The corrosion evolution of steel disposal container largely depends on the evolution of surrounding bentonite environment in the long-term geological disposal of high-level radioactive wastes. This study focused on the influence of the deteriorated bentonite sediments on the corrosion behavior of NiCu low alloy steel in the top supernatant and bottom slurry formed by Gaomiaozi bentonite and 0.05 M NaHCO₃ + 0.1 M NaCl + 0.1 M Na₂SO₄ solution. In the top supernatant, the cathodic process of the steel corrosion was transformed from the reduction in oxygen to the reduction in ferric corrosion products with time as same as that in the blank solution. While in the bottom bentonite slurry, the cathodic process always maintained as the hydrogen evolution reaction due to the coverage of more bentonite sediments. Meanwhile, the corrosion rate of NiCu steel was obviously decreased. In addition, the localized corrosion tendency of the steel could also be reduced by the large amount of deteriorated bentonite sediments.

在高放废物长期地质处置过程中，钢制处置容器的腐蚀演变很大程度上取决于周围膨润土环境的演变。本研究重点研究了劣化的膨润土沉积物对高庙子膨润土与0.05 M NaHCO ₃  + 0.1 M NaCl + 0.1 M Na ₂ SO ₄形成的上清液和下浆液中NiCu低合金钢腐蚀行为的影响解决方案。在上清液中，钢腐蚀的阴极过程从氧的还原转变为铁腐蚀产物的还原，时间与空白溶液相同。而在底部膨润土浆液中，由于更多的膨润土沉积物的覆盖，阴极过程始终保持为析氢反应。同时，NiCu钢的腐蚀速率明显降低。此外，大量劣化的膨润土沉积物也可以降低钢材的局部腐蚀倾向。