Microbial corrosion of P235GH steel under geological conditions

Abstract : The role of microbial activity on the alteration of steel containers used for nuclear waste disposal is increasingly discussed. In this work we isolated and identified sulphate-reducing bacteria (SRB) in the Callovo–Oxfordian clay rock studied as a potential host rock formation for a repository for high-level and long-lived radioactive waste in France. Then, the effect of the SRB growth on the overpack steel corrosion was investigated. The corrosion rate of the steel coupons was high under biotic conditions (not, vert, similar30 μm/year) in comparison to blank sterilized runs (not, vert, similar14 μm/year). Culture experiments in compacted conditions with clay–stone cores and steel coupons under 120 bar, simulating deep geological conditions, gave results similar to those obtained in batch experiments (e.g. production of H2S). This indicates the plausibility of SRB growth during the construction and operational phases of the repository and their survival at least temporarily after the disposal closure if water is available, which may cause fast corrosion of the steel containers under disposal conditions.
Document type :
Conference papers
Complete list of metadatas

http://hal.in2p3.fr/in2p3-00515573
Contributor : Dominique Girod <>
Submitted on : Tuesday, September 7, 2010 - 2:14:53 PM
Last modification on : Thursday, October 31, 2019 - 4:48:02 PM

Identifiers

Citation

H. El Hajj, Abdesselam Abdelouas, Bernd Grambow, C. Martin, M. Dion. Microbial corrosion of P235GH steel under geological conditions. MIGRATION 2009, 12th International Conference on the Chemistry and Migration Behaviour of Actinides and Fission Products in the Geosphere, Sep 2009, Kennewick, United States. pp.248-253, ⟨10.1016/j.pce.2010.04.007⟩. ⟨in2p3-00515573⟩

Share

Metrics

Record views

313