【摘要】 在烧结钕铁硼永磁试样表面制备了无铬锌铝烧结涂层，并确定了工艺参数。利用扫描电子显微镜(SEM)、能谱仪(EDS)、X射线衍射仪(XRD)、Fourier变换红外光谱(FTIR)、热重分析和差热综合热分析仪(TGDTA)对涂层的形貌、组成和形成机理进行了观察和研究。讨论了涂层耐腐蚀机制及其对磁体磁性能的影响。结果表明：Zn-Al涂层均匀地涂覆于NdFeB磁体表面，涂层厚度约为27μm，耐中性盐雾实验能力高达1000 h以上，对NdFeB基体起到阴极保护作用和物理屏蔽功能。更多还原

【Abstract】 A Cr-free Zn-Al coating was prepared via a two-step process, namely spraying Zn-Al paste and subsequently baking, on the surface of sintered Nd-Fe-B permanent magnet, and which was further examined by means of scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), thermogravimetric analysis, and differential thermal comprehensive thermal analyzer(TG-DTA) in terms of its morphology, composition, and formation mechanism of the coating. The corrosion behavior of the coated Nd-Fe-B magnet was studied via immersion testing in 3.5%NaCl solution, and neutral salt spray testing. The results show that Zn-Al coating is uniformly coated on the surface of the NdFeB magnet, the coating thickness is about27 μm, while, its corrosion resistance to neutral salt spray testing is higher than 1000 h; In other word, the Cr-free Zn-Al coating can provide excellent cathodic protection and physical barrier for NdFeB permanent magnet.更多还原