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| 纳米CeO2掺杂对烧结钕铁硼磁体表面Zn-Al涂层性能的影响 |
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曹玉杰,刘友好,张鹏杰,徐光青,刘家琴,衣晓飞,吴玉程
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1.合肥工业大学材料科学与工程学院, 合 肥 230009;2.稀土永磁材料国家重点实验室,合肥 231500;3.北矿磁材(阜阳)有限公司,阜阳 236000;4.合肥工业大学材料科学与工程学院，先进功能材料与器件安徽省重点实验室, 合 肥 230009;5.合肥工业大学先进功能材料与器件安徽省重点实验室，工业与装备技术研究院, 合肥 230009
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| 摘要: |
| 采用喷涂工艺在烧结钕铁硼磁体表面制备了不同纳米 CeO2 掺杂量的 CeO2 / Zn-Al 复合涂层。 利用扫描电子显微镜、显微硬度仪、盐雾试验箱和电化学工作站对 CeO2 / Zn-Al 复合涂层的微观结构、力学性能及耐腐蚀性能进行表征分析。 结果表明:CeO2 纳米颗粒较均匀弥散分布于 Zn-Al 涂层中,不仅能够增加 Zn-Al 涂层的硬度,而且可以提高 Zn-Al 涂层的屏蔽性能,CeO2 / Zn-Al 复合涂层耐中性盐雾试验能力高达 720 h。 添加的 CeO2 颗粒能够隔绝 Zn-Al 涂层中的锌铝薄片之间的直接接触,起到绝缘作用,延长了腐蚀介质渗入钕铁硼基体的腐蚀通道。 |
| 关键词: 烧结钕铁硼磁体 纳米 CeO2 颗粒 Zn-Al 涂层 耐腐蚀性能 腐蚀机理 |
| DOI：10.11933/j.issn.1007-9289.20200617001 |
| 分类号:TG174.442 |
| 文章编号:1007-9289(2020)06-0100-08 |
| 文献标识码:A |
| 基金项目:安徽省科技重大专项(18030901098)； 安徽省重点研究和开发计划项目(1804a09020068)； 北京矿冶科技集团有限公司重点基金项目(20190898000002) |
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| Effects of CeO2 Nanoparticles Doping on Properties of Zn-Al Coating on Sintered NdFeB Magnets |
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Cao Yujie1,2, Liu Youhao3, Zhang Pengjie4, Xu Guangqing5, Liu Jiaqin6, Yi Xiaofei3, Wu Yucheng5
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1.School of Materials Science and Engineering Hefei University of Technology, Hefei 230009, China;2.State Key Laboratory of Rare Earth Permanent Magnet Materials, Hefei 231500, China;3.State Key Laboratory of Rare Earth Permanent Magnet Materials, Hefei 231500 , China;4.BGRIMM Magnetic Materials and Technol- ogy (Fuyang) Co Ltd, Fuyang 236000 , China;5.School of Materials Science and Engineering, Key Laboratory of Advanced Functional Materials and Devices of Anhui Province,Hefei University of Technology, Hefei 230009, China;6.Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei 230009, China
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| Abstract: |
| CeO2 / Zn-Al composite coatings with different contents of CeO2 nanoparticles contents were prepared on the surface of sintered NdFeB magnets using spraying technique. The microstructures, mechanical properties, and corrosion resistance of CeO2 / Zn-Al coating layers were analyzed by means of scanning electron microscopy (SEM), microhardness tester, neutral salt spray test chamber, and electrochemical workstation. Results show that the introduction of dispersive CeO2 nanoparticles disperse into Zn-Al layer, not only enhances the hardness of Zn-Al coating layer, but also improves the shielding performance of Zn-Al coating layer, and thus the resistance to neutral salt spray test of the CeO2 / Zn-Al composite coatings can reach up to 720 h. The addition of CeO2 nanoparticles can act as an insulator to avoid the direct contact between Zn-Al flakes in Zn-Al coating, and pro- long the corrosion channel of corrosion medium penetrating into NdFeB substrate. |
| Key words: sintered NdFeB magnets CeO2 nanoparticles Zn-Al coating corrosion resistance corrosion mechanism |