| 胡娜,谢发勤,吴向清,李淑良,黄科超,贺栋栋,鲁闯.NdFeB磁体表面环保型Zn-Al涂层的盐雾腐蚀行为[J].装备环境工程,2023,20(4):86-95. HU Na,XIE Fa-qin,WU Xiang-qing,LI Shu-liang,HUANG Ke-chao,HE Dong-dong,LU Chuang.Salt Spray Corrosion Behavior of Environmentally Friendly Zn-Al Coatings on NdFeB Magnets[J].Equipment Environmental Engineering,2023,20(4):86-95. |
| NdFeB磁体表面环保型Zn-Al涂层的盐雾腐蚀行为 |
| Salt Spray Corrosion Behavior of Environmentally Friendly Zn-Al Coatings on NdFeB Magnets |
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| DOI：10.7643/issn.1672-9242.2023.04.012 |
| 中文关键词: Zn-Al涂层 NdFeB磁体 盐雾腐蚀 腐蚀机理 自腐蚀电位 电化学 物理屏蔽作用中图分类号:TG174.4 文献标识码:A 文章编号:1672-9242(2023)04-0086-10 |
| 英文关键词:Zn-Al coating NdFeB magnet salt spray corrosion corrosion mechanism self-corrosion potential electrochemical physical shielding |
| 基金项目:宁波市“科技创新2025”重大专项(2019B10095) |
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| Author | Institution |
| HU Na | School of Civil Aviation, Northwestern Polytechnical University, Xi¢an 710072, China |
| XIE Fa-qin | School of Civil Aviation, Northwestern Polytechnical University, Xi¢an 710072, China |
| WU Xiang-qing | School of Civil Aviation, Northwestern Polytechnical University, Xi¢an 710072, China |
| LI Shu-liang | School of Civil Aviation, Northwestern Polytechnical University, Xi¢an 710072, China |
| HUANG Ke-chao | School of Civil Aviation, Northwestern Polytechnical University, Xi¢an 710072, China |
| HE Dong-dong | School of Civil Aviation, Northwestern Polytechnical University, Xi¢an 710072, China |
| LU Chuang | Ningbo Polytechnic, Ningbo 315800, China |
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| 中文摘要: |
| 目的 研究NdFeB磁体表面环保型Zn-Al涂层在盐雾环境中的腐蚀行为。方法 采用SEM、XRD、EDS、拉曼光谱、傅里叶变换红外光谱等对Zn-Al涂层的形貌、物相、成分结构进行分析。通过电化学曲线探究Zn-Al涂层在盐雾环境中的腐蚀机理。结果 在NdFeB磁体表面制备的环保型Zn-Al涂层的耐盐雾腐蚀时间不少于1 000 h。在盐雾腐蚀环境中，Zn-Al涂层表面逐渐被白锈覆盖，失去金属光泽，腐蚀至1 126 h时，Zn-Al涂层表面出现红色锈点，涂层微观组织呈蜂窝状结构，并出现微裂纹。腐蚀产物由Zn5(OH)8Cl2∙H2O、Al9SiAl12(OH)18(AlO4)(Si5O16)Cl、Fe2O3和极少量的Zn、Al组成。腐蚀前期，Zn-Al涂层表面的钝化膜、硅烷膜起保护作用；随腐蚀进行，膜层破坏暴露出片状金属粉，金属粉活化，涂层发挥牺牲阳极保护作用；腐蚀后期，腐蚀介质通过涂层微裂纹穿透涂层至磁体，涂层牺牲阳极的保护作用和物理屏蔽保护作用显著减弱，直至失效。结论 环保型Zn-Al涂层可显著提高NdFeB磁体的耐中性盐雾腐蚀性能。 |
| 英文摘要: |
| The work aims to study the corrosion behavior of environmentally friendly Zn-Al coatings on NdFeB magnets in the salt spray environment. The morphology, phase and composition of Zn-Al coatings were analyzed by SEM, XRD, EDS, Raman spectroscopy, Fourier transform infrared spectroscopy and other methods. The corrosion behavior of Zn-Al coatings in the salt spray environment was studied with electrochemical curves. The corrosion time of the environmentally friendly Zn-Al coating prepared on the NdFeB magnet was not less than 1 000 hours. In the salt spray corrosion environment, the Zn-Al coating was gradually covered with white rust and lost its metallic luster; 1 126 hours later, there were red rust spots on the Zn-Al coating which showed honeycomb microstructure and microcracks. The corrosion products consisted of Zn5(OH)8Cl2∙H2O, Al9SiAl12(OH)18(AlO4)(Si5O16)Cl, Fe2O3 and a small amount of Zn and Al. In early corrosion, the passivation film and silane film on the Zn-Al coating played a protective role; as the corrosion developed, the film was destroyed, the flake metal powder was exposed and activated, and the coating acted as a sacrificial anode protective effect; In later corrosion, the corrosive medium penetrated the coating into the substrate through the micro-cracks. The protection and physical shielding of the coating¢s sacrificial anode were significantly weakened until failure. Environmentally friendly Zn-Al coatings can significantly improve the NSS corrosion resistance of NdFeb magnets. |
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