Korrosionsverhalten von metallischen
und nichtmetallischen Werkstoffen in
verschiedenen Medien im Anhydrit- und
Gipsbergwerk Felsenau/AG
(out of print)
Summary
The final underground disposal of radioactive waste necessitates container materials with a good long-term resistance against corrosion from both external agents and the solidification matrix inside. For low- and medium level active waste, repositories in anhydrite sites, among others, are
under consideration.
Sheet and plate samples from 14 metallic and 8 non-metallic materials have been tested for 5 years in a tunnel in the Anhydrite and Gypsum Mine Felsenau/AG for their corrosion resistance in the tunnel atmosphere, anhydrite powder, gypsum powder, gypsum, and cement.
From the metallic materials tested, only chromium-nickel steel is corrosion resistant to all the media present. Zinc plated and tin plated iron sheet as well as aluminium and aluminium alloys are corrosion resistant only in the atmosphere of the tunnel, and lead plated iron sheet is resistant also in cement. Aluminium is dissolved in cement.
Uncovered iron sheet undergoes severe corrosion. The non-metallic coatings tested (laquer, stove laquer, or synthetic resins) partially flake off already after one year's testing and are therefore not appropriate for iron sheet corrosion protection.
No influence of the different media has been observed after 5 years on the 8 plastic materials tested (6 without, and 2 with glass fibre reinforcement).
back
