(华南理工大学 材料科学与工程学院，广州 510640)
摘 要: 采用扫描电镜(SEM)、能谱(EDS)和X射线衍射(XRD)研究Nd对Zn-5%Al合金显微组织的影响，采用电化学极化曲线和中性盐雾试验(NSS)研究不同Nd含量对Zn-5%Al合金耐蚀性的影响。结果表明：添加稀土Nd有效抑制初生η-Zn相的生长，显著增加共晶组织比例且组织致密；适量添加稀土Nd，有助于减小共晶组织层片间距。Nd易与Zn形成Nd2Zn17化合物富集在合金底表面，降低Nd的有效含量，减弱Nd的作用。Zn-5%Al合金耐蚀性随着Nd含量变化而变化，当Nd含量为0.06%时，合金的耐蚀性最好。
关键字: Zn-5%Al合金；Nd；显微组织；耐蚀性
（School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China）
Abstract:The effect of Nd addition on the microstructure of Zn-5%Al alloy was investigated by SEM, EDS, XRD, and the corrosion resistance of the alloy was studied by the polarization curves tests and NSS tests. The results show that the growth of the primary η-Zn phase can be effectively inhibited, and the compact eutectic structure of the alloy can be obtained due to the addition of Nd. The lamellar spacing of eutectic structure of the alloy with the optimal concentration of Nd can be decreased. Nd can be easy to react with Zn and form the intermetallic phase Nd2Zn17 particles in the alloy bath, which will reduce the effective content of element Nd in the alloy bath. The corrosion resistance of the Zn-5%Al alloy will be changed with Nd addition, and the best corrosion resistance of the alloy will be attained when Nd addition is 0.06%.
Key words: Zn-5%Al alloy; Nd; microstructure; corrosion resistance
