| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Ratia-Hanby, Vilma L.
VTT Technical Research Centre of Finland
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (13/13 displayed)
- 2024Integrating double-labeling HCR-FISH into a multidisciplinary pipeline for biofouling assessment on austenitic stainless steel in brackish seawater circuitcitations
- 2024The evolution of subsurface deformation and tribological degradation of a multiphase Fe-based hardfacing induced by sliding contact
- 2024Backgrounds for Studying Impact of Different Water Environments on Welded Steels for Low and Intermediate-Level Waste Repositories in Finland
- 2024The effect of alloying and surface roughness on biofouling of stainless steels in Baltic Sea brackish seawater
- 2023Penetration of corrosive species into copper exposed to simulated O2-free groundwater by time-of-flight secondary ion mass spectrometry (ToF-SIMS)citations
- 2023Characterization of surface films that develop on pre-oxidized copper in anoxic simulated groundwater with sulphidecitations
- 2023Applied DNA HCR-FISH for Biofilm Distribution Imaging on Stainless Steel in Brackish Seawater
- 2021Microstructural characterisation of subsurface deformation and the degradation of Stellite 6 induced by self-mated sliding contact in a simulated PWR environmentcitations
- 2021Corrosion of copper in sulphide containing environment: the role and properties of sulphide films – Annual report 2020
- 2021Corrosion-induced microstructure degradation of copper in sulfide-containing simulated anoxic groundwater studied by synchrotron high-energy X-ray diffraction and ab-initio density functional theory calculationcitations
- 2019Research methods for the evaluation of the relevance of application oriented laboratory wear tests
- 2015Behavior of martensitic wear resistant steels in abrasion and impact wear testing conditions
- 2015The effect of impact conditions on the wear and deformation behavior of wear resistant steelscitations
Places of action
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report
Corrosion of copper in sulphide containing environment: the role and properties of sulphide films – Annual report 2020
Abstract
In COCOS project, the role and properties of sulphide films on copper surface are studied. OFP-copper samples were exposed to sulfide-containing anoxic simulat-ed groundwater for different durations. In 2020, the second year of the COCOS project, the work continued with characterization of previously exposed OFP-copper samples by new techniques. Also, new 9-month long exposure tests were started with sulphide concentrations ranging from 0 to 320 mg/L. The electrochemical measurements were conducted across the duration of the exposure test. As a result, trends in corrosion behaviour of copper was seen throughout the test. EIS results indicated the formation of the different corrosion product films on sample surfaces exposed. The protective effect of surface layers changes with time of exposure, and the behaviour is influenced by the amount of sulphide in the environment. A distinct and sharp increases in the open circuit po-tential values of copper samples were observed in some cases during the test. These were more common in environments with low sulphide amount and may be related to time when sulphide has been consumed by chemical reactions. The observation will be further studied in future. Corrosion rate of samples exposed to 0 mg/L, 32 mg/L and 320 mg/L of sulphide was determined also by measuring mass loss during 4-month test. One interest-ing finding was that the highest corrosion rates, ca. 0.4 µm/a, were obtained for samples exposed to sulphide content of 32 mg/L. Sample characterisation showed that the highest mass loss was most likely due to local defects on the samples, not uniform corrosion. HEXRD studies revealed significant lattice changes as deformation extending several hundreds of micrometers into the bulk. This is attributed to H infusion. The results demonstrate the risk for H-induced stress corrosion cracking of copper as canister material during long-term storage of nuclear fuel when exposed to sulfide-containing groundwater. The last year of the project is going on at the moment. Longer term experiments have been performed. Further analysis of new samples and data from electro-chemical measurements from longer exposures continues. Also, the last new ex-perimental tests will be conducted in 2021.