Rare earth passivation was conducted on Zn coated NdFeB magnets by chemical reaction to enhance the corrosion resistance performance. Morphologies, microstructures and compositions of different passivated coatings were studied by X-ray diffraction, field emission scanning electron microscopy, and X-ray photoelectron spectroscopy, respectively. The corrosion behavior was evaluated by electrochemical measurement and neutral salt spray test. The results show that the rare earth passivation can enhance the corrosion resistance of Zn coated NdFeB magnets. When the concentration of cerium nitrate is 5 g/L, the passivated specimens can achieve the longest NSS time of 360 h, which is 144 h longer than that of the pristine Zn/NdFeB magnets. The passivation layer on the Zn coating surface contributes to the enhancement of the magnets’ corrosion resistance.

通过化学反应对Zn涂层NdFeB磁体进行稀土钝化以提高耐腐蚀性能。分别通过X射线衍射、场发射扫描电子显微镜和X射线光电子能谱研究了不同钝化涂层的形貌、微观结构和成分。通过电化学测量和中性盐雾试验评估腐蚀行为。结果表明，稀土钝化可以提高锌包覆钕铁硼磁体的耐腐蚀性能。当硝酸铈浓度为 5 g/L 时，钝化后的试样可以达到 360 h 的最长 NSS 时间，比原始 Zn/NdFeB 磁体的 NSS 时间长 144 h。锌涂层表面的钝化层有助于增强磁体的耐腐蚀性。