LaFe_(11.832-x)Ni_(x)Si_(1.4)合金磁热效应、腐蚀行为及防腐蚀研究  

Magnetocaloric effect,corrosion behavior and corrosion prevention of LaFe_(11.832-x)Ni_(x)Si_(1.4) alloy

作　　者：王仁浩 傅斌 韩洁 王佳琪 胡洁 WANG Renhao;FU Bin;HAN Jie;WANG Jiaqi;HU Jie(School of Materials Science and Engineering,Tianjin University of Technology,Tianjin 300384,China;School of Science,Tianjin University of Technology,Tianjin 300384,China;School of Materials Science and Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]天津理工大学材料科学与工程学院,天津300384 [2]天津理工大学理学院,天津300384 [3]石家庄铁道大学材料科学与工程学院,石家庄050043

出　　处：《材料工程》2025年第4期114-124,共11页Journal of Materials Engineering

基　　金：天津市自然科学基金项目(18JCQNJC02500)。

摘　　要：为解决La(Fe,Si)_(13)磁制冷材料在换热介质中的腐蚀问题,尝试用Ni元素部分替代Fe元素,并对替代前后LaFe_(11.832-x)Ni_(x)Si_(1.4)(x=0,0.1,0.2,0.3,质量分数,下同)合金的磁热性能及不同介质中的腐蚀行为进行了系统的研究。结果表明,当Ni含量小于0.2时,LaFe_(11.832-x)Ni_(x)Si_(1.4)可保持良好的磁热性能,其2 T磁场下磁熵变可达15.31 J/(kg·K)(x=0.1),14.00 J/(kg·K)(x=0.2),相对磁制冷能力分别为151.6,156.8 J/kg,且磁滞损耗明显降低。在去离子水中,LaFe_(11.832-x)Ni_(x)Si_(1.4)合金的腐蚀电流Icorr随Ni含量的增加由2.6159μA/cm^(2)降低至2.0863μA/cm^(2)。而复配缓蚀剂4 g/L BTA+1 g/L Na_(2)MoO_(4)·2H_(2)O中LaFe_(11.832-x)Ni_(x)Si_(1.4)合金最大缓蚀效率为77.06%,表现出较好的缓蚀效果。LaFe_(11.832-x)Ni_(x)Si_(1.4)(x≤0.2)合金配合4 g/L BTA+1 g/L Na_(2)MoO_(4)·2H_(2)O复配缓蚀剂可作为实用化的磁制冷机工质与介质的备选组合。To solve the corrosion problem of La(Fe,Si)_(13) magnetic refrigeration material in the heat exchange medium,an attempt is made to partially replace Fe element with Ni element.The magnetocaloric properties of LaFe_(11.832-x)Ni_(x)Si_(1.4)(x=0,0.1,0.2,0.3,mass fraction,the same below)alloys before and after the substitution,as well as the corrosion behavior in different media,are systematically studied.The results show that when the Ni content is less than 0.2,LaFe_(11.832-x)Ni_(x)Si_(1.4)can maintain good magnetocaloric performance.Its magnetic entropy change under a 2 T magnetic field can reach 15.31 J/(kg·K)(x=0.1)and 14.00 J/(kg·K)(x=0.2),and the relative magnetic cooling capacity is 151.6 J/kg and 156.8 J/kg,respectively,with significantly reduced magnetic hysteresis loss.In deionized water,the corrosion current Icorr of LaFe_(11.832-x)Ni_(x)Si_(1.4)alloy decreases from 2.6159μA/cm^(2)to 2.0863μA/cm^(2)with increasing Ni content.The maximum corrosion inhibition efficiency of LaFe_(11.832-x)Ni_(x)Si_(1.4)alloy in combined inhibitor of 4 g/L BTA+1 g/L Na_(2)MoO_(4)·2H_(2)O is 77.06%,showing a good corrosion inhibition effect.The LaFe_(11.832-x)Ni_(x)Si_(1.4)(x≤0.2)alloy with 4 g/L BTA+1 g/L Na_(2)MoO_(4)·2H_(2)O can be used as an alternative combination of working fluid and medium for practical magnetic refrigerators.

关 键 词：La(Fe Si)_(13)合金 磁热效应 腐蚀行为 缓蚀剂 

分 类 号：TG132[一般工业技术—材料科学与工程]