Journal
PHYSICS AND CHEMISTRY OF THE EARTH
Volume 36, Issue 17-18, Pages 1624-1629Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pce.2011.10.018
Keywords
Biocorrosion; H-2; Iron-reducing bacteria; Deep geological waste disposal
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In deep geological environments foreseen for the disposal of radioactive waste, metallic containers will undergo anaerobic corrosion. In this context, the formation of corrosion products such as magnetite may reduce the rate of corrosion processes through the formation of a protective layer. This study aims at determining the direct impact of iron-reducing bacteria (IRB) activity on the stability of corrosion protective layers. Batch experiments investigating iron corrosion processes including the formation of secondary magnetite and its subsequent alteration in the presence of IRB show the bacteria ability to use structural Fe(III) for respiration which leads to the sustainment of a high corrosion rate. With the bioreduction of corrosion products such as magnetite, and H-2 as electron donor, IRB promote the reactivation of corrosion processes in corrosive environments by altering the protective layer. This phenomenon could have a major impact on the long-term stability of metallic compounds involved in multi-barrier system for high-level radioactive waste containment. (C) 2011 Elsevier Ltd. All rights reserved.
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