利用锂化还原技术处理乏燃料时,形成了LiCl-Li2O混合熔盐,这将造成反应容器和传送装置材料的加速腐蚀.为了解此类腐蚀的腐蚀机理,采用浸没法腐蚀实验研究了纯铁在750℃不同含量熔融LiCl-Li2O中的腐蚀行为.腐蚀产物的相结构采用X射线衍射(XRD)分析,用电子探针(EPMA)观察截面形貌和分析腐蚀产物的元素分布.实验结果表明,随着Li2O含量的增加,纯铁在750 ℃熔融LiCl-Li2O中的腐蚀产物发生了由LiFe5O8向LiFeO2的转变,这与热力学计算得到的相稳定图一致,同时腐蚀减重随Li2O含量的升高而增大.Li2O含量是影响纯铁在熔融LiCl-Li2O中腐蚀行为的决定性因素.
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