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。
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 about27μm,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.
作者
江杰
姜建军
杨丽景
雷步芳
赵宇
林建强
宋振纶
JIANG Jie;JIANG Jianjun;YANG Lijing;LEI Bufang;ZHAO Yu;LIN Jianqiang;SONG Zhenlun(School of Materials Science and Engineering,Taiyuan University of science and Technology,Taiyuan 030024,China;Zhejiang Key Laboratory of Marine Materials and Protective Technologies,Key Laboratory of Marine Materials and Related Technologies,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;Hangzhou Permanent Magnet Group Co.Ltd.,Ningbo 311231,China;Ningbo Zhaobao Magnetic Industry Co.Ltd.,Ningbo 315299,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2023年第1期104-110,共7页
Journal of Chinese Society For Corrosion and Protection
基金
国家重点研发计划(2021YFB3502902)
宁波市重点技术研发项目(2021Z024)。
关键词
无铬Zn-Al涂层
微观形貌
硅烷
耐蚀性
稀土
chromium-free Zn-Al coating
micromorphology
silane
corrosion resistance
rare earth
