Measurements of the complex impedance of the interface
between mild steel and deaerated 1 M HCl
solutions without and with the addition of different inhibitors,
derivatives of benzimidazole, have been
made in the frequency range of (0.1−9.5) × 104 Hz.
Adequate structure models of the interfaces as well
as some data on the kinetics of the partial processes are offered.
It is found that the double-layer capacity
as well as the adsorption capacity can not be presented by a frequency
independent lumped element. The
experimental data show a frequency distribution and therefore a
modeling element with frequency dispersion
behavior; a constant phase element has been used. At high
inhibitor concentrations a second time constant
is clearly observed in the impedance spectra. It is most probably
connected with the adsorption process.
Two time constants determined by the charge transfer and the
adsorption of the inhibitor, respectively,
can be readily outlined.
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