Effects of Cr addition on magnetic and corrosion properties of LaFell.5-xCrxSi1.5 （x=0.1, 0.3, 0.4） magnetic refrigerants were investigated. It was found that the addition of Cr slightly decreased the magnetic entro...Effects of Cr addition on magnetic and corrosion properties of LaFell.5-xCrxSi1.5 （x=0.1, 0.3, 0.4） magnetic refrigerants were investigated. It was found that the addition of Cr slightly decreased the magnetic entropy change, but it was effective in increasing corrosion resistance of La-Fe-Si compounds within the composition range examined. Corrosion measurements showed that corrosion current density of these La-Fe-Si compounds in distilled water decreased from 2.6×10^-6 to 8.7×10^-7 A/cm2, with x increasing from 0 to 0.3, while magnetic entropy change in LaFeH.5-xCrxSi1.5 compounds did not change significantly （-△Smax was 18.0, 17.0, 13.6, 11.1 1/（kg·K）） under 2 T for x=0, 0.1, 0.3, 0.4, respectively）. Surface optical microstructures of compounds after corroded showed that cor- rosion took place at grains and grain boundaries simultaneously and surface concentration of corroded points on LaFe11.5- xCrxSi1.5 （x=0.1, 0.3, 0.4） compounds reduced obviously.展开更多
基金Project supported by National Science Foundation of China (50971022)the National High Technology Research (2011AA03A404)
文摘Effects of Cr addition on magnetic and corrosion properties of LaFell.5-xCrxSi1.5 （x=0.1, 0.3, 0.4） magnetic refrigerants were investigated. It was found that the addition of Cr slightly decreased the magnetic entropy change, but it was effective in increasing corrosion resistance of La-Fe-Si compounds within the composition range examined. Corrosion measurements showed that corrosion current density of these La-Fe-Si compounds in distilled water decreased from 2.6×10^-6 to 8.7×10^-7 A/cm2, with x increasing from 0 to 0.3, while magnetic entropy change in LaFeH.5-xCrxSi1.5 compounds did not change significantly （-△Smax was 18.0, 17.0, 13.6, 11.1 1/（kg·K）） under 2 T for x=0, 0.1, 0.3, 0.4, respectively）. Surface optical microstructures of compounds after corroded showed that cor- rosion took place at grains and grain boundaries simultaneously and surface concentration of corroded points on LaFe11.5- xCrxSi1.5 （x=0.1, 0.3, 0.4） compounds reduced obviously.
