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Effects of Cr addition on magnetic and corrosion properties of LaFe11.5-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 LaFe11.5-xCrxSi1.5 compounds did not change significantly (-ΔSmax was 18.0, 17.0, 13.6, 11.1 J/(kg·K)) under 2 T for x=0, 0.1, 0.3, 0.4, respectively). Surface optical microstructures of compounds after corroded showed that corrosion 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.
Effects of Cr addition on magnetic and corrosion properties of LaFe11.5-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 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 LaFe11.5-xCrxSi1.5 compounds did not change significantly (-ΔSmax was 18.0, 17.0, 13.6, 11.1 J / (kg · K)) under 2 T for Surface optical microstructures of compounds after corroded showed that corrosion 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.