作　　者： ; ; ; ;

机构地区： 广东工业大学材料与能源学院

出　　处： 《电镀与涂饰》 2010年第6期51-54,共4页

摘　　要： 研究了稀土盐对水性锌铝合金涂层的组织结构和耐蚀性能的影响。扫描电镜、能谱和X射线衍射分析表明,合金涂层由片层状的锌和铝紧密构成,在片层间存在致密的稀土转化膜;中性盐雾试验、电化学阻抗谱(EIS)和极化曲线测试表明,当Ce(NO_3)_3的含量为5 g/L时,涂层耐盐雾腐蚀时间达到600 h,是没有加入稀土的涂层的2倍。含稀土盐的涂层的高耐蚀性与其中形成的硅烷-稀土协同钝化作用有关。 The influence of rare earth salt on the microstructure and corrosion resistance of water-based Zn-Al alloy coating was studied. Analysis results of scanning electron microscopy, energy-dispersive spectroscopy and X- ray diffraction indicated that the alloy coating is compact and composed of laminar zinc and aluminum. A compact rare earth conversion film exists between flakes. Test results of neutral salt spray test （NSS）, electrochemical impedance spectroscopy （EIS） and polarization curves proved that the salt spray corrosion resistance of the coating prepared with 5 g/L CeCNO3）3 in terms of time is up to 600 h, which is twice that of the coating without rare earth. The coating with rare earth salt has good corrosion resistance because of a synergistic passivation effect of silane and rare earth.

关 键 词： 锌铝合金涂层 水性 硝酸铈 耐蚀性 微观结构 电化学阻抗谱

领　　域： [金属学及工艺] [金属学及工艺]