This paper is aimed to study the corrosion behavior of composite inert anode material of β-PbO2-WC coated on Ti in elec-trolytic zinc liquid by using electrochemical impedance spectroscopy(EIS)measurement technology and Tafel curves analysis tech-nology,and analysize the surface morphology with scanning electron microscopy(SEM).Three methods were used to investigate the effect of different preparation current density on corrosion resistance of Ti/β-PbO2-WC composite electrode materials in the electro-lytic zinc liquid.The results show that at low current density,the rate of PbO2deposition is slow and the WC particles cannot be completely coated,the coating is too thin and its corrosion resistance is bad.However,at high current density,the coating is being thicker but the coating quality is influenced by the intensified oxygen evolution reaction which leads to bad corrosion resistance;at the 25 mA·cm-2current density,the composite electrode has smaller corrosion current density icorrand larger polarization resistance Rp,greater corrosion reaction activation energy Ea,bigger charge transfer resistance Rt,and larger coating resistance Rd,which cor-responds to that the electrode has the best corrosion resistance prepared at the current density.%本论文为了研究钛基β-PbO2-WC复合惰性阳极材料在电解锌液中的腐蚀行为,采用了电化学交流阻抗谱(EIS)测量技术和Tafel曲线分析技术,并结合电极的表面形貌分析,考察了不同电沉积电流密度对所制备复合电极在电解锌液中的耐蚀性的影响.结果表明:低电流密度时,PbO2的沉积速度慢,不能完全包覆WC微粒并共沉积,镀层太薄耐腐蚀性能低;高电流密度时,镀层较厚但析氧副反应加剧影响镀层质量导致其耐蚀性受影响;电流密度为25mA·cm-2时,复合电极具有较小的自腐蚀电流密度icorr和较大的极化电阻Rp、较大的腐蚀反应活化能Ea、较大的电荷转移电阻Rt以及较大的镀层电阻Rd,对应于该条件制得的电极有最好的耐蚀性能.
展开▼
