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Long-term corrosion behaviour of stainless reinforcing steel in mortar exposed to chloride environment
Long-term corrosion behaviour of six stainless reinforcing steels embedded in mortar and exposed to chloride media was monitored by electrochemical impedance spectroscopy at the open circuit potential during the period of 2 years. Corrosion behaviour of studied steels was divided into two phases characterized by different interfacial behaviour: (i) passive phase and (ii) pitting propagation phase. The interfacial behaviour of steels was discussed within the frames of physical meaning of equivalent electrical circuit used and the parameters obtained by the fitting procedure. The enhancement of the charge transfer resistance and double layer capacitance with time was attributed to the growth of the passive film at the steel surface during the passivity period. Sudden decrease of the charge transfer resistance accompanied with increase of the double layer capacitance was associated with pitting onset and accumulation of the corrosion products at the pitted sites. Duplex steel 1.4362 showed very good corrosion performance similar to common austenitic steel 1.4401. Superior corrosion performance of this steel was attributed to the good protective properties of the passive film, enriched with Cr, Ni and Mo. Steel types with low Ni content but with high N and Mn content, 1.4597 and 1.4162, show good long-term corrosion performance compared to steel 1.4003, but relatively lower corrosion resistance when compared to common austenitic steels, 1.4401 and 1.4301.
Long-term corrosion behaviour of stainless reinforcing steel in mortar exposed to chloride environment
Long-term corrosion behaviour of six stainless reinforcing steels embedded in mortar and exposed to chloride media was monitored by electrochemical impedance spectroscopy at the open circuit potential during the period of 2 years. Corrosion behaviour of studied steels was divided into two phases characterized by different interfacial behaviour: (i) passive phase and (ii) pitting propagation phase. The interfacial behaviour of steels was discussed within the frames of physical meaning of equivalent electrical circuit used and the parameters obtained by the fitting procedure. The enhancement of the charge transfer resistance and double layer capacitance with time was attributed to the growth of the passive film at the steel surface during the passivity period. Sudden decrease of the charge transfer resistance accompanied with increase of the double layer capacitance was associated with pitting onset and accumulation of the corrosion products at the pitted sites. Duplex steel 1.4362 showed very good corrosion performance similar to common austenitic steel 1.4401. Superior corrosion performance of this steel was attributed to the good protective properties of the passive film, enriched with Cr, Ni and Mo. Steel types with low Ni content but with high N and Mn content, 1.4597 and 1.4162, show good long-term corrosion performance compared to steel 1.4003, but relatively lower corrosion resistance when compared to common austenitic steels, 1.4401 and 1.4301.
Long-term corrosion behaviour of stainless reinforcing steel in mortar exposed to chloride environment
Langzeitkorrosionsverhalten von nichtrostendem Armierungsstahl in Chloridmedien ausgesetztem Mörtel
Serdar, Marijana (author) / Zulj, Lidija Valek (author) / Bjegovic, Dubravka (author)
Corrosion Science ; 69 ; 149-157
2013
9 Seiten, 7 Bilder, 5 Tabellen, 33 Quellen
Article (Journal)
English
nichtrostender Stahl , Stahlarmierung , Stahlbeton , Langzeitmessung , Korrosionsverhalten , Lochfraßkorrosion , Chlorid , Passivität , Passivitätsdurchbruch , elektrochemische Impedanzspektrometrie , Ersatzschaltbild , Potenzialzeitkurve , Werkstoffvergleich , Chromstahl , Chrom-Nickel-Stahl , Chrom-Nickel-Molybdän-Stahl , Chrom-Mangan-Stahl
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