硅烷化处理对烧结钕铁硼永磁材料耐腐蚀性能的影响

发布时间：2018-04-16 19:26

  本文选题：烧结钕铁硼 + 永磁材料　； 参考：《材料热处理学报》2017年12期

【摘要】：采用环境友好的硅烷化处理技术在烧结钕铁硼磁体表面制备一层硅烷转化膜,对烧结钕铁硼磁体进行暂时性防护。采用正交试验对过程中的工艺参数进行优化。采用冷场发射扫描电子显微镜(SEM)、拉力试验机、动电位极化曲线及中性盐雾试验(NSS)对所制备的硅烷转化膜的形貌、膜/基体之间结合力以及耐腐蚀性能进行研究。结果表明:硅烷转化膜均匀的涂覆在烧结Nd Fe B磁体表面,涂层致密性高、无孔隙、裂纹等缺陷。硅烷转化膜与基体之间的膜/基结合力强度可达14.14 MPa。薄膜耐中性盐雾试验可达12 h,硅烷转化膜在固化过程中醇基之间脱水缩合反应使硅烷转化膜表面形成具有不同交联密度的区域,在Na Cl溶液中交联密度低的区域首先水解溶解是造成磁体表面硅烷转化膜腐蚀失效的主要原因。
[Abstract]:A layer of silane conversion film was prepared on the surface of sintered NdFeB magnets by using environmentally friendly silane treatment technology to protect the sintered NdFeB magnets temporarily.The process parameters were optimized by orthogonal test.The morphology, adhesion and corrosion resistance of silane conversion films were studied by means of cold field emission scanning electron microscope (SEM), tensile force tester, potentiodynamic polarization curve and neutral salt spray test (NSS).The results show that the silane conversion film is uniformly coated on the surface of sintered ND Fe B magnets, and the coating has high compactness, no porosity, crack and other defects.The binding strength of the film / base between the silane conversion film and the substrate is 14.14 MPA.The neutral salt spray resistance of the film can be up to 12 h. During the curing process of the silane conversion film, the dehydration and condensation reaction between the alcohols resulted in the formation of different cross-linking densities on the surface of the silane conversion film.The main reason for the corrosion failure of silane conversion film on magnetic surface is the hydrolysis and dissolution in the region with low crosslinking density in NaCl solution.
【作者单位】： 合肥工业大学工业与装备技术研究院;稀土永磁材料国家重点实验室(安徽大地熊新材料股份有限公司);合肥工业大学材料科学与工程学院;
【基金】：中国博士后科学基金(2017M612065) 安徽省重点研究与发展计划项目(1704a0902020)
【分类号】：TB304
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本文编号：1760266