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Formation of hydrotalcite-like compounds during corrosion experiments on MTR-FE-Al cladding

Published online by Cambridge University Press:  09 July 2018

L. Mazeina ,
H. Curtius  and
J . Fachinger
L. Mazeina*
Affiliation:
Institute for Safety Research and Reactor Technology, Research Centre Jü lich, 52425 Jülich, Germany
H. Curtius
Affiliation:
Institute for Safety Research and Reactor Technology, Research Centre Jü lich, 52425 Jülich, Germany
J . Fachinger
Affiliation:
Institute for Safety Research and Reactor Technology, Research Centre Jü lich, 52425 Jülich, Germany
*
*E-mail: L.Mazeina@fz-juelich.de
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Abstract

Hydrotalcite-like compounds (HTlc) were found as secondary products in two corrosion experiments performed with Al plates in highly concentrated solutions (MgCl2-saturated brine) in the presence of metallic and soluble iron at 90ºC under an Ar atmosphere. The durations of the experiments were ∼10 and 13 months, respectively. To investigate the corrosion experiments, solution and gas samples were collected and the main parameters measured. The solid and liquid samples obtained were analysed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and ICP-OES. The presence of the hydrotalcite-like phase was confirmed by XRD and SEM. In one experiment HTlc was found only after dialysis. Formation of the hydrotalcite-like phase was observed at lower pH than mentioned in the literature. These results are useful in understanding the long-term behaviour of corrosion products of reactor fuel elements in relation to their possible barrier function and to comprehend the long-term behaviour of this type of waste during its final disposal.

Keywords

Al claddingmaterial test reactor fuel elementsMgCl2 brinehydrotalcite
Type
Research Article
Information
Clay Minerals , Volume 38 , Issue 1 , March 2003 , pp. 35 - 40
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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