为研究溶解氧量对铂钽复合阳极电化学行为的影响,通过测量阳极的开路电位、动电位极化曲线以及施加电位分别为0.90,1.15,1.35,1.55 V时的电化学阻抗谱,研究了铂钽复合阳极在不同溶解氧量海水中的电化学行为.结果表明,阳极在溶解氧量分别为0,4,8 mg/L时对应的开路电位分别为0.276,0.296,0.372 V,表明阳极的电化学性能有所降低;在施加电位为0.90,1.15 V时,溶解氧在阳极钝化、过钝化过程中对钝化膜的形成以及溶解具有显著的作用,而随着外加电压的增大,在1.35,1.55 V时,阳极二次钝化过程中溶解氧的影响作用减弱.
The influence of concentra-tion of dissolved oxygen in seawater on the electrochemical behav-ior of Pt-Ta composite anode was investigated based on measure-ments of open circuit potential, potential- dynamic polarization curve and electrochemical impedance spectra (EIS) at applied voltage of 0. 90, 1.15, 1.35 V, and 1.55 V. Results show that the open circuit potential at a concentration of dissolved oxygen of 0, 4 mg/L, and 8 mg/L was 0.276, 0.296 V, and 0. 372 V, indicating that the performance of the anode was worsened to some extent in seawater without O2. At an applied potontial of 0. 90 V and 1.15 V, the dissclved oxygen had significant effect on passi-vation and over-passivation of anodes, and on formation and dis-sclution of passivation film as well. At an increased apphed po-tential of 1.35 V and 1.55 V, the effect of the dissolved oxygen during ro-passivation became insignificant.
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