On the faradaic impedance of the electrochemical dissolution of nickel
DOI:
https://doi.org/10.3989/revmetalm.2005.v41.iExtra.1037Keywords:
EIS, Equivalent circuit, Nickel, Double layer capacity, Charge transfer resistanceAbstract
Consecutive impedance spectra for nickel electrodes in acid medium have been obtained. The first recorded spectrum is fitted to an equivalent circuit with three time constants, if one consider a partially or completely passivated electrode. The second registered spectrum is characteristic to a corrosion kinetic controlled by the transport across a finite layer thickness. The microscopic images show an increase in the irregularity of the electrode surface after the second spectrum is registered. Also, the double layer capacity is considerably increased.
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