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Title: Corrosion Behavior and Microstructure Influence of Glass-Ceramic Nuclear Waste Forms

Abstract

Glass ceramic waste forms present a potentially viable technology for the long term immobilization and disposal of liquid nuclear wastes. Through control of chemistry during fabrication, such waste forms can have designed secondary crystalline phases within a borosilicate glass matrix. In this work, a glass ceramic containing powellite and oxyapatite secondary phases was tested for its corrosion properties in dilute conditions using single pass flow through testing (SPFT). Three glass ceramic samples were prepared using different cooling rates to produce samples with varying microstructure sizes. In testing at 90 °C in buffered pH 7 and pH 9 solutions, it was found that increasing pH and decreasing microstructure size (resulting from rapid cooling during fabrication) both led to a reduction in overall corrosion rate. The phases of the glass ceramic were found, using a combination of solutions analysis, SEM and AFM, to corrode preferably in the order of powellite > bulk glass matrix > oxyapatite.

Authors:
 [1];  [1];  [1];  [1]
  1. Pacific Northwest National Laboratory, 902 Battelle Blvd, Richland, WA.
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1398165
Report Number(s):
PNNL-SA-121385
Journal ID: ISSN 0010-9312; 49141; AF5805020
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Corrosion; Journal Volume: 73; Journal Issue: 11
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory

Citation Formats

Matthew Asmussen, R., Neeway, James J., Kaspar, Tiffany C., and Crum, Jarrod V. Corrosion Behavior and Microstructure Influence of Glass-Ceramic Nuclear Waste Forms. United States: N. p., 2017. Web. doi:10.5006/2449.
Matthew Asmussen, R., Neeway, James J., Kaspar, Tiffany C., & Crum, Jarrod V. Corrosion Behavior and Microstructure Influence of Glass-Ceramic Nuclear Waste Forms. United States. doi:10.5006/2449.
Matthew Asmussen, R., Neeway, James J., Kaspar, Tiffany C., and Crum, Jarrod V. Fri . "Corrosion Behavior and Microstructure Influence of Glass-Ceramic Nuclear Waste Forms". United States. doi:10.5006/2449.
@article{osti_1398165,
title = {Corrosion Behavior and Microstructure Influence of Glass-Ceramic Nuclear Waste Forms},
author = {Matthew Asmussen, R. and Neeway, James J. and Kaspar, Tiffany C. and Crum, Jarrod V.},
abstractNote = {Glass ceramic waste forms present a potentially viable technology for the long term immobilization and disposal of liquid nuclear wastes. Through control of chemistry during fabrication, such waste forms can have designed secondary crystalline phases within a borosilicate glass matrix. In this work, a glass ceramic containing powellite and oxyapatite secondary phases was tested for its corrosion properties in dilute conditions using single pass flow through testing (SPFT). Three glass ceramic samples were prepared using different cooling rates to produce samples with varying microstructure sizes. In testing at 90 °C in buffered pH 7 and pH 9 solutions, it was found that increasing pH and decreasing microstructure size (resulting from rapid cooling during fabrication) both led to a reduction in overall corrosion rate. The phases of the glass ceramic were found, using a combination of solutions analysis, SEM and AFM, to corrode preferably in the order of powellite > bulk glass matrix > oxyapatite.},
doi = {10.5006/2449},
journal = {Corrosion},
number = 11,
volume = 73,
place = {United States},
year = {Fri Jun 16 00:00:00 EDT 2017},
month = {Fri Jun 16 00:00:00 EDT 2017}
}