钕铁硼(NdFeB)在高温、潮湿环境易腐蚀进而导致磁性能下降的问题亟待解决。纳米结构Al膜具有物理性能好、与NdFeB电位差小(0.06V)、表面易形成致密氧化膜等特点，在磁性材料防腐领域具有广阔应用前景。项目拟在咪唑类离子液体中实现NdFeB表面纳米结构Al膜的电沉积；联用电沉积电化学噪声(EEN)、石英晶体微天平等技术，探讨溶液组成、添加剂、电流密度等对Al膜“成核/生长”机制的影响，查明调控Al膜晶粒尺寸的重要参数和关键步骤，建立相关理论模型，阐明NdFeB表面纳米结构Al膜的电沉积机理；在上述研究基础上，采用电化学腐蚀噪声(ECN)、EIS等技术，研究晶粒尺寸变化对纳米结构Al膜在服役环境中腐蚀电化学机制的影响，探讨Al膜“微结构-性能（主要是耐蚀性）”关系，揭示其耐蚀性尺寸效应。本项目的开展可为NdFeB表面纳米结构Al膜的工业开发和应用提供坚实基础，具有重要实际意义和理论价值。

Magnetic material NdFeB is apt to be corroded in hot and humid environment, then the structure and magnetic performance are destroyed. Nowadays, it is an urgent problem to be resolved. Nanocrystalline aluminum(Al) film with the character of good physical properties, similar potential with NdFeB (value difference is 0.06V) and dense oxide film formed on the surface in the natural atmospheric environment, has a broad application prospects in the field of magnet protection. In this project, the crystallization and corrosion mechanism of nanocrystalline Al film electrodeposited in imidazole ionic liquid on NdFeB will be researched. Experimental techniques such as electrodeposition electrochemical noise (EES), quartz crystal microbalance (QCM), etc. are adopted to study the effects of solution composition, additives, current densities, etc. on the “nucleation/growth” mechanism of Al film, as well as, the important parameters and key steps of nanocrystalline size control. Moreover, theoretical model will be set up to clarify the mechanism of nanocrystalline Al film on NdFeB. On the base of the above study, the corrosion mechanism of nanocrystalline Al film in service environments will be researched using electrochemical corrosion noise (ECN) and electrochemical impedance spectroscopy (EIS) techniques. Finally, the relationship between microstructure and performance (corrosion resistance mainly) of nanocrystalline Al film will be discussed to reveal the size effect of its corrosion resistance. The implementation of this project has an important practical significance and theoretical value in the industrial development and application of nanocrystalline Al film electrodeposited on NdFeB.