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In situ 3D monitoring of corrosion on carbon steel and ferritic stainless steel embedded in cement paste
In a X-ray microcomputed tomography study, active corrosion was induced by galvanostatically corroding steel embedded in cement paste. The results give insight into corrosion product build up, crack formation, leaching of products into the cracks and voids, and differences in morphology of corrosion attack in the case of carbon steel or stainless steel reinforcement. After a passivity period where no sign of corrosion was seen, the surface of the steel reinforcement was progressively etched away, and the corrosion products accumulated at the steel/concrete interface. When they reached a certain pressure, the cement paste fractured, and cracks propagated in the concrete matrix. The corrosion products then propagated outward along the cracks, eventually depositing on the walls of the cracks. With respect to the morphology, carbon steel showed a homogeneous corrosion, with the entire surface gradually etched away. Conversely, ferritic stainless steel corroded locally, with the formation of corrosion pits distributing over a quarter of its surface. The deepest pit in the case of carbon steel was about 6 times greater than the average general penetration depth, and in the case of ferritic stainless steel, 12 times greater. After depassivation of steel, the average rate of steel loss measured by µCT correlated well with the rate predicted by Faraday's law of electrolysis. Localised corrosion attack observed on ferritic stainless steel specimen led to concentrations of stresses that caused wider cracks in the cement paste compared to the generalized corrosion of carbon steel. Corrosion was induced by strong levels of current flow, and corrosion products were attracted away from the steel surface by strong electrical migration. This prevented their further accumulation at the steel surface.
In situ 3D monitoring of corrosion on carbon steel and ferritic stainless steel embedded in cement paste
In a X-ray microcomputed tomography study, active corrosion was induced by galvanostatically corroding steel embedded in cement paste. The results give insight into corrosion product build up, crack formation, leaching of products into the cracks and voids, and differences in morphology of corrosion attack in the case of carbon steel or stainless steel reinforcement. After a passivity period where no sign of corrosion was seen, the surface of the steel reinforcement was progressively etched away, and the corrosion products accumulated at the steel/concrete interface. When they reached a certain pressure, the cement paste fractured, and cracks propagated in the concrete matrix. The corrosion products then propagated outward along the cracks, eventually depositing on the walls of the cracks. With respect to the morphology, carbon steel showed a homogeneous corrosion, with the entire surface gradually etched away. Conversely, ferritic stainless steel corroded locally, with the formation of corrosion pits distributing over a quarter of its surface. The deepest pit in the case of carbon steel was about 6 times greater than the average general penetration depth, and in the case of ferritic stainless steel, 12 times greater. After depassivation of steel, the average rate of steel loss measured by µCT correlated well with the rate predicted by Faraday's law of electrolysis. Localised corrosion attack observed on ferritic stainless steel specimen led to concentrations of stresses that caused wider cracks in the cement paste compared to the generalized corrosion of carbon steel. Corrosion was induced by strong levels of current flow, and corrosion products were attracted away from the steel surface by strong electrical migration. This prevented their further accumulation at the steel surface.
In situ 3D monitoring of corrosion on carbon steel and ferritic stainless steel embedded in cement paste
In situ 3D-Überwachung der Korrosion von Kohlenstoffstahl und ferritischem nichtrostendem Stahl in Zementpaste
Itty, Pierre-Adrien (author) / Serdar, Marijana (author) / Meral, Cagla (author) / Parkinson, Dula (author) / MacDowell, Alastair A. (author) / Bjegovic, Dubravka (author) / Monteiro, Paulo J.M. (author)
Corrosion Science ; 83 ; 409-418
2014
10 Seiten, 9 Bilder, 2 Tabellen, 45 Quellen
Article (Journal)
English
kohlenstoffreicher Stahl , nichtrostender Stahl , Korrosionsart , Korrosionsprodukt , Korrosionsmechanismus , Computertomographie , dreidimensionale Darstellung , Zement , intensiostatische Prüfung , Rissausbildung , Mikrohohlraum , Oberflächenschicht , Passivierung , Lochfraßkorrosion , Grenzflächeneigenschaft , Eindringtiefe , Chromstahl
| British Library Online Contents | 2014
| BASE | 2014
Three-dimensional characterization of steel corrosion embedded in cement paste
| British Library Online Contents | 2017
Three-dimensional characterization of steel corrosion embedded in cement paste
| British Library Online Contents | 2017
Three-dimensional characterization of steel corrosion embedded in cement paste
| Online Contents | 2017