摘要
通过酸洗、浸泡法和电化学腐蚀测试分析了烧结Nd Fe B永磁体在不同浓度的H2SO4溶液、HCl溶液和HNO3溶液中的腐蚀行为。结果表明,烧结Nd Fe B磁体在HNO3溶液中的腐蚀机制为均匀腐蚀,而在H2SO4溶液和HCl溶液中的腐蚀机制为选择性的晶间腐蚀。烧结Nd Fe B磁体在酸溶液中的腐蚀速率随着酸溶液浓度的增加而增加。在浸泡试验和电化学腐蚀试验中,烧结Nd Fe B磁体在HNO3溶液中的腐蚀速率均最小。因此,HNO3溶液更适合作为烧结Nd Fe B磁体的酸洗液。
Corrosion behaviors of sintered NdFeB magnets in H2SO4 solution, HCI solution and HNO3 solution of different concentrations were investigated by pickling, immersion test and electrochemical test. The results show that the corrosion mechanism of sintered NdFeB magnets in HNO3 solution is uniform corrosion, while the one in H2SO4 solution and HCI solution is selectively intergranular corrosion. The corrosion rate of NdFeB magnets increases with increasing of the concentrations of the three acid solutions, and the corrosion rate of NdFeB magnets in the HNO3 solution is the smallest among the three acid solutions both in immersion test and electrochemical test. Therefore, the HNO3 solution is more suitable to be used as the pickling solution for the surface pretreatment of sintered NdFeB magnets.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2015年第4期786-790,共5页
Rare Metal Materials and Engineering
基金
National Science and Technology Key Support Projects of China(2012BAE02B01)
Major Science and Technology Special Projects of Jiangxi Province(2010AZX00200)
Science and Technology Plan Projects of Jiangxi Province(20121BBE50001)
Science and Technology Plan Projects of Department of Education of Jiangxi Province(KJ201109132281)
关键词
烧结NDFEB永磁体
腐蚀行为
酸洗
酸溶液
电化学测试
sintered NdFeB magnet
corrosion behavior
pickling solution
acidic solution
electrochemical test
作者简介
徐吉林，男，1982年生，博士，南昌航空大学材料科学与工程学院，江西南昌330063，电话：079—86453204，E．mail：jlxu@nchu．edu．cn
Corresponding author： Zhong Zhenchen, Ph.D., Professor, School of Materials Science and Engineering, Nanchang Hangkong University, Nanchang 330063, P. R. China, Tel： 0086-791-86453204, E-mail： zzhong.2006@yahoo.com.cn
