(Ce_(20)Nd_(80))_(31)Fe_(bal)B_1M磁体腐蚀产物多样性的研究
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摘要
对双主相粉末烧结工艺制备的(Ce_(20)Nd_(80))_(31)Fe_(bal)B_1M磁体进行高压加速腐蚀实验,观察其腐蚀形貌并进行EDS能谱分析。结果表明:腐蚀24 h后,腐蚀产物呈绒球状和圆球状。绒球状腐蚀产物主要是稀土相氧化物,随着腐蚀时间的增加,绒球状腐蚀产物演变为团絮状;圆球状腐蚀产物主要是铁的氧化物,随着腐蚀时间的延长,圆球状腐蚀产物部分脱落,没有脱落的被腐蚀颗粒缔结到基体上,一定程度上可以阻碍腐蚀的进一步进行。
The (Ce_(20)Nd_(80))_(31)Fe_(bal)B_1M magnets prepared by double main phase powder sintering process were corroded in highly accelerated stress test system. The corrosion morphology was observed and analyzed by EDS energy spectrum. Results show that the corrosion products are bobbles-like and ball-like after corroded for 24 h. The bobbles-like product is mainly rare earth oxide,which evolves into flocculent with the increase of etching time. While the ball-like product is mainly iron oxide,which partially falls off with the increase of etching time,and the remaining corroded particles are concluded on the substrate,preventing further corrosion to some extent.
The (Ce_(20)Nd_(80))_(31)Fe_(bal)B_1M magnets prepared by double main phase powder sintering process were corroded in highly accelerated stress test system. The corrosion morphology was observed and analyzed by EDS energy spectrum. Results show that the corrosion products are bobbles-like and ball-like after corroded for 24 h. The bobbles-like product is mainly rare earth oxide,which evolves into flocculent with the increase of etching time. While the ball-like product is mainly iron oxide,which partially falls off with the increase of etching time,and the remaining corroded particles are concluded on the substrate,preventing further corrosion to some extent.
引文
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[3]王尔德,石刚,郭斌,等.稀土永磁材料研究新进展[J].粉末冶金技术,2005,23(1):55.
[4]王自敏,邓志刚.M型稀土永磁铁氧体的微观结构与磁性研究[J].粉末冶金工业,2016,26(4):45.
[5]李丽娅,易健宏,彭元东,等.纳米晶稀土永磁材料的制备技术研究进展[J].粉末冶金工业,2005,15(5):38.
[6]HUANG Shu-lin,FENG Hai-bo,ZHU Ming-gang,et al.Optimal design of sintered Ce9Nd21FebalB1,magnets with a low-melting-point(Ce,Nd)-rich phase[J].International Journal of Minerals,Metallurgy and Materials,2015,22(4):417.
[7]黄书林.含Ce磁体微结构与磁性能的研究[D].北京:北京科技大学,2015.
[8]朱明刚,方以坤,李卫.高性能Nd-Fe-B复合永磁材料微磁结构与矫顽力机制[J].中国材料进展,2013,32(3):69.
[9]ZHU M,LI W,WANG J,et al.Influence of Ce content on the rectangularity of demagnetization curves and magnetic properties of Re-Fe-B magnets sintered by double main phase alloy method[J].IEEE Transactions on Magnetics,2014,50(1):1.
[10]刘卫强,岳明,张久兴,等.烧结Nd Fe B永磁合金本征腐蚀特性研究进展[J].粉末冶金技术,2006,24(3):195.
[11]YAN G,Mcguiness P J,Farr J P G,et al.Environmental degradation of Nd Fe B magnets[J].Journal of Alloys&Compounds,2009,478(1/2):188.
[12]贺琦军,李卫.钕铁硼永磁材料防腐蚀研究发展[J].金属功能材料,2001,8(5):8.
[13]Chitrada K,Raja K S,Pesic B,et al.Corrosion behavior of surface modified Nd Fe B permanent magnet in dilute chloride environments[J].Electrochimica Acta,2014,123(123):23.
[14]李瑞春,惠英林.钕铁硼烧结磁体失重问题探讨[J].金属功能材料,2011,18(1):52.
[15]孔祥微,刘国征,赵明静,等.烧结Nd Fe B永磁体的腐蚀性研究现状[J].稀土,2013,34(6):69.
[16]吴亚萍,朱明刚,石晓宁,等.(Ce15Nd85)30FebalB1M永磁体湿热条件下的腐蚀性研究[J].中国稀土学报,2016,34(2):173.