通过极化曲线法和电化学阻抗谱法测试了稀土盐Nd(NO₃)₃在25 ℃的1.0 mol/L HCl溶液中对1060铝的缓蚀性能。并借助扫描电子显微镜(SEM)和原子力显微镜(AFM)表征了腐蚀前后铝表面的微观结构特征。结果表明: Nd(NO₃)₃能有效抑制铝在HCl溶液中的腐蚀, 缓蚀率随着Nd(NO₃)₃含量的增加而升高, 当Nd(NO₃)₃质量浓度为500 mg/L时用极化曲线法测得的缓蚀率高达96.9%, 用电化学阻抗谱法测得的缓蚀率达88.6%;Nd(NO₃)₃主要抑制了阴极反应, 为阴极抑制型缓蚀剂; 添加500 mg/L Nd(NO₃)₃可使铝表面的腐蚀程度急剧下降, 表现出良好的缓蚀性能。

The corrosion inhibition of rare earth salt of Nd(NO₃)₃ to 1060 aluminum in 1.0 mol/L HCl solution at 25 ℃ was studied by polarization curve method and electrochemical impedance spectroscopy (EIS) method. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to characterize the microstructure of the aluminum surface before and after corrosion. The results show that Nd(NO₃)₃ could efficiently retard the corrosion of aluminum in HCl solution. And the inhibition efficiency increased with the increase of Nd(NO₃)₃ content. The inhibition efficiency could hit 96.9% by polarization curve method and 88.6% by EIS method when the mass concentration of Nd(NO₃)₃ was 500 mg/L. Nd(NO₃)₃ mainly retarded cathodic reaction, so it was a cathodic inhibitor. Adding 500 mg/L Nd(NO₃)₃ could sharply reduce the corrosion degree of aluminum surface, showing good corrosion inhibition performance.