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Kinetics of Glass Corrosion in Acid Solutions

机译:酸性溶液中玻璃腐蚀的动力学

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摘要

The interaction of simulated nuclear waste borosilicate glass with acid solutions (pH = 2, pH = 4) was studied under static conditions (i.e. without refreshment of corroding solution) at 30, 60 and 90℃. Tests with stirred and unstirred solution were compared. The rate of glass dissolution (given by the rate of SiO_2 transfer into the solution) and the rate of glass leaching (represented by the rate of sodium transfer into the solution) were significantly higher at lower pH and in stirred solution. The first phenomenon can be explained by the more extensive opening of glass structure at lower pH. The second phenomenon can be caused by the creation of thin solution layer adjacent to the glass surface in the case of unstirred corroding media. The SiO_2 and sodium concentration in this layer are then higher in comparison to the bulk solution. Due to this fact the driving force of glass matrix dissolution and sodium leaching are lower than in the case of stirred solution. The temperature dependencies of the initial rate of glass matrix dissolution and of the sodium diffusion coefficient can be described using equations of Arrhenius' type.
机译:研究了在30、60和90℃的静态条件下(即不腐蚀溶液的新鲜度)模拟核废硼硅酸盐玻璃与酸溶液(pH = 2,pH = 4)之间的相互作用。比较了搅拌和未搅拌溶液的测试结果。在较低的pH和搅拌的溶液中,玻璃的溶解速率(由SiO_2转移到溶液中的速率决定)和玻璃浸出速率(由钠向溶液中转移的速率代表)明显更高。第一种现象可以通过在较低pH下玻璃结构更广泛的打开来解释。第二种现象可能是由于在未搅拌的腐蚀介质的情况下在玻璃表面附近形成了稀溶液层。与本体溶液相比,该层中的SiO_2和钠浓度更高。由于这个事实,玻璃基质溶解和钠浸出的驱动力低于搅拌溶液的驱动力。玻璃基质溶解初始速率和钠扩散系数的温度依赖性可以使用阿伦尼乌斯(Arrhenius)型方程来描述。

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