Interpretação de curvas de polarização

Abstract:

The experimental polarization curves, both qualitatively and quantitatively, are typically interpreted considering that these are under activation polarization and, in the case of reduction reaction of oxygen, under concentration polarization. However, the experimental polarization curves are nearly always subjected to other forms of polarization such as resistance polarization (ohmic drop) or other phenomena such as blocking of the working electrode surface with gas bubbles or with polar organic molecules or even with corrosion products. Moreover, there are changes of the electrolyte characteristics as a result of reactions that occur during the polarization as well as changes of the conditions adopted for carrying out the scan. All of the above mentioned points determine significant changes in the polarization curves. For this reason , the interpretation of polarizations curves must take into account all possible variables which must be interpreted together with observations of the test cell, the surface of the working electrodes and, whenever possible, with the knowledge of the system behavior. This paper presents and discusses some experimental polarization curves pointing out and analyzing the detected deviations

Reference:
PANOSSIAN, Zehbour; SANTOS, Célia Aparecida Lino dos; CARDOSO, Juliana Lopes; SILVA, André Luiz Nunis da; CAMARGO, Rafael Augusto. Interpretação de curvas de polarização. In: CONGRESSO INTERNACIONAL DE CORROSÃO, INTERCORR, 2014, Fortaleza. Proceedings.. Rio de Janeiro: ABRACO, 2014. 28 p.

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