Electrochemical and analytical investigation of passive films formed on stainless steels in alkaline media |
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| Authors: | L. Freire M.A. Catarino M.I. Godinho M.J. Ferreira M.G.S. Ferreira A.M.P. Simões M.F. Montemor |
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| Affiliation: | 1. ICEMS – Instituto Superior Técnico, Universidade Técnica de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal;2. E.E.I., Universidade de Vigo, Campus Universitario, 36310 Vigo, Spain;3. ISEL, Departamento de Engenharia Química, Av. Conselheiro Navarro 1, 1949-014 Lisboa, Portugal;4. Universidade de Aveiro, Campus de Santiago, Aveiro, Portugal;1. School of Civil Environmental and Chemical Engineering, RMIT University, Melbourne, Australia;2. CoE-CRT, Civil Engineering Department, College of Engineering, King Saud University, Riyadh, Saudi Arabia;1. ENCOMAT Group, Universidade de Vigo, E.E.I., Campus Universitario, 36310 Vigo, Spain;2. ICEMS, Instituto Superior Técnico, UTL, Av. Rovisco Pais, 1049-001 Lisbon, Portugal;1. Key Laboratory of Coastal Disaster and Defence, Ministry of Education, College of Harbour, Coastal and Offshore Engineering, Hohai University, Nanjing 210098, Jiangsu, China;2. School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, Jiangsu, China;3. School of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China |
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| Abstract: | Passive films were grown in potentiodynamic mode, by cyclic voltammetry on AISI 316 and AISI 304 stainless steels. The composition of these films was investigated by X-ray photoelectron spectroscopy (XPS). The electrochemical behaviour and the chemical composition of the passive films formed by cyclic voltammetry were compared to those of films grown under natural conditions (by immersion at open circuit potential, OCP) in alkaline solutions simulating concrete. The study included the effect of pH of the electrolyte and the effect of the presence of chloride ions.The XPS results revealed important changes in the passive film composition, which becomes enriched in chromium and depleted in magnetite as the pH decreases. On the other hand, the presence of chlorides promotes a more oxidised passive layer. The XPS results also showed relevant differences on the composition of the oxide layers for the films formed under cyclic voltammetry and/or under OCP. |
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