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An assessment of the coulostatic method applied to the corrosion of steel in concrete
This work examines the experimental configuration, its transient response, and the formulation of tentative criteria for the consistent evaluation of the corrosion rates using coulostatic produced potential-time transients by application of short current pulses on active and passive steel in concrete. This resulted in the detection of two transient processes, the slower being strongly dependent on the condition of the steel. It is shown that the time constant of the exponential decay curve may be used to evaluate the corrosion rate of the steel. This method produces values which are similar to those obtained via DC methods of polarisation resistance determination. Furthermore, the method produces a value for the interfacial capacitance, it is insensitive to the electrolyte resistance and any effects of mass transfer during the perturbation can be minimised by ensuring that the duration of the perturbation pulse is less than 35 ms. Additional information is also obtained on the series of processes occurring at the corroding interface. The time constant itself is corrosion rate sensitive and is expected to be area insensitive. Therefore, the corrosion rate may be estimated even when the area of sample is unknown.
An assessment of the coulostatic method applied to the corrosion of steel in concrete
This work examines the experimental configuration, its transient response, and the formulation of tentative criteria for the consistent evaluation of the corrosion rates using coulostatic produced potential-time transients by application of short current pulses on active and passive steel in concrete. This resulted in the detection of two transient processes, the slower being strongly dependent on the condition of the steel. It is shown that the time constant of the exponential decay curve may be used to evaluate the corrosion rate of the steel. This method produces values which are similar to those obtained via DC methods of polarisation resistance determination. Furthermore, the method produces a value for the interfacial capacitance, it is insensitive to the electrolyte resistance and any effects of mass transfer during the perturbation can be minimised by ensuring that the duration of the perturbation pulse is less than 35 ms. Additional information is also obtained on the series of processes occurring at the corroding interface. The time constant itself is corrosion rate sensitive and is expected to be area insensitive. Therefore, the corrosion rate may be estimated even when the area of sample is unknown.
An assessment of the coulostatic method applied to the corrosion of steel in concrete
Bewertung der coulostatischen Methode für die Untersuchung der Stahlkorrosion in Beton
Glass, G.K. (author)
Corrosion Science ; 37 ; 597-605
1995
9 Seiten, 3 Bilder, 1 Tabelle, 14 Quellen
Article (Journal)
English
An assessment of the coulostatic method applied to the corrosion of steel in concrete
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