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Experimental investigation of the effects of aqueous species on the dissolution kinetics of R7T7 glass; Etude experimentale de l`influence d`especes aqueuses sur la cinetique de dissolution du verre nucleaire R7T7

Abstract

This contribution to the study of aqueous corrosion of the French ``R7T7`` reference nuclear containment glass includes a bibliographic survey of prior investigations, highlighting the problems encountered in interpreting the interactions in systems containing clay materials in contact with the glass. An experimental methodology is proposed to investigate the effects of inorganic aqueous species separately from those of a few organic acids on the dissolution mechanisms and kinetics of R7T7 glass at 90 deg. C. The experimental results discussed support the idea that several glass network forming elements may have a kinetically limiting role. The most likely hypothesis to account for the absence of saturation conditions with respect to the glass in certain clay media involves the formation of complexes with kinetically limiting metallic elements such as aluminum released by glass corrosion. This work contributes to a better understanding of the basic mechanisms of nuclear glass dissolution in a geological repository environment. It facilitates the interpretation of glass alteration studies in realistic or actual solutions and may contribute to specifying near field chemical barriers in the form of additives (amorphous silica, aluminum hydroxides or phosphates) around the glass disposal package to enhance the stability of the glass matrix. (author). 148  More>>
Authors:
Publication Date:
Oct 01, 1994
Product Type:
Thesis/Dissertation
Report Number:
FRCEA-TH-493
Reference Number:
SCA: 360604; 052002; PA: AIX-27:070232; EDB-96:157363; NTS-97:002822; SN: 96001683452
Resource Relation:
Other Information: TH: These (D. es Sc.).; PBD: Oct 1994
Subject:
36 MATERIALS SCIENCE; 05 NUCLEAR FUELS; BOROSILICATE GLASS; DISSOLUTION; MATERIALS TESTING; CHEMICAL REACTION KINETICS; CARBOXYLIC ACIDS; FULVIC ACIDS; HUMIC ACIDS; POTASSIUM HYDROXIDES; SODIUM HYDROXIDES; RADIOACTIVE WASTE DISPOSAL; PH VALUE; TEMPERATURE RANGE 0273-0400 K
OSTI ID:
385078
Research Organizations:
CEA Centre d`Etudes de la Vallee du Rhone, 30 - Marcoule (France). Dept. d`Exploitation du Retraitement et de Demantelement; Poitiers Univ., 86 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE97602575; TRN: FR9602841070232
Availability:
INIS; OSTI as DE97602575
Submitting Site:
FRN
Size:
215 p.
Announcement Date:
Nov 12, 1996

Citation Formats

Gin, S. Experimental investigation of the effects of aqueous species on the dissolution kinetics of R7T7 glass; Etude experimentale de l`influence d`especes aqueuses sur la cinetique de dissolution du verre nucleaire R7T7. France: N. p., 1994. Web.
Gin, S. Experimental investigation of the effects of aqueous species on the dissolution kinetics of R7T7 glass; Etude experimentale de l`influence d`especes aqueuses sur la cinetique de dissolution du verre nucleaire R7T7. France.
Gin, S. 1994. "Experimental investigation of the effects of aqueous species on the dissolution kinetics of R7T7 glass; Etude experimentale de l`influence d`especes aqueuses sur la cinetique de dissolution du verre nucleaire R7T7." France.
@misc{etde_385078,
title = {Experimental investigation of the effects of aqueous species on the dissolution kinetics of R7T7 glass; Etude experimentale de l`influence d`especes aqueuses sur la cinetique de dissolution du verre nucleaire R7T7}
author = {Gin, S}
abstractNote = {This contribution to the study of aqueous corrosion of the French ``R7T7`` reference nuclear containment glass includes a bibliographic survey of prior investigations, highlighting the problems encountered in interpreting the interactions in systems containing clay materials in contact with the glass. An experimental methodology is proposed to investigate the effects of inorganic aqueous species separately from those of a few organic acids on the dissolution mechanisms and kinetics of R7T7 glass at 90 deg. C. The experimental results discussed support the idea that several glass network forming elements may have a kinetically limiting role. The most likely hypothesis to account for the absence of saturation conditions with respect to the glass in certain clay media involves the formation of complexes with kinetically limiting metallic elements such as aluminum released by glass corrosion. This work contributes to a better understanding of the basic mechanisms of nuclear glass dissolution in a geological repository environment. It facilitates the interpretation of glass alteration studies in realistic or actual solutions and may contribute to specifying near field chemical barriers in the form of additives (amorphous silica, aluminum hydroxides or phosphates) around the glass disposal package to enhance the stability of the glass matrix. (author). 148 refs., 40 figs., 32 tabs., 1 append.}
place = {France}
year = {1994}
month = {Oct}
}