Effect of impurity phase on corrosion resistance and magnetic entropy change for LaFe_(11.3)Co_(0.4)Si_(1.3)C_(0.15) magnetocaloric compound  

作　　者：胡洁 付松 霍岩 龙毅 薛佳宁 

机构地区：[1]College of Continuing Education, Shijiazhuang Tiedao University [2]School of Materials Science and Engineering, University of Science and Technology Beijing [3]Technique R&D Center, Haier Group [4]Tianjin Long March Launch Vehicle Manufacturing Co., Ltd.

出　　处：《Journal of Rare Earths》2016年第3期283-287,共5页稀土学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(51571018,51371026);the National High Technology Research and Development Program of China(2011AA03A404)

摘　　要：Effect of impurity phase（α-Fe phase and La-rich phase） on corrosion resistance and magnetic entropy change of LaFe_（11.3）Co_（0.4）Si_（1.3）C_（0.15） 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 LaFe_（11.3）Co_（0.4）Si_（1.3）C_（0.15） 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, -？S_（max） of the samples annealed for 3, 12 h, 3 and 7 d decreased about 50%, 41%, 16% and 17%, respectively.Effect of impurity phase（α-Fe phase and La-rich phase） on corrosion resistance and magnetic entropy change of LaFe_（11.3）Co_（0.4）Si_（1.3）C_（0.15） 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 LaFe_（11.3）Co_（0.4）Si_（1.3）C_（0.15） 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, -？S_（max） 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 

分 类 号：O611.3[理学—无机化学] TM271[理学—化学]