Redox Behavior of Se on Iron-Based Materials in Simulated Geological Disposal Environment of HLW

In this paper, reduction-oxidation between Se and iron-based materials(pure iron and 304L stainless steel) was carried out in glove box under ambient temperature and low-oxygen. Using ion chromatography to analyse the concentration changes of sodium selenate solution and sodium selenite solution in which iron-based materials were immersed. The iron-based material samples before and after the reaction were analysed by scanning electron microscopy(SEM), energy dispersive spectrometer(EDS) and Raman spectrometry. The results show that the oxidation-reduction reaction rate of SeO^2-₄/SeO^2-₃ and pure iron is significantly faster than that of SeO^2-₄/SeO^2-₃ and 304L stainless steel; the reaction rate of ironbased materials and SeO^2-₃ is higher than that of iron-based materials and SeO^2-₄.