EIS study of passivation of austenitic and duplex stainless steels reinforcements in simulated pore solutions |
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| Affiliation: | 1. Universidad Carlos III de Madrid, Materials Science and Engineering Department, Avda, Universidad 30, 28911 Leganés, Madrid, Spain;2. Laboratoires Interfaces et Systèmes Electrochimiques, UPR-15 du CNRS, UPMC, Casier 133, 4 Place Jussieu, 75252 Paris Cedex 05, France;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;1. Metallurgical and Materials Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad 91775-1111, Iran;2. Materials Engineering Department, Hakim Sabzevari University, Sabzevar, Iran;1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China;2. Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, China;3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China;1. Sorbonne Universités, UPMC Univ Paris 06, CNRS, Laboratoire Interfaces et Systèmes Electrochimiques, 4 place Jussieu, F-75005, Paris, France;2. Department of Chemical Engineering, University of Florida, Gainesville, Florida 32611, USA;1. Vrije Universiteit Brussel (VUB), Department of Chemistry and Materials, Research Group of Electrochemical and Surface Engineering (SURF), Pleinlaan 2, 1050 Brussels, Belgium;2. Polytechnic Department of Engineering and Architecture, University of Udine, Via del Cotonificio, 108-33100 Udine, Italy |
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| Abstract: | Stainless steel reinforcements have proved to be one of the most effective methods to guarantee the passivity of reinforced concrete structures exposed to highly chloride-contaminated atmospheres. In the present work, the corrosion behaviour of two traditional austenitic stainless steels (AISI 304 and 316L types), and one duplex type (2205) are compared with that of a low-nickel, much more economic, austenitic type (204Cu). Ribbed and ground bars of these four materials are studied in non-carbonated and carbonated, saturated Ca(OH)2 solutions with different chloride contents, using electrochemical techniques. The low-frequency time constant represents the charge transfer resistance (Rt) in parallel with the double layer capacitance. The Rt value of the passive reinforcements seems to be related with the quality of the passive layer. Rt values increase with the immersion time in the testing solutions and decrease with the chloride content. Moreover, Rt tends to increase when the ribs of the bars are removed. |
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