关键词: 不锈钢基, 改性电极, 电化学性能, 二氧化铅-碳化钨复合镀层

Abstract: The lead dioxide-tungsten carbide(PbO2-WC) electrodes were prepared on stainless steel substrate by composite electrodeposition. The influences of temperature, current density and WC granule concentration on electrode performance were studied. Analyses of oxygen evolution curves, Tafel curves, scanning electron microscope, X-ray diffraction were used to investigate the performance changes after modified by WC granule. The optimal conditions were obtained as follows, temperature:70 ℃, current density:0015～0.025 A/cm2, WC granule concentration in plating solution:40 g/L. In the process of codeposition, the results showed that the growth of PbO2 is preferred, with the PbO2 grain refined by WC granule, and the coating became denser. In comparison to the PbO2 electrode, the PbO2-WC composite electrode exhibits a stronger corrosion resistance and a lower oxygen evolution potential.

Key words: stainless steel substrate, modified electrode, electrochemical performances, lead dioxide-tungsten carbide composite coating