sintered NdFeB permanent magnet

作者:于升学;陈玲;
关键词:sintered NdFeB permanent magnet; Zn-Cr coating; magnet property; anticorrosion property; rare earths
单位:Department of Applied Chemistry  Yanshan University Qinhuangdao 066004 China,Department of Applied Chemistry Yanshan University Qinhuangdao 066004 China,
摘要:Zn-Cr coating was prepared Neodymium Magnets
http://www.999magnet.com/products/110-sintered-neodymium-magnets on the surface of sintered NdFeB permanent magnet samples and preparation parameters were established. The anticorrosive property of Zn-Cr coating on NdFeB was studied by whole-immersion test in NaCl solution and compared with that of zinc plating and nickel plating on NdFeB. Open-circuit potential and self-corrosion current of NdFeB samples with and without Zn-Cr coating were measured. The micro-morphology and composition of Zn-Cr coating were analyzed through SEM, XPS, EDS and XRD. The effect of Zn-Cr coating on magnetic property of NdFeB magnet was also investigated. It is exposed that Zn-Cr coating is anodic type coating for NdFeB magnet, and provided substrate electrochemical protection, barrier protection and passivation protection. The anticorrosion property of NdFeB magnet is obviously enhanced by Zn-Cr coating while the magnet property of NdFeB magnet changed little.