve extrapolation method.After long-term electrolysis,the amount of gaps formed on its surface decrease,and only slight changes existed in the amplitude of current density change,indicating that its corrosion resistance and long-term stability have been improved.