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Effect of impurity phase on corrosion resistance and magnetic entropy change for LaFe11.3Co0.4Si1.3C0.15 magnetocaloric compound

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【作者】 胡洁； 付松； 霍岩； 龙毅； 薛佳宁；

【Author】 HU Jie;FU Song;HUO Yan;LONG Yi;XUE Jianing;College of Continuing Education, Shijiazhuang Tiedao University;School of Materials Science and Engineering, University of Science and Technology Beijing;Technique R&D Center, Haier Group;Tianjin Long March Launch Vehicle Manufacturing Co., Ltd.;

【机构】 College of Continuing Education, Shijiazhuang Tiedao University； School of Materials Science and Engineering, University of Science and Technology Beijing； Technique R&D Center, Haier Group； Tianjin Long March Launch Vehicle Manufacturing Co., Ltd.；

【摘要】 Effect of impurity phase（α-Fe phase and La-rich phase） on corrosion resistance and magnetic entropy change of LaFe11.3Co0.4Si1.3C0.15 compound was studied using scanning electron microscopy, potentiodynamic polarization, electrochemical impedance spectroscopy techniques and magnetism testing. With the decrease of impurity phase, the corrosion resistance of LaFe11.3Co0.4Si1.3C0.15 compound was first enhanced and then slightly impaired. Corrosion resistance could be significantly improved by the decrease of α-Fe phase. However, the matrix phase was corroded if the La-rich phase as anode was too few. This caused the corrosion resistance to decrease slightly. After immersing the sample in distilled water for 15 d, –?Smax of the samples annealed for 3, 12 h, 3 and 7 d decreased about 50%, 41%, 16% and 17%, respectively.

【Abstract】 Effect of impurity phase（α-Fe phase and La-rich phase） on corrosion resistance and magnetic entropy change of LaFe11.3Co0.4Si1.3C0.15 compound was studied using scanning electron microscopy, potentiodynamic polarization, electrochemical impedance spectroscopy techniques and magnetism testing. With the decrease of impurity phase, the corrosion resistance of LaFe11.3Co0.4Si1.3C0.15 compound was first enhanced and then slightly impaired. Corrosion resistance could be significantly improved by the decrease of α-Fe phase. However, the matrix phase was corroded if the La-rich phase as anode was too few. This caused the corrosion resistance to decrease slightly. After immersing the sample in distilled water for 15 d, –?Smax of the samples annealed for 3, 12 h, 3 and 7 d decreased about 50%, 41%, 16% and 17%, respectively.

【关键词】 magnetic materials； corrosion behavior； magnetic entropy change； rare earths；
【Key words】 magnetic materials； corrosion behavior； magnetic entropy change； rare earths；
【基金】 supported by the National Natural Science Foundation of China(51571018,51371026);the National High Technology Research and Development Program of China(2011AA03A404)
  • 【文献出处】 Journal of Rare Earths ,稀土学报(英文版) , 编辑部邮箱 ,2016年03期
  • 【分类号】O611.3;TM271
  • 【被引频次】9
  • 【下载频次】49
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