The mechanism of borosilicate glass corrosion revisited

Geisler, Thorsten; Nagel, T.; Kilburn, Matt R.; Janssen, André; Icenhower, Jonathan P.; Fonseca, Raúl O. C.; Grange, Marion; Nemchin, A. A.

doi:10.1016/j.gca.2015.02.039

Cited by 138 publications

(137 citation statements)

References 63 publications

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“…Geisler and co-workers have suggested that banding in the alteration layers on the surface of glass can be explained by a self-organisation process involving coupled dissolution-reprecipitation on the surface of glass. 39,40 They argue that the underlying glass dissolution is congruent throughout, but that after the initial stage of dissolution, a silica gel layer develops and as this ripens, glass dissolution continues at the interface behind a silica gel layer. This model suggests that local compositional and pH changes occur in the pore solution that is present between the silica gel layer and the glass surface, and that diffusion of the species from the pore solution to the bulk solution is limited by the silica gel layer.…”

Section: Discussionmentioning

confidence: 99%

Corrosion of the International Simple Glass under acidic to hyperalkaline conditions

et al. 2018

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Assessment of glass dissolution kinetics, under disposal relevant temperature and pH environments, is required to credibly estimate radionuclide release rates from vitrified radioactive waste. Leaching of the International Simple Glass (ISG) under acidic to hyperalkaline conditions was examined. Forward rate measurements have been obtained using the dynamic leaching SPFT protocol and rate parameters for B, Na and Si in the basic regime; errors in rates predicted using these parameters at high pH and temperature are significant because the fitting uses logarithmic data. Longer term behaviour under hyperalkaline conditions, representative of some disposal environments, was investigated using the PCT and MCC-1 static leaching protocols with Ca(OH)2 solutions for up to 120 days (PCT) and 720 days (MCC-1). In hyperalkaline conditions dissolution was incongruent for all elements and the presence of alternating zirconia-rich and zirconia-poor alteration layers was observed on all leached monoliths, indicating the occurrence of a self-organisation phenomenon during leaching.

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Section: Discussionmentioning

confidence: 99%

Corrosion of the International Simple Glass under acidic to hyperalkaline conditions

et al. 2018

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“…30,31 The relative importance of these two processes depends on the glass composition, on the pH, and more generally on the solution composition. There is still uncertainty in the domains over which the two processes dominate; however, it currently appears that dissolution/precipitation dominates under conditions far from saturation (dilute condition, very acidic, or very alkaline pH), [32][33][34] whereas in situ reorganization accounts for the formation of the surface layer when the solution is nearly saturated in silica. 35,36 A recent model suggests that dissolution/ precipitation reactions take place at the glass surface.…”

Section: Overview Of Silicate Glass Corrosionmentioning

confidence: 99%

“…122 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. Based on experimental and theoretical studies, it is likely that both mechanisms are possible for both silicate glass and ceramics, depending on a number of variables, including ceramic composition and structure, pH, temperature, and solution chemistry.…”

Section: Overview Of Silicate Glass Corrosionmentioning

confidence: 99%

“…For instance, the alteration layer of naturally weathered potassium feldspars (after~15,000 years) consists of a thin amorphous layer overlain by a variably thick (up to 1-2 μm) overcoating composed of a silica-rich, amorphous matrix enriched in crystalline phyllosilicates. 28,33,37,123 The alteration layer may also experience morphological instability upon drying and dehydration, e.g., in feldspar, leading to cracks and delamination from the crystal surface. 128 The spallation of the alteration layer from the underlying material may be important for the weathering of minerals exposed to wet and dry cycles.…”

Section: Overview Of Silicate Glass Corrosionmentioning

confidence: 99%

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A comparative review of the aqueous corrosion of glasses, crystalline ceramics, and metals

et al. 2018

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All materials can suffer from environmental degradation; the rate and extent of degradation depend on the details of the material composition and structure as well as the environment. The corrosion of silicate glasses, crystalline ceramics, and metals, particularly as related to nuclear waste forms, has received a lot of attention. The corrosion phenomena and mechanisms of these materials are different, but also have many similarities. This review compares and contrasts the mechanisms of environmental degradation of glass, crystalline ceramics, and metals, with the goal of identifying commonalities that can seed synergistic activities and advance the current knowledge in each area.npj Materials Degradation (2018) 2:15 ; doi:10.1038/s41529-018-0037-2 INTRODUCTIONNew research activity focused on the environmental degradation of silicate glasses, crystalline ceramics, and metals relevant to nuclear waste forms and containers has recently been described.

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“…2,8,9 In the second case, an interfacial dissolutionprecipitation process is proposed to explain the gel formation, notably on nuclear glass. [10][11][12] More consensually, the secondary phases are formed by the precipitation of dissolved elements of the glass and/or elements of the environment. These mechanisms are similar in saturated (liquid water) and unsaturated media (water vapor), but their relative contribution is different.…”

Section: +mentioning

confidence: 99%

Long-term weathering rate of stained-glass windows using H and O isotopes

et al. 2018

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The understanding of glass alteration is a biogeochemical, industrial, societal (radioactive waste confinement), and cultural heritage issue. Studies have been mainly performed in aqueous conditions. However, glass reactivity under hydraulically unsaturated conditions may be more important than previously recognized. In this context, we evaluate here the role of the alteration layer formed on medieval stained-glass windows on the ongoing alteration in unsaturated conditions. H 2 O adsorption isotherms were measured to study the relation between the vapor sorption and the relative humidity inside the alteration layer. From it, the average pore radius was calculated, yielding a water vapor diffusion coefficient of 7.8 × 10 -7 m² s -1 inside the pore network. Experiments using doped water vapor (D 2 18 O) confirm the vapor transport up to the alteration front via fractures and pore network. They also demonstrate that the alteration mainly progresses via an interdiffusion mechanism. The calculated interdiffusion coefficients at 20°C are 3.6 × 10 -20 m 2 s -1 at 70% RH and 4.9 × 10 -20 m 2 s -1 at 90% RH, which is similar to the values measured on model stained-glass samples altered in short durations (1-4 years). Therefore, this study highlights that, given its morphology, the alteration layer is not protective against vapor transport and interdiffusion.

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The mechanism of borosilicate glass corrosion revisited

Cited by 138 publications

References 63 publications

Corrosion of the International Simple Glass under acidic to hyperalkaline conditions

Corrosion of the International Simple Glass under acidic to hyperalkaline conditions

A comparative review of the aqueous corrosion of glasses, crystalline ceramics, and metals

Long-term weathering rate of stained-glass windows using H and O isotopes

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