【摘要】 采用稀土铈盐钝化工艺对镀锌钢板进行了钝化处理。比较了镀锌钢板在0.5mol/L的NaC l溶液中钝化前后的极化曲线、电化学交流阻抗谱。研究了铈盐钝化膜的耐蚀性能,并根据阻抗谱特征建立了腐蚀等效电路。结果表明:经铈盐钝化处理后的镀锌钢板,其腐蚀电流密度下降、极化电阻升高,稀土铈盐钝化膜抑制了镀锌钢板的腐蚀过程,经铈盐钝化处理后,镀锌钢板的耐蚀性能优于空白试样,接近低铬钝化处理样品的耐蚀性。同时,简要分析了稀土铈盐对镀锌钢板的钝化机理。更多还原

【Abstract】 A novel cerium passivating treament process is studied on galvanized steel.The optimum process of cerium passivating film for galvanized steel is adopted.The electrochemical behavior of cerium passivating film on galvanized steel in 0.5mol/L NaCl solution is investigated by polarization curves and AC impendence spectroscopy.The corrosion equivalent circuit has been established according to impedance characteristics.The results show that the corrosion current density decreases and the polarization resistance increases after cerium passivation.Cerium passivating film inhibites the corrosion rate of the galvanized steel.After cerium passivating treatment,the corrosion resistance of the galvanized steel in 0.5mol/L NaCl solution is near to low-chromate passivation treated samples.The mechanisms of cerium passivation on galvanized steel are discussed in detail.更多还原