Understanding the corrosion of nuclear waste glass is critical to predicting its safe disposal within a geological facility. The corrosion mechanisms and kinetics of the International Simple Glass, a simplified version of high-level nuclear waste glass, was shown to be significantly influenced by a high pH cement solution representative of disposal conditions. We provide the first microscopic characterisation of the porous, Zr-rich aluminoalkali-silica gel corrosion layer that was observed. Ca, Na and K from the cement solution were incorporated into the corrosion layer to charge compensate Si, Al and Zr species; the incorporation of Al was postulated to result in precipitation of an aluminosilicate-rich gel with large voids, facilitating rapid transport of species through the gel layer and significantly enhancing the corrosion rate. Precipitation of Al-containing zeolite and phyllosilicate phases was also observed, indicating that cementitious solutions may promote the detrimental ‘rate resumption’ stage of glass corrosion.

了解核废玻璃的腐蚀对于预测其在地质设施中的安全处置至关重要。国际简易玻璃（一种高级核废玻璃的简化版本）的腐蚀机理和动力学显示，它受到代表处理条件的高pH水泥溶液的显着影响。我们提供了观察到的多孔，富含Zr的铝碱硅凝胶腐蚀层的首次微观表征。将水泥溶液中的Ca，Na和K掺入腐蚀层中，以对Si，Al和Zr物质进行电荷补偿。假定铝的掺入导致具有大空隙的富含铝硅酸盐的凝胶的沉淀，从而促进了物质通过凝胶层的快速运输并显着提高了腐蚀速率。