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A kinetic interpretation of a negative time constant in impedance equivalent circuits for the dissolution/passive transition |
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| Authors: | Joan Gregori, Jos Juan Garcí a-Jare o, Michel Keddam,Francisco Vicente |
| Affiliation: | aDepartment of Physical Chemistry, University of València, C/Dr. Moliner 50, 46100 Burjassot, Spain bFundació General, University of València, C/Dr. Moliner 50, 46100 Burjassot, Spain cUPR 15 of CNRS “Laboratoire Interfaces et Systèmes Electrochimiques, Université P&M Curie, C.P. 133, 4 Place Jussieu, 75252 Paris Cedex 05, France |
| Abstract: | A theoretical impedance function is proposed for the active/passive transition of nickel in an acid sulphate medium. It is considered that passivating species progressively covers the electrode surface. This approximated model predicts the appearance of negative time constants in the impedance spectra when coverage coefficient θ values for passive species are greater than 0.5. |
| Keywords: | Negative resistance Electrochemical impedance Active/passive transition Anion competence Anodic dissolution |
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