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Print version ISSN 0100-4670On-line version ISSN 1678-4618
CAPELA, J. M. V.; CAPELA, M. V. and MAGNANI, R.. Generalization of a linear model of electrochemical impedance. Eclet. Quím. [online]. 2003, vol.28, n.1, pp.63-67. ISSN 0100-4670. http://dx.doi.org/10.1590/S0100-46702003000100008.
The function of impedance for processes of simple electrode is generally deduced from the Randles equivalent electric circuit. In this work the generalization of this function was studied, by the introduction of a parameter related to the flexibility of its phase angle and magnitude. The function was fitted to the impedance experimental measures from the Ti-10wt.%Al alloy in sodium chloride solution 0.9% and varying the amplitude of perturbation. The results showed that the generalized function reduces the distortions between the experimental and the theoretical curve with the best results obtained for signals with amplitude of 10 mV.
Keywords : Electrochemical impedance; Linear systems; Non linear regression; Titanium alloys.