9) was used to evaluate and simulate the specific parameters (Rs: solution resistance, W Warburgg diffusion impedance, R ct: charge-transfer resistance and C: Faradaic pseudo-capacitance) as presented by the behaviour of our transducer.
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Open image in new window Fig. 5 Nyquist plots for mild steel electrode immersion in 1.0 M HCl solutions without and with various concentrations of antipyrinyl derivatives at 25 ± 1 °C Open image in new window Fig. 6 Equivalent circuit model used to fit the impedance spectra (R s = solution resistance, R ct = charge transfer resistance, and C dl = double-layer capacitance).
R s is the solution resistance, and R ct, the charge transfer resistance is attributed to the corrosion reaction at the electrode/solution interface [33].
In the equivalent circuit used for analyzing impedance plot, R s denotes solution resistance, R ct denotes charge transfer resistance of corroding metal and Q reflects constant phase element of corroding metal solution interface.
R s is the solvent resistance, R f the film resistance, R ct the charge transfer resistance, CPE1 the film capacitance, CPE2 the double layer (the functional and electrolyte layer) capacitance, and W the Warburg diffusion impedance.
A modified Randles [22] equivalent circuit (vide infra) used to fit the experimental impedance data comprised the solution resistance (R s), a constant phase element (Q dl) (used here as a generalized capacitance) in parallel with a resistance R ct (the charge-transfer resistance), and a Warburg element (W, related to a diffusion-controlled process) in series.
