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NdFeB磁体表面致密化Ni镀层制备及其耐腐蚀性能
引用本文:张鹏杰,孙威,李炳山,曹玉杰,唐大为,徐光青,魏汉中,谢光环,王继全,刘辉,王永齐,李亚峰,王倩.NdFeB磁体表面致密化Ni镀层制备及其耐腐蚀性能[J].稀有金属材料与工程,2022,51(8):2863-2869.
作者姓名:张鹏杰  孙威  李炳山  曹玉杰  唐大为  徐光青  魏汉中  谢光环  王继全  刘辉  王永齐  李亚峰  王倩
作者单位:北矿磁材阜阳有限公司;国家磁性材料工程技术研究中心;矿冶科技集团有限公司;合肥工业大学材料科学与工程学院,北矿磁材阜阳有限公司,国家磁性材料工程技术研究中心,北矿磁材阜阳有限公司,北矿磁材阜阳有限公司,合肥工业大学材料科学与工程学院,北矿磁材阜阳有限公司,北矿磁材阜阳有限公司,北矿磁材阜阳有限公司,国家磁性材料工程技术研究中心,国家磁性材料工程技术研究中心,国家磁性材料工程技术研究中心,国家磁性材料工程技术研究中心
基金项目:国家自然科学基金资助(项目号××××)
摘    要:采用高能球磨法实现烧结NdFeB磁体表面Ni镀层的致密化,并对致密化后Ni镀层进行膜/基结合力、维氏硬度测试,通过中性盐雾实验和高温PCT实验研究磁体的耐腐蚀性能,采用静态全浸腐蚀实验进一步分析磁体的腐蚀过程。结果显示,球磨处理工艺可以实现磁体表面Ni镀层的致密化,当转速400 rpm,球磨时间为24 h时,Ni-D24/NdFeB磁体的显微硬度由427.95 HV增加至502.67 HV,结合力由16.30 MPa提升至23.85 MPa,具有更好的耐机械损伤性能。镀层的自腐蚀电流密度较Ni/NdFeB磁体降低了1个数量级,耐中性盐雾时间由312 h提升至480 h,具有更好的耐腐蚀性能。

关 键 词:烧结NdFeB  致密化Ni镀层  维氏硬度  耐腐蚀性能
收稿时间:2021/8/24 0:00:00
修稿时间:2021/10/8 0:00:00

Study on Preparation and Corrosion Behavior of Sintered NdFeB MagnetsCoated with Densed-Ni Coatings
Zhang Pengjie,Sun Wei,Li Bingshan,Cao Yujie,Tang Dawei,Xu Guangqing,Wei Hanzhong,Xie Guanghuan,Wang Jiquan,Liu Hui,Wang Yongqi,Li Yafeng and Wang Qian.Study on Preparation and Corrosion Behavior of Sintered NdFeB MagnetsCoated with Densed-Ni Coatings[J].Rare Metal Materials and Engineering,2022,51(8):2863-2869.
Authors:Zhang Pengjie  Sun Wei  Li Bingshan  Cao Yujie  Tang Dawei  Xu Guangqing  Wei Hanzhong  Xie Guanghuan  Wang Jiquan  Liu Hui  Wang Yongqi  Li Yafeng and Wang Qian
Affiliation:BGRIMM Magnetic Materials and Technology Fuyang Co,Ltd;China;National Engineering Research Center for Magnetic Materials;China;General Research Institute of Mining and Metallurgy;China;School of Materials Science and Engineering,Hefei University of Technology;China,BGRIMM Magnetic Materials and Technology Fuyang Co,Ltd,National Engineering Research Center for Magnetic Materials,BGRIMM Magnetic Materials and Technology Fuyang Co,Ltd,BGRIMM Magnetic Materials and Technology Fuyang Co,Ltd,School of Materials Science and Engineering,Hefei University of Technology,BGRIMM Magnetic Materials and Technology Fuyang Co,Ltd,BGRIMM Magnetic Materials and Technology Fuyang Co,Ltd,BGRIMM Magnetic Materials and Technology Fuyang Co,Ltd,National Engineering Research Center for Magnetic Materials,National Engineering Research Center for Magnetic Materials,National Engineering Research Center for Magnetic Materials,National Engineering Research Center for Magnetic Materials
Abstract:The densed-Ni coatings on sintered NdFeB magnets was prepared by high-energy ball milling method, and the densed-Ni coating was tested by film/substrate bonding force and Vickers hardness. The corrosion resistance of the magnets was studied by neutral salt spray test and high temperature PCT test. The corrosion process of the magnets was further analyzed by static full immersion test. The results showed that the Ni coating on the magnet surface could be densified by ball milling process. The microhardness of Ni-D24/NdFeB magnet increased from 427.95 HV to 502.67 HV and the binding force increased from 16.30 Mpa to 23.85 Mpa at 400 rpm and 24 h ball milling time, which indicated better mechanical damage resistance. The self-corrosion current density of the coating reduced by one order of magnitude compared with that of Ni/NdFeB magnet, and the resistance time to neutral salt spray increased from 312 h to 480 h, showing better corrosion resistance.
Keywords:Sintered NdFeB  Densed-Ni coatings  Vickers hardness  Corrosion behavior
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