 |
Tuesday, March 18, 2008 - 4:45 PM
Convention Center, Second Level, 220 (Ernest N. Morial Convention Center)
Investigation of the passive film properties of steel in concrete using electrochemical impedance spectroscopy
Concrete reinforcing steel (rebar) is naturally protected from corrosion by a passive oxide film that forms in the highly alkaline concrete. However, in-service, this film can break down and corrosion ensues, because of the effects of ingress of ions such as chloride, or processes such as carbonation. The protective properties of the passive film depend on the chemistry found in the concrete pores, and, hence, the type of concrete directly effects the onset time, and kinetics, of rebar corrosion. This study uses Electrochemical Impedance Spectroscopy (EIS) to characterize properties of the passive film formed on low-carbon deformed rebar immersed in representative pore solutions found in typical concrete types. The data were analyzed using electric-circuit models, and the effects of the pore solution on the individual circuit elements are discussed. The results provide insight into how the protective nature of the passive film depends on the composition of the pore solution to which the rebar specimens were exposed.
See more of Research in Progress - Passivity and Localized Corrosion
See more of Research in Progress
See more of The CORROSION 2008 Conference and Expo (March 16-20, 2008)
See more of Research in Progress
See more of The CORROSION 2008 Conference and Expo (March 16-20, 2008)