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    The mechanism of borosilicate glass corrosion revisited

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    Authors
    Geisler, T.
    Nagel, T.
    Kilburn, M.
    Janssen, A.
    Icenhower, J.
    Fonseca, R.
    Grange, M.
    Nemchin, Alexander
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Geisler, T. and Nagel, T. and Kilburn, M. and Janssen, A. and Icenhower, J. and Fonseca, R. and Grange, M. et al. 2015. The mechanism of borosilicate glass corrosion revisited. Geochimica et Cosmochimica Acta. 158: pp. 112-129.
    Source Title
    Geochimica et Cosmochimica Acta
    DOI
    10.1016/j.gca.2015.02.039
    ISSN
    0016-7037
    School
    Department of Applied Geology
    URI
    http://hdl.handle.net/20.500.11937/34018
    Collection
    • Curtin Research Publications
    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.

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