A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Obtaining impedance information on the steel-concrete interface
Corrosion of steel in concrete can be assessed using a number of techniques. In the present work, impedance spectra were obtained by transforming time domain coulostatic transient data into frequency domain. This minimized the risk of perturbation-induced mass transfer in the electrolyte affecting the results as no perturbing current flowed while the potential transient was recorded. Furthermore, the low-frequency real axis intercept was given by the area under the potential transient divided by the charge in the perturbation. Parameters obtained from this analysis were compared with those determined by curve fitting analysis of potentiostatic and coulostatic transients using a simple model of the interface. Differences in the polarization resistance (Rp) values were generally within the error attributed to the Rp method of corrosion rate (Icorr) determination. The range of interfacial capacitance (C) was dependent on the method used. However, in all cases, lower values were estimated when the passive film was intact. Impedance spectra obtained on actively corroding specimens were more depressed then those obtained on passive specimens. This might have resultet from a greater position dependence of C and Rp when the partial breakdown of the passive film occurred.
Obtaining impedance information on the steel-concrete interface
Corrosion of steel in concrete can be assessed using a number of techniques. In the present work, impedance spectra were obtained by transforming time domain coulostatic transient data into frequency domain. This minimized the risk of perturbation-induced mass transfer in the electrolyte affecting the results as no perturbing current flowed while the potential transient was recorded. Furthermore, the low-frequency real axis intercept was given by the area under the potential transient divided by the charge in the perturbation. Parameters obtained from this analysis were compared with those determined by curve fitting analysis of potentiostatic and coulostatic transients using a simple model of the interface. Differences in the polarization resistance (Rp) values were generally within the error attributed to the Rp method of corrosion rate (Icorr) determination. The range of interfacial capacitance (C) was dependent on the method used. However, in all cases, lower values were estimated when the passive film was intact. Impedance spectra obtained on actively corroding specimens were more depressed then those obtained on passive specimens. This might have resultet from a greater position dependence of C and Rp when the partial breakdown of the passive film occurred.
Obtaining impedance information on the steel-concrete interface
Gewinnung von Impedanzinformationen von der Grenzfläche Stahl-Beton
Glass, G.K. (author) / Hassanein, A.M. (author) / Buenfeld, N.R. (author)
Corrosion, Houston ; 54 ; 887-897
1998
11 Seiten, 6 Bilder, 1 Tabelle, 32 Quellen
Article (Journal)
English
Betonstahl , Armierung , Stahlbeton , Korrosionsgeschwindigkeit , Korrosionsprüfung , galvanostatische Prüfung , potentiostatische Prüfung , Scheinwiderstand , Korrosionsstrom , Ersatzschaltbild , Frequenzgang , Bode-Diagramm , Ortskurve , Laplace-Transformation , Coulometrie , Passivierung , Grenzfläche , Impedanzspektroskopie , Passivschicht
Obtaining Impedance Information on the Steel-Concrete Interface
| British Library Online Contents | 1998
Characterisation of steel/concrete interface by electrochemical impedance spectroscopy
| British Library Online Contents | 1994
Characterisation of steel/concrete interface by electrochemical impedance spectroscopy
| Tema Archive | 1994
Comparing the Steel-Concrete Interface State and its Electrochemical Impedance
| British Library Online Contents | 1996
Comparing the Steel-Concrete Interface State and its Electrochemical Impedance
| Online Contents | 1996