Crystal glass alteration in an aqueous medium has been extensively studied following the implementation of strict regulations regarding lead leaching. However, despite the widespread use of lead glasses and crystal glass by artists and artisans ever since antiquity, few works focus on crystal glass corrosion in atmospheric conditions. In this preliminary study, the altered layers formed on crystal glass in aqueous and atmospheric conditions at 90°C are compared. On the timescale studied (20 days), ToF‐SIMS profiles of both altered layers show water ingress. This hydration step is correlated with K leaching in aqueous media, and ²⁹Si and ²⁷Al NMR analysis of the altered structure highlights the formation of new Q⁴ and AlO₆ units. Low alkali leaching is observed in atmospheric conditions, but the altered glass structure is highly hydrolyzed, as attested by its high water and silanol content. As a result, the altered layer formed in aqueous conditions is more polymerized than the one formed in atmospheric conditions, and potentially more passivating through a mechanism involving water availability. On the bases of ²⁹Si/¹H and ²⁷Al/¹H CP‐MAS NMR experiments, the oxygen repartition is described in the altered glasses, differentiating the oxygen atoms involved in structural NBO from that of hydroxyl groups.

中文翻译：

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铅晶体玻璃的化学耐久性：90°C下短期水和大气变化的比较

在执行有关铅浸出的严格规定之后，已经广泛研究了水性介质中的水晶玻璃蚀变。然而，尽管自上古以来艺术家和工匠广泛使用铅玻璃和水晶玻璃，但很少有作品关注大气条件下的水晶玻璃腐蚀。在该初步研究中，比较了在90°C的水和大气条件下在晶体玻璃上形成的蚀变层。在研究的时间范围内（20天），两个变化层的ToF-SIMS剖面均显示出水进入。该水合步骤与水性介质中的K浸出有关，并且²⁹ Si和²⁷ Al NMR对改变结构的分析强调了新Q ⁴和AlO ₆的形成。单位。在大气条件下，碱浸出率较低，但改变后的玻璃结构高度水解，这证明了其高水含量和硅烷醇含量。结果，在水性条件下形成的蚀变层比在大气条件下形成的蚀变层更聚合，并且可能通过涉及水可利用性的机制而更多地钝化。根据²⁹ Si / ¹ H和²⁷ Al / ¹ H CP-MAS NMR实验，在改变后的玻璃中描述了氧的重新分配，从而使结构NBO中涉及的氧原子与羟基区别开来。