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Impact of alkali on the passivation of silicate glass

Journal Article · · npj Materials Degradation
 [1];  [2];  [3];  [3];  [2]
  1. Alternative Energies and Atomic Energy Commission (CEA), Bagnols-sur-Ceze (France); CEA, France
  2. Alternative Energies and Atomic Energy Commission (CEA), Bagnols-sur-Ceze (France)
  3. Univ. of Paris-Saclay, Gif-sur-Yvette (France)

Amorphous silica-rich surface layers, also called gels, can passivate silicate glass and minerals depending on environmental conditions. However, several uncertainties remain on the mechanisms controlling the formation of these layers. In this paper, the influence of exogenous ions supplied by solutions is studied, both on the formation and on the properties of the gel formed on international simple glass (ISG). ISG was altered at 90 °C, pH90 °C 7, in silica-saturated solutions containing various alkaline cations separately (Li+, Na+, K+, and Cs+). The alteration kinetics observed with Li and Na in the solution is similar to that observed with no ions, while K and Cs in the solution tend to decrease glass alteration. Furthermore, for K or Cs ions, the kinetics decreases as the ionic strength of the solution increases. The passivation layer formed in these solutions shows a selectivity toward cations following the series K > Cs > Na >> Li. These alkalis replace Ca from pristine glass in the altered structures, leading to differences in [AlO4]- units charge compensation. Importantly, exchange between Ca and alkali also affects the total quantity of water inside each gel and this effect is well correlated with the observed drop in glass alteration.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Center for Performance and Design of Nuclear Waste Forms and Containers (WastePD); French Alternative Energies and Atomic Energy Commission (CEA), Paris (France)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0016584
OSTI ID:
1668030
Journal Information:
npj Materials Degradation, Journal Name: npj Materials Degradation Journal Issue: 1 Vol. 2; ISSN 2397-2106
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (12)

Dynamics of self-reorganization explains passivation of silicate glasses journal June 2018
Spectroscopic ellipsometry study of thickness and porosity of the alteration layer formed on international simple glass surface in aqueous corrosion conditions journal July 2018
Effect of thermally induced structural disorder on the chemical durability of International Simple Glass journal September 2018
Modeling glass corrosion with GRAAL journal November 2018
Simplifying a solution to a complex puzzle journal November 2018
Influence of young cement water on the corrosion of the International Simple Glass journal January 2019
ToF-SIMS depth profiling of altered glass journal April 2019
Hydrogen bonding interactions of H2O and SiOH on a boroaluminosilicate glass corroded in aqueous solution journal January 2020
Time resolved alkali silicate decondensation by sodium hydroxide solution journal January 2020
Water diffusion in Zr‐containing fiberglass materials at room temperature journal March 2019
Dissolution of silica component of glass network at early stage of corrosion in initially silica‐saturated solution journal May 2019
Application of fiber optic reflectance spectroscopy for the detection of historical glass deterioration journal July 2019

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