Zr-4合金a-Zr固溶体中的Fe、Cr含量分析

Investigation of Fe and Cr Content in a-Zr Solid Solution of Zircaloy-4

将电化学分离Zr-4合金中Zr(Fe,Cr)2第二相粒子的技术和原子吸收光谱分析技术相结合,建立了一种分析Zr-4合金a-Zr固溶体中Fe、Cr含量的新方法,并用这种新方法分析了不同热处理状态下Zr-4合金a-Zr固溶体中的Fe、Cr含量。分析结果表明,随着淬火温度的增加,a-Zr固溶体中的Fe、Cr含量和Fe/Cr比值均增加,而Zr(Fe,Cr)2第二相粒子中的Fe/Cr比值则相应降低。结合以前的工作,可得结论:过饱和固溶在a-Zr固溶体中的Fe、Cr含量对Zr-4合金的耐水侧腐蚀性能有重要影响。

Based on extracting electrochemically the second phase particles Zr(Fe,Cr)2 from Zircaloy-4 and analyzing the mass concentration in the electrolyte by means of Flame Atomic Absorption Spectrometry (FAAS), a new method has been successfully established to detect the Fe and Cr content in α-Zr solid solution of Zircaloy-4. The results show that the Fe and Cr content as well as ratio of Fe/Cr in α-Zr solid solution of Zircaloy-4 will vary with fabrication schedules. Finally, in conjunction with the previous reported corrosion test in superheated water and steam, a conclusion has been drawn that more Fe and Cr supersaturated in α-Zr solid solution plays an important role in corrosion resistance of Zircaloy-4.