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

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.

發文機構：Division of Functional Material Advanced Technology&Materials Co.

關鍵詞：CorrosionDualmainphasesSintered(CeNd)-Fe-BMagneticphaseCrackRareearths

分類號： TM27[一般工業技術—材料科學與工程]