Volume 102, Issue 4 pp. 1652-1664
ORIGINAL ARTICLE

Effects of surface initial condition on aqueous corrosion of glass—A study with a model nuclear waste glass

Hongshen Liu

Hongshen Liu

Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania

Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania

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Dien Ngo

Dien Ngo

Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania

Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania

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Mengguo Ren

Mengguo Ren

Department of Materials Science and Engineering, University of North Texas, Denton, Texas

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Jincheng Du

Jincheng Du

Department of Materials Science and Engineering, University of North Texas, Denton, Texas

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Seong H. Kim

Corresponding Author

Seong H. Kim

Department of Chemical Engineering, The Pennsylvania State University, University Park, Pennsylvania

Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania

Correspondence

Seong H. Kim, Department of Chemical Engineering, The Pennsylvania State University, University Park, PA.

Email: [email protected]

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First published: 23 August 2018
Citations: 26

Abstract

Being a nonequilibrium material, the structure of glass varies with the sample history. Thus, the initial surface condition of a glass can vary with the preparation condition and have a large impact on its reactivity. This paper shows that the aqueous corrosion behavior of international simple glass (ISG) varies depending on the initial surface state. The ISG glass samples were prepared as-polished-only and polished-then-annealed and they were immersed in aqueous solution saturated with soluble SiO2 at 30°C (modeling a mild condition) and at 90°C (modeling a severe condition). Molecular dynamics simulations were performed to obtain coordination numbers of network formers of ISG to assist oxygen speciation calculations. The surface structures of as-prepared and corroded ISG samples were analyzed using various imaging and spectroscopic techniques. Among these analyses, only the oxygen speciation with x-ray photoelectron spectroscopy showed discernable differences between two uncorroded surfaces with different preparation histories; all other methods could not differentiate the surface preparation history before aqueous corrosion. Such minor difference in chemical structures was found to have a profound impact on corrosion behaviors in the mild condition. In the harsh condition, the surface history dependence was not as drastic as the corrosion in the mild condition. The analysis results of the corroded surfaces suggested that the thickness and structure of the alteration layer formed on ISG in aqueous corrosion can vary with the initial surface state.