{"id":{"repo_id":"aachen","oai_identifier":"oai:publications.rwth-aachen.de:58897"},"canonical_url":"https://search.dev.ndltd.org/etd/aachen/oai:publications.rwth-aachen.de:58897","repository":{"repo_id":"aachen","name":"RWTH Aachen University","base_url":"https://publications.rwth-aachen.de/oai2d"},"display":{"title":"Investigation of the corrosion behaviour of U-Al material test reactor fuel elements in repository relevant solutions and characterisation of the secondary phases formed","abstract":"The safe embedding of direct-disposed irradiated U-Al material test reactor fuel elements is the main requirement of final disposal. To clarify the behaviour under these conditions corrosion experiments with non-irradiated fuel elements and with aluminium as cladding material were performed. The results are used to explain the corrosion mechanism and characterise the corrosion products formed. Twelve corrosion experiments were performed in different media (MgCl2-brine, NaCl-brine and granite water), with iron additives (Fe^0, Fe^II) and with different surface-to-volume ratios at 90°C under anaerobic conditions. The highest corrosion rate was determined in the MgCl2-brine with iron additives. A non-irradiated plate of the U-Al fuel element had a higher corrosion rate than an aluminium plate. The corrosion products formed in the MgCl2-brine were investigated with FTIR, XRD, SEM and ICP-MS. The main elements of the secondary phases are magnesium and aluminium. All dissolved aluminium and uranium precipitated in the secondary phases. The corrosion products consist mainly of bishofite and of Mg-Al-hydrotalcite. The latter compound was identified for the first time in corrosion experiments with aluminium and non-irradiated U-Al plates. To investigate the hydrotalcite properties with respect to final disposal conditions, ion-exchanged experiments with iodide, caesium and americium were performed as well as stability experiments. CO3-hydrotalcite and Cl-hydrotalcite are able to exchange these ions. CO3-hydrotalcite is stable in a wide pH field, but in the MgCl2-brine a Cl-hydrotalcite is formed immediately. These properties make hydrotalcites attractive as possible backfill material.","abstract_html":"The safe embedding of direct-disposed irradiated U-Al material test reactor fuel elements is the main requirement of final disposal. To clarify the behaviour under these conditions corrosion experiments with non-irradiated fuel elements and with aluminium as cladding material were performed. The results are used to explain the corrosion mechanism and characterise the corrosion products formed. Twelve corrosion experiments were performed in different media (MgCl2-brine, NaCl-brine and granite water), with iron additives (Fe^0, Fe^II) and with different surface-to-volume ratios at 90°C under anaerobic conditions. The highest corrosion rate was determined in the MgCl2-brine with iron additives. A non-irradiated plate of the U-Al fuel element had a higher corrosion rate than an aluminium plate. The corrosion products formed in the MgCl2-brine were investigated with FTIR, XRD, SEM and ICP-MS. The main elements of the secondary phases are magnesium and aluminium. All dissolved aluminium and uranium precipitated in the secondary phases. The corrosion products consist mainly of bishofite and of Mg-Al-hydrotalcite. The latter compound was identified for the first time in corrosion experiments with aluminium and non-irradiated U-Al plates. To investigate the hydrotalcite properties with respect to final disposal conditions, ion-exchanged experiments with iodide, caesium and americium were performed as well as stability experiments. CO3-hydrotalcite and Cl-hydrotalcite are able to exchange these ions. CO3-hydrotalcite is stable in a wide pH field, but in the MgCl2-brine a Cl-hydrotalcite is formed immediately. These properties make hydrotalcites attractive as possible backfill material.","abstract_has_math":false,"creators":["Mazeina, Lena"],"institution":"Publikationsserver der RWTH Aachen University","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Odoj, Reinhard"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2003,"date_issued":"2003","date_published":"2003","updated_at":"2026-07-30T19:42:31Z","subjects":["info:eu-repo/classification/ddc/540","Brennelement","Uranlegierung","Aluminiumlegierung","Elektrochemische Korrosion","Korrosionsprüfung","Chemie"],"languages":["eng"],"rights":["info:eu-repo/semantics/openAccess"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-120723%22"],"render_values":[{"text":"https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-120723%22","href":"https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-120723%22","code":true}]}]},"links":{"outbound_url":"https://publications.rwth-aachen.de/record/58897","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Odoj, Reinhard"]},{"key":"dc:creator","label":"Author","values":["Mazeina, Lena"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:coverage","label":"Dc Coverage","values":["DE"]},{"key":"dc:date","label":"Dc Date","values":["2003"]},{"key":"dc:publisher","label":"Institution","values":["Publikationsserver der RWTH Aachen University"]},{"key":"dc:relation","label":"Dc Relation","values":["info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:hbz:82-opus-5837"]},{"key":"dc:type","label":"Dc Type","values":["info:eu-repo/semantics/doctoralThesis","info:eu-repo/semantics/publishedVersion"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["info:eu-repo/classification/ddc/540","Brennelement","Uranlegierung","Aluminiumlegierung","Elektrochemische Korrosion","Korrosionsprüfung","Chemie"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["info:eu-repo/semantics/openAccess"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://publications.rwth-aachen.de/record/58897","https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-120723%22"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The safe embedding of direct-disposed irradiated U-Al material test reactor fuel elements is the main requirement of final disposal. To clarify the behaviour under these conditions corrosion experiments with non-irradiated fuel elements and with aluminium as cladding material were performed. The results are used to explain the corrosion mechanism and characterise the corrosion products formed. Twelve corrosion experiments were performed in different media (MgCl2-brine, NaCl-brine and granite water), with iron additives (Fe^0, Fe^II) and with different surface-to-volume ratios at 90°C under anaerobic conditions. The highest corrosion rate was determined in the MgCl2-brine with iron additives. A non-irradiated plate of the U-Al fuel element had a higher corrosion rate than an aluminium plate. The corrosion products formed in the MgCl2-brine were investigated with FTIR, XRD, SEM and ICP-MS. The main elements of the secondary phases are magnesium and aluminium. All dissolved aluminium and uranium precipitated in the secondary phases. The corrosion products consist mainly of bishofite and of Mg-Al-hydrotalcite. The latter compound was identified for the first time in corrosion experiments with aluminium and non-irradiated U-Al plates. To investigate the hydrotalcite properties with respect to final disposal conditions, ion-exchanged experiments with iodide, caesium and americium were performed as well as stability experiments. CO3-hydrotalcite and Cl-hydrotalcite are able to exchange these ions. CO3-hydrotalcite is stable in a wide pH field, but in the MgCl2-brine a Cl-hydrotalcite is formed immediately. These properties make hydrotalcites attractive as possible backfill material."]},{"key":"dc:source","label":"Dc Source","values":["Aachen : Publikationsserver der RWTH Aachen University VIII, 116 S. : Ill., graph. Darst. (2003). = Aachen, Techn. Hochsch., Diss., 2003"]},{"key":"dc:title","label":"Title","values":["Investigation of the corrosion behaviour of U-Al material test reactor fuel elements in repository relevant solutions and characterisation of the secondary phases formed"]}]}],"canonical_facts":{"dc:contributor":["Odoj, Reinhard"],"dc:coverage":["DE"],"dc:creator":["Mazeina, Lena"],"dc:date":["2003"],"dc:description":["The safe embedding of direct-disposed irradiated U-Al material test reactor fuel elements is the main requirement of final disposal. To clarify the behaviour under these conditions corrosion experiments with non-irradiated fuel elements and with aluminium as cladding material were performed. The results are used to explain the corrosion mechanism and characterise the corrosion products formed. Twelve corrosion experiments were performed in different media (MgCl2-brine, NaCl-brine and granite water), with iron additives (Fe^0, Fe^II) and with different surface-to-volume ratios at 90°C under anaerobic conditions. The highest corrosion rate was determined in the MgCl2-brine with iron additives. A non-irradiated plate of the U-Al fuel element had a higher corrosion rate than an aluminium plate. The corrosion products formed in the MgCl2-brine were investigated with FTIR, XRD, SEM and ICP-MS. The main elements of the secondary phases are magnesium and aluminium. All dissolved aluminium and uranium precipitated in the secondary phases. The corrosion products consist mainly of bishofite and of Mg-Al-hydrotalcite. The latter compound was identified for the first time in corrosion experiments with aluminium and non-irradiated U-Al plates. To investigate the hydrotalcite properties with respect to final disposal conditions, ion-exchanged experiments with iodide, caesium and americium were performed as well as stability experiments. CO3-hydrotalcite and Cl-hydrotalcite are able to exchange these ions. CO3-hydrotalcite is stable in a wide pH field, but in the MgCl2-brine a Cl-hydrotalcite is formed immediately. These properties make hydrotalcites attractive as possible backfill material."],"dc:identifier":["https://publications.rwth-aachen.de/record/58897","https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-120723%22"],"dc:language":["eng"],"dc:publisher":["Publikationsserver der RWTH Aachen University"],"dc:relation":["info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:hbz:82-opus-5837"],"dc:rights":["info:eu-repo/semantics/openAccess"],"dc:source":["Aachen : Publikationsserver der RWTH Aachen University VIII, 116 S. : Ill., graph. Darst. (2003). = Aachen, Techn. 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