Srinivasan, R. and Venkatachari, G. and Renganathan, N.G. and Balakrishnan, K.
(1986)
Monitoring of reinforcement corrosion by impedance technique.
Bulletin of Electrochemistry , 2 (2).
pp. 99-101.
ISSN 0256-1654
Abstract
Monitoring of reinforcement corrosion by d.c. polarisation technique is found to be unreliable due to high
resistance of concrete. In this aspect, a.c. impedance method is found to be useful since the resistance of
concrete is eliminated in the measurements. The impedance of the steel embedded in concrete with and
wlthout chloride has been measured for the frequency range of I mHz to 10 kHz at the corrosion potential
using the frequency response analyser. It has been found that the impedance behaviour of steel in
concrete without chloride is of pure capacitive nature due to passivation of steel by the concrete. But in
the case of steel in concrete containing 496chloride the impedance diagram is found to be a distorted
semicircle owing to the corrosion of steel. From the impedance values, it is possible to monitor the
corrosion of reinforcemat by periodic measurements.
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