Abnormal corrosion behavior of dual-main phase sintered(Ce,Nd)-Fe-B magnets in different sodium solutions

作     者：Xiaoning Shi Minggang Zhu Xiangdong Wang Shaoxiong Zhou Xin Wang Meiling Zhang Wei Li Xiaoning Shi;Minggang Zhu;Xiangdong Wang;Shaoxiong Zhou;Xin Wang;Meiling Zhang;Wei Li

作者机构：Division of Functional MaterialCentral Iron&Steel Research InstituteBeijing 100081China Advanced Technology&Materials Co.Ltd.Beijing 100081China 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2020年第38卷第7期

页      面：735-741,I0002页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0708[理学-地球物理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：Project supported by the National Natural Science Foundation of China(51871063 51571064 51590882)。 

主　　题：Corrosion Dual main phases Sintered(Ce,Nd)-Fe-B Magnetic phase Crack Rare earths 

摘      要：Sintered(Ce,Nd)-Fe-B magnets with high cost performance were prepared by substituting of Ce for Nd with the dual-main phase method.The corrosion behaviors of dual-main phase sintered(CexNd1-x)30Fe69B1(x=0.15 wt%,0.3 wt%) magnets,which were named as Ce15 and Ce30,were studied in 3.5 wt% NaCl,6.6 wt% Na2 SO4 and 3.0 wt% NaOH aqueous solutions,respectively.The galvanic corrosion of Ce30 is stronger than that of Ce15.However,the mass loss value of Ce30 is smaller than Ce15 after free corrosion for 33 d in NaCl solution.In the other two solutions,all the results show that the corrosion resistance of Ce30 is better than that of Ce15.The scanning electron microscope results show that the crack and shedding of the magnetic phase of Ce30 is less than that of Ce15.Combined above,the abnormal corrosion behavior shows that Ce30 magnets perform better corrosion resistance than Ce15,and the degradation degree of magnetic phase mainly affects the corrosion resistance of magnets.