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Corrosion study of carbon steels in contact with alkaline pore water saturated cement-bentonite grout or cement paste at deep geological disposal conditionsZajec, Bojan ...Several national concepts for the geological disposal of nuclear waste are based on cement-bentonite grout or cement paste as a backfill material in clayey host rock. After certain exchange time, the ... chemical composition of the solution saturating the grout material will correspond to a mixture of native grout pore water and natural argillaceous rock pore water. This solution may not have sufficiently high pH to warrant the passivity of carbon steel overpack, particularly due to the dilution by argillaceous pore water. Our study will investigate two types of carbon steel associated to different chemical composition and also microstructure. The outcome of several types of experiments, all carried out in anoxic conditions, will be presented: Electrochemical characterization of both steels in synthetic groundwater (pH ? 11 and pH ? 13.4) at several temperatures (room temperature, 37°C and 80°C). This comprises open circuit potential measurement, linear polarization resistance, electrical impedance measurement and potentiodynamic polarization scan. Periodic in-situ electrochemical characterization (open circuit potential measurement and linear polarization resistance) of both metals while immersed in the synthetic groundwater being in contact with the solid cement-bentonite grout, at high temperature. It is expected that these long-term measurements would reveal the temporal evolution of the possible passivity breakdown. The true extent of the corrosion damage can only be revealed after the exposure unless the electrical resistance sensors are being used for corrosion monitoring. Our in-house developed electrical resistance sensors for corrosion measurement will be immersed in the synthetic groundwater being in contact with the solid cement-bentonite grout, at several temperatures. This will help to monitor the intensity of corrosion damage (average depth of corrosion damage) during the long term exposure.Source: Book of abstracts : 31st International Conference Nuclear Energy for New Europe : NENE 2022 : September 12-15, 2022, Portorož, Slovenia (Str. 58)Type of material - conference contribution ; adult, seriousPublish date - 2022Language - englishCOBISS.SI-ID - 174040067
Author
Zajec, Bojan |
Močnik, Petra, 1985- |
Legat, Andraž |
Goethals, Jules |
Witterbroodt, Charles |
Detilleux, Valéry |
Kosec, Tadeja
Topics
korozija |
spremljanje korozije |
bentonit |
uporovni senzorji |
globoko geološko odlagališče |
jedrski odpadki |
corrosion |
corrosion monitoring |
bentonite |
electrical resistance sensors |
deep geological disposal |
nuclear waste
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Zajec, Bojan | 20335 |
Močnik, Petra, 1985- | 37699 |
Legat, Andraž | 08281 |
Goethals, Jules | ![]() |
Witterbroodt, Charles | ![]() |
Detilleux, Valéry | ![]() |
Kosec, Tadeja | 22315 |
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