| 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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conferencepaper
Backgrounds for Studying Impact of Different Water Environments on Welded Steels for Low and Intermediate-Level Waste Repositories in Finland
Abstract
Developing repositories for low and intermediate-level nuclear waste (LILW) is crucial to Finland's nuclear waste management. Understanding the corrosion behavior and mechanisms of engineered steel used in these repository conditions is vital for isolating the waste from the surrounding environment and reducing the risk of radiation exposure to humans and the ecosystem during both operation and decommissioning.<br/><br/>Our previous study, conducted from 2021 to 2022, explored the role of microbially-induced corrosion (MIC) on the corrosion rate and mechanisms of carbon steel (CS, DC01* AmO) and stainless-steel alloys (SS, AISI 316L) under anoxic repository conditions at 10°C in a laboratory setting. The experimental setup involved both abiotic (biocide-treated) and biotic (microbial-enriched) natural groundwater sourced from a repository in a granite bedrock in Loviisa, Finland. Over approximately 8 months, a long-term laboratory corrosion test was performed, which included electrochemical measurements such as open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), and cyclic polarizations were performed to assess the corrosion behavior of two alloys in anoxic groundwater. Additionally, various steel surface characterization techniques, along with molecular biological analyses, were used to deepen our understanding of MIC under repository conditions.<br/><br/>The electrochemical measurements revealed that local corrosion, in the form of pitting, was observed intermittently in CS both employed abiotic and biotic groundwater. The biotic conditions seemed to inhibit corrosion of CS after five months due to biofilm formation, whereas SS AISI 316L also exhibited poorer corrosion resistance compared to abiotic groundwater, suggesting that local groundwater conditions influenced corrosion tendency and form in LILW repositories. Moreover, variations in microbial communities were detected depending on the groundwater conditions (abiotic and biotic) and steel materials. Factors such as microstructural state, alloying elements, chromium or molybdenum-depleted zones, and carbide precipitations can contribute to preferential corrosive attacks, but limited information is available on these aspects. <br/><br/>Building on the results from the presented study, our future project is expanding the focus on steel welds, considering groundwater ingress and microbial activities under conditions mimicking the Finnish LILW repository. We will focus on microbe-weldment interactions on steel surfaces and assess the role of varying weldment types, material combinations, and post-treatment methods on weld durability and corrosion resistance. The study is expected to provide new insight into the literature on corrosion in welds and affected zones under different conditions representing the evolutionary stages of the LILW repository.