电流密度对Ti/β-PbO_(2)-WC复合电极材料在电解锌液中耐蚀性影响研究  

Effect of preparation current density on corrosion resistance of Ti/β-PbO_2-WC composite electrode materials in the electrolytic zinc liquid

作　　者：李会喜 崔文蓉 朱薇[1] 陈阵[1] 余强[1] LI Huixi;CUI Wenrong;ZHU Wei;ZHU Wei;YU Qiang(Faculty of Science,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学理学院,云南昆明650500

出　　处：《化学研究与应用》2018年第2期226-230,共5页Chemical Research and Application

基　　金：国家自然科学基金项目(51464021)资助

摘　　要：本论文为了研究钛基β-Pb O_(2)-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,Pb O_(2)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25m A·cm^(-2)时,复合电极具有较小的自腐蚀电流密度i_(corr)和较大的极化电阻R_p、较大的腐蚀反应活化能E_a、较大的电荷转移电阻R_t以及较大的镀层电阻R_d,对应于该条件制得的电极有最好的耐蚀性能。This paper is aimed to study the corrosion behavior of composite inert anode material of p-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/p-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 the25mA?cm2current density,the composite electrode has smaller corrosion current density icorr and 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.

关 键 词：钛基p-Pb〇2-WC复合电极 电流密度 Tafel 交流阻抗 耐蚀性 

分 类 号：TB333[一般工业技术—材料科学与工程]