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Corrosion of Construction Materials in Clay Environments*

Published online by Cambridge University Press:  15 February 2011

Jozef Dresselaers ,
Florent Casteels  and
Hugo Tas
Jozef Dresselaers
Affiliation:
SCK/CEN Studiecentrum voor Kernenergie, Boeretang 200, B-2400 Belgium
Florent Casteels
Affiliation:
SCK/CEN Studiecentrum voor Kernenergie, Boeretang 200, B-2400 Belgium
Hugo Tas
Affiliation:
SCK/CEN Studiecentrum voor Kernenergie, Boeretang 200, B-2400 Belgium
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Abstract

The corrosion rate and mechanism of construction materials of galleries and casings for boreholes (possibly to be used as consumable overpack of HLW canisters) have been evaluated after a first campaign of corrosion experiments in direct contact with clay, in a humid clay atmosphere and in a gas corrosion chamber. The envisaged construction material is ductile iron (grade 60) and has been tested with and without metallic and organic coatings. The corrosion mechanism is governed by the formation of a rust scale composed of Fe3O4 and C. Preferential attack underneath the surface reaction layer is associated with the progress of a reaction front at the interface between the graphic nodules or flakes and the ferritic or pearlitic structure.

Post-corrosion analyses of old gray iron coal mine shafts exposed for 60 and 90 years in well defined conditions are included to validate the use of the results of the short-time tests for very long exposure times.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 6: Symposium D – Scientific Basis for Nuclear Waste Management IV , 1981 , 311
Copyright
Copyright © Materials Research Society 1982

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Footnotes

*

Work performed under contract with the commission of the European Communities,Brussels

References

REFERENCES

1 Heremans, R. : Belgian working draft on a repository of solidified nuclear waste in a deep tertiary clay formation (INFCE document)(1979)Google Scholar
2 Casteels, F., Tas, H., Brabers, M., Heremans, R. : Canister materials for the storage of radioactive waste in a geological clay formation. Conference ‘Chemistry and Process Engineering of HLW solidification’ Jülich 1–5/6/1981 Google Scholar
3 Schlegel, H.G. : Allgemeine Microbiologie. Geory Thienne Verlag Stutt. 1981 (p. 300 – 307)Google Scholar
4 Sears, E.C. : Comparison of the soil corrosion resistance of ductile iron pipe and grey cast iron Material Protection, October 1968 (33 – 36)Google Scholar
5 Casteels, F. : Korrosie van gietijzers in klei. S.C.K. Internal Report (1980)Google Scholar