In situ corrosion of canister materials in bentonite: the IC-A experiment at Mont Terri
2021
Abstract. Since 2012, a long-term in situ corrosion experiment (IC-A) has been
conducted in the Mont Terri Underground Research Laboratory in
Switzerland. The aims of the project with international partners are
to confirm the long-term anaerobic corrosion rate of carbon steel and
copper in compacted bentonite under repository-relevant environmental
conditions, to gather in situ corrosion data supporting canister
lifetime predictions, to provide confirmation of the effect of the
bentonite buffer on microbial activity and microbially influenced
corrosion, and to study the effects of welding (steel) and deposition
technique (copper) on the corrosion properties of these candidate
materials for disposal canisters. To date, carbon steel and cold
sprayed and electrodeposited copper coatings have been retrieved after
different exposure periods up to 3 years and characterised to
establish the composition of the corrosion product, the morphology of
the corroded surface, and to measure the rate of corrosion. For carbon
steel specimens, a complex corrosion product was identified,
consisting predominantly of magnetite. Low average anaerobic corrosion
rates were measured for carbon steel and a very modest amount of
alteration was identified on copper. The density and the initial form
of the bentonite had a small influence on the rate of corrosion,
across all materials.
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