The anaerobic corrosion of carbon steel in alkaline media – Phase 2 results

In the Belgian Supercontainer concept a carbon steel overpack will surround high-level waste and spent fuel containers and be encased in a cementitious buffer material. A programme of research was carried out to investigate and measure the rate of anaerobic corrosion of carbon steel in an artificial...

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Bibliographic Details
Published in:EPJ Web of conferences 2013-01, Vol.56, p.6003-06003
Main Authors: Smart, N.R., Rance, A.P., Fennell, P.A.H., Kursten, B.
Format: Article
Language:English
Subjects:
Buffers
Carbon steels
Casing (process)
Cements
Chlorides
Corrosion
Corrosion rate
Simulation
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Summary:In the Belgian Supercontainer concept a carbon steel overpack will surround high-level waste and spent fuel containers and be encased in a cementitious buffer material. A programme of research was carried out to investigate and measure the rate of anaerobic corrosion of carbon steel in an artificial alkaline porewater that simulates the aqueous phase in the cementitious buffer material. The corrosion rates were measured by monitoring hydrogen evolution using a manometric gas cell technique and by applying electrochemical methods. Phase 2 of the programme has repeated and extended previous Phase 1 measurements of the effects of radiation, temperature and chloride concentration of the anaerobic corrosion rate. This paper provides an update on the results from Phase 2 of the programme. The results confirm previous conclusions that the long-term corrosion rate of carbon steel in alkaline simulated porewater is determined by the formation of a thin barrier layer and a thicker outer layer composed of magnetite. Anaerobic corrosion of steel in cement requires an external supply of water.
ISSN:2100-014X
2100-014X
DOI:10.1051/epjconf/20135606003