The influence of Co and Ga additions on the corrosion behavior of nanocrystalline NdFeB magnets
The influence of Co and Ga additions on the corrosion behavior of nanocrystalline NdFeB magnets
复制标题
DOI：
10.1016/s0010-938x(01)00163-9
复制
发表时间：
2002-08-01
影响因子：
8.3
通讯作者：
Schultz, L
中科院分区：
文献类型：
--
作者：
El-Moneim, AA;Gebert, A;Schultz, L
以熔融纺丝材料为原料，经700℃热压和800℃退火0.5 ~ 6 h，制备了60 ~ 600 nm不同晶粒尺寸的纳米晶Nd14Fe80B6和Nd12Dy2Fe73.2Co6.6Ga0.6B5.6磁体，并用XRD对其微观结构进行了表征。扫描电镜。能量色散x射线分析。和克尔显微镜。采用原位电感耦合等离子体溶液分析方法研究了钕铁硼磁体在0.1 M H2SO4中的腐蚀行为。重量和电化学技术。采用热脱附分析和热萃取法研究了腐蚀过程中的吸氢/脱附行为。用Co和Ga部分取代Fe可以提高材料的耐蚀性，降低材料对氢的亲和力和结合能。显微组织的粗化使这些材料具有更好的腐蚀性能。从溶蚀、加氢和机械降解等方面讨论了磁体的腐蚀行为与相组成、相分布和晶粒尺寸的关系。(C) 2002年Elsevier Science Ltd.出版
Isotropic nanocrystalline Nd14Fe80B6 and Nd12Dy2Fe73.2Co6.6Ga0.6B5.6 magnets with different grain sizes in the range of 60-600 nm have been produced from melt-spun materials by hot pressing at 700 degreesC and Subsequent annealing at 800 degreesC for 0.5-6 h. The microstructure has been characterized using XRD. SEM. energy dispersive X-ray analysis. and Kerr microscopy. The corrosion behavior of NdFeB magnets has been examined on 0.1 M H2SO4 by in situ inductively coupled plasma solution analysis. gravimetric and electrochemical techniques. The corrosion hydrogen absorption/desorption behavior has been investigated by thermal desorption analysis and hot extraction methods. Partial substitution of Fe with Co and Ga leads to all improvement in corrosion resistance and reduces the affinity and binding energy for hydrogen in these materials. Coarsening of the microstructure results in a better corrosion performance of these materials. The corrosion behavior of the magnets in relation to phase composition, phase distribution and grain size is discussed in terms of dissolution, hydrogenation and mechanical degradation. (C) 2002 Published by Elsevier Science Ltd.