Composition of Corroded Reinforcing Steel Surface in Solutions Simulating the Electrolytic Environments in the Micropores of Concrete in the Propagation Period
In the present work, the composition of a corroded reinforcing steel surface is studied at different pH values (related to different degrees of development in the corroding zones of the corrosion process) in solutions simulating chloride-contaminated environments. The media consid-ered consist of sa...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Consejo General de la Arquitectura Técnica de España (CGATE) |
| Repositorio: | RIARTE |
| OAI Identifier: | oai:www.riarte.es:20.500.12251/2867 |
| Acceso en línea: | http://hdl.handle.net/20.500.12251/2867 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85127027639&doi=10.3390%2fma15062216&partnerID=40&md5=9ceb9a0cc4b820f8f8a18c67a96ae04a |
| Access Level: | acceso abierto |
| Palabra clave: | Armaduras estructurales Corrosión Cloruros Hormigón armado Ensayos (propiedades o materiales) Resistencia mecánica 3316.13 Productos de Acero Para Construcciones 3305.32 Ingeniería de Estructuras 3312.12 Ensayo de Materiales 3312.09 Resistencia de Materiales 3303.07 Tecnología de la Corrosión |
| Sumario: | In the present work, the composition of a corroded reinforcing steel surface is studied at different pH values (related to different degrees of development in the corroding zones of the corrosion process) in solutions simulating chloride-contaminated environments. The media consid-ered consist of saturated calcium hydroxide solutions, progressively neutralized with FeCl2 or by adding 0.5 M NaCl to the solution. The results found in present work confirm higher levels of acidity in the solutions with higher concentrations of Fe2+. In the present work, emphasis is given to the composition of the oxides in solutions that simulate the conditions that exist inside of a localized corrosion pit as a consequence of the reaction of chloride on reinforcing steel. The oxides were studied using Raman and XPS techniques; the results obtained with both techniques are mutually coherent. Thus, in the passive state, the oxides found are those reported previously by other authors, while in the corroding state, the present results are more comprehensive because the conditions tested studied a variety of pore solution composition with several pH values; we tried to reproduce these values inside the pits in conditions of heavy corrosion (very acidic). The oxides found are those typically produced during iron dissolution and seem not the best route to study the corrosion process of steel in concrete; the electrochemical tests better characterize the corrosion stage. © 2022 by the authors. Licensee MDPI, Basel, Switzerland. |
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