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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. S max (max) of the samples annealed for 3, 12 h, 3 and 7 d decreased about 50%, 41%, 16% and 17%, respectively.