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The analysis of potentiostatic transients applied to the corrosion of steel in concrete
Potentiostatically induced current transients obtained on a range of reinforced concrete specimens were analysed to give estimates of the polarisation resistance and interfacial capacitance. The polarisation resistance was compared with the values obtained using more conventional DC methods of analysis and, while it was consistently lower, it was within the error normally attributed to the polarisation resistance method of corrosion rate determination. The interfacial capacitance values determined increased from 0.44 F m-2 for passive steel (polarisation resistance of 132 Ohm m2) to 26.5 F m-2 for active steel (polarisation resistance of 0.34 Ohm m2). This has a dominant effect on the time required for potentiostatically induced current transients to reach a steady state with a longer time being required by actively corroding steel. By contrast the potential decay time constants describing galvanostatically or coulostatically induced potential transients decrease with an increase in corrosion rate and values less than 25 s for active specimens and greater than 40 s for passive specimens were determined in this work.
The analysis of potentiostatic transients applied to the corrosion of steel in concrete
Potentiostatically induced current transients obtained on a range of reinforced concrete specimens were analysed to give estimates of the polarisation resistance and interfacial capacitance. The polarisation resistance was compared with the values obtained using more conventional DC methods of analysis and, while it was consistently lower, it was within the error normally attributed to the polarisation resistance method of corrosion rate determination. The interfacial capacitance values determined increased from 0.44 F m-2 for passive steel (polarisation resistance of 132 Ohm m2) to 26.5 F m-2 for active steel (polarisation resistance of 0.34 Ohm m2). This has a dominant effect on the time required for potentiostatically induced current transients to reach a steady state with a longer time being required by actively corroding steel. By contrast the potential decay time constants describing galvanostatically or coulostatically induced potential transients decrease with an increase in corrosion rate and values less than 25 s for active specimens and greater than 40 s for passive specimens were determined in this work.
The analysis of potentiostatic transients applied to the corrosion of steel in concrete
Analyse der potentiostatischen transienten Ströme bei der Stahlkorrosion in Beton
Glass, G.K. (author) / Page, C.L. (author) / Short, N.R. (author) / Zhang, J.Z. (author)
Corrosion Science ; 39 ; 1657-1663
1997
7 Seiten, 2 Bilder, 1 Tabelle, 16 Quellen
Article (Journal)
English
The analysis of potentiostatic transients applied to the corrosion of steel in concrete
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