La-Fe-Si系磁制冷材料腐蚀行为研究.doc

La-Fe-Si系磁制冷材料腐蚀行为研究 摘 要 La(Fe,Si)1系列化合物有的磁热效应有NaZn13型结构，磁制冷研究的热点材料La(Fe,Si)13系列化合物。然而在水中，严重腐蚀这些La(Fe,Si)1化合物，制冷机。而，腐蚀的研究。在本论文中，La(Fe,Si)13磁制冷材料的腐蚀，LaFe11Co0.5Si1.5的结构腐蚀，得： LaFe11Co0.5Si1.5化合物是NaZn13型结构有α-Fe相La相。电解质，三相成原电池。了化合物磁热效应的主相，了，LaFe11Co0.5Si1.5化 关键词：磁制冷，，腐蚀 Study on corrosion behavior of La-Fe-Si system magnetic refrigeration materials Abstract La(Fe,Si) 13 this series of compounds have the remarkable magnetocaloric effect, it has NaZn13 type structure, as a hotspot of research on magnetic refrigeration materials, La (Fe, Si) 13 series compounds has become a global focus. In the water, however, the serious corrosion is inevitable in these La (Fe, Si) 13 compounds, which undoubtedly will cause trouble for humans. Thus, the study of the corrosion of refrigerant materials must be critical. Precisely because it is so important in this thesis, set out to La (Fe, Si) 13 why corrosion of magnetic refrigeration materials, including the corrosion process,So: The root cause is that LaFe11Co0.5Si1.5 compounds are composed of three different phases: the main phase NaZn13 structure, and the other two are alpha Fe and La. When the liquid medium as an electrolyte, the three phases make up the original battery. Main contribution to the compound of magnetocaloric effect is the primary phase, main phase as anode corrosion was dissolved, however, that will lead to LaFe11Co0.5Si1.5 and reduce the content of the magnetic entropy change. Key Words：Magnetic ，LaFe11Co0.5Si1.5 compound，Corrosion 目录 第一章 绪论 1 1.1引言 1 1.2磁制冷材料简介 2 1.2.1磁制冷材料腐蚀行为研究进展 1.2.2近室温附近温度区间磁制冷材料 1.3本论文的研究目的和设想 第二章 实验方法 2.1样品制备方法 2.2样品结构分析 2.2.1 X射线衍射分析(XRD) 2.2.2显微组织分析 2.2.3样品磁性能测量 2.3样品腐蚀行为分析 2.3.1腐蚀速率测量 2.3.2腐蚀产物测定 2.3.3电化学分析 第三章 实验结果分析 10 3.1引言 3.2 LaFe11Co0.5Si1.5化合物的结构分析 3.3 LaFe11Co0.5Si1.5化合物的腐蚀行为 3.4结论 参考文献 致谢 第一章 绪论 1.1引言 当今世界，制冷技术已经从人们生活中的衣食住行到与国民经济相关的科学技术的。这两个：冷却效率；氟利昂制冷剂对臭氧层的损害，严重威胁了球的环境。，寻找一种新型效且的制冷方。 1881年，磁热效应Warburg）发现了，由此以，磁制冷技术、强绿色环保海内外。磁制冷技