The mechanism of borosilicate glass corrosion revisited
By T. Geisler, T. Nagel, M. Kilburn, A. Janssen, J. Icenhower, R. Fonseca, M. Grange, A. Nemchin. 2015
180 citations recorded by the source corpus.
Abstract Currently accepted mechanistic models describing aqueous corrosion of borosilicate glasses are based on diffusion-controlled hydrolysis, hydration, ion exchange reactions, and subsequent re-condensation of the hydrolyzed glass network, leaving behind a residual hydrated glass or gel layer. Here, we report results of novel oxygen and silicon isotope tracer experiments with ternary Na borosilicate glasses that can be better explained by a process that involves the congruent dissolution of the glass, which is spatially and temporally coupled to the precipitation and growth of an amorphous silica layer at an inwardly moving reaction interface. Such a process is thermodynamically driven by the solubility difference between the glass and amorphous silica, and kinetically controlled by glass dissolution reactions at the reaction front, which, in turn, are controlled by the transport of water and solute elements through the growing corrosion zone. Understanding the coupling of these reactions is the key to understand the formation of laminar or more complex structural and chemical patterns observed in natural corrosion zones of ancient glasses. We suggest that these coupled processes also have to be considered to realistically model the long-term performance of silicate glasses in aqueous environments.
View Paper: https://www.semanticscholar.org/paper/7e9222c28b93d64dbdd6689b6b751c56b2d8d963
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Citations in the corpus
- A comparative review of the aqueous corrosion of glasses, crystalline ceramics, and metals (2018, background): “Two main mechanisms to explain the formation of the alteration layer on silicate minerals have been proposed and are currently under debate: dissolution–precipitation and ion exchange.(28,33,37,123) It is worth noting that these mechanisms are also under discussion for silicate glass alteration.”