粘结NdFeB高耐蚀ZnAl-EP涂层制备及性能研究  

Preparation and Properties of ZnAl-EP Coating for Bonded NdFeB with High Corrosion Resistance

作　　者：杨友文[1] 陈宇凡 蒋楠 王永乐 杨雷 方晓刚 刘继广[1] Yang Youwen;Chen Yufan;Jiang Nan;Wang Yongle;Yang Lei;Fang Xiaogang;Liu Jiguang(School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009

出　　处：《中国稀土学报》2023年第4期748-756,I0003,共10页Journal of the Chinese Society of Rare Earths

基　　金：安徽省重点研究与开发计划项目(202104a05020001);安徽省高校2020年质量工程项目(2020jyxm1514);合肥市重大关键技术研发项目(J2020G20)资助。

摘　　要：采用雾化喷涂工艺在粘结NdFeB磁环(RSM)表面制备得到锌铝/环氧树脂(ZnAl-EP)复合涂层。采用扫描电子显微镜(SEM)、能谱仪(EDS)和3D激光共聚焦扫描显微镜对涂层的表面形貌、化学成分进行了表征。采用极化曲线和中性盐雾试验研究了ZnAl-EP复合涂层的耐蚀性,并探讨了其腐蚀机制。结果表明:ZnAl-EP复合涂层中环氧树脂渗透到ZnAl涂层孔隙中,起到了良好的密封作用。与ZnAl/RSM和EP/RSM相比,ZnAl-EP/RSM在3.5%(质量分数)NaCl溶液中的自腐蚀电流密度降低了2~3个数量级。ZnAl-EP/RSM的耐中性盐雾试验时间达到了1800 h,比单一的ZnAl涂层提高了6~7倍,比单一的环氧树脂涂层提高了4倍,体现了ZnAl-EP复合涂层优越的耐蚀性能。ZnAl/epoxy resin(ZnAl-EP)composite coating was prepared on the surface of the ring-shaped bonded NdFeB magnets(RSM)for the first time by atomization spraying.The surface morphology and chemical composition of the composite coating were characterized by a scanning electron microscope(SEM)with energy dispersive spectroscopy(EDS)and a 3D laser confocal scanning microscope.The corrosion resistance of ZnAl-EP composite coating was analyzed by means of polarization curve and neutral salt spray test,and the corrosion mechanism was studied.It is found out that the epoxy resin in ZnAl-EP composite coating penetrates into the pores of ZnAl coating and plays a good sealing role.Compared with ZnAl/RSM and EP/RSM,the self-corrosion current density of ZnAl-EP/RSM in 3.5%NaCl solution is reduced by 2-3 orders of magnitude.And the neutral salt spray resistance test time of ZnAl-EP/RSM reaches 1800 h,which is 6~7 times higher than that of single ZnAl coating and 4 times higher than that of single epoxy resin coating,reflecting the superior anti-corrosion performance of ZnAl-EP composite coating.

关 键 词：粘结NDFEB ZnAl-EP复合涂层 耐腐蚀性能 腐蚀机制 

分 类 号：TG174.442[金属学及工艺—金属表面处理]