Kinetics of the polycrystalline iron electrode in dilute acid and neutral aqueous electrolytes under complex fast potentiodynamic perturbations

Zerbino, J. O.; Vilche, J. R.; Arvía, Alejandro Jorge

doi:10.1007/bf00615174

Cited by 39 publications

(9 citation statements)

References 53 publications

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“…The same applies in the negativepotential-going directions. Furthermore, along the whole potential range (-0.5-0.6 V) the electrochemical reactions behave as reversible processes similar to those encountered for other proton transfer reactions in transition metal hydroxide/oxyhydroxide systems [46][47][48][49]. From thermodynamic data it is con cluded that the inner CoO layer is oxidized to Co3O4 according to…”

Section: The Reversible Characteristics Of the Electrochemical Reactimentioning

confidence: 56%

The electrochemical behaviour of cobalt in alkaline solutions part II. The potentiodynamic response of Co(OH)2 electrodes

Meier

Vilche

Arvía

1982

Journal of Electroanalytical Chemistry and Interfacial Electroc

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The potentiodynamic behaviour of Co(OH)2 hydroxide electrodes is studied in the potential range related to the appearance of Co(III) and Co(IV) species. The corresponding electrochemical reactions involve relatively fast proton transfer processes occurring at potentials close to those predicted from thermodynamics. Sandwich-type structures of the eleclrode/film/solution interface are assumed in the interpretation of the processes. They probably include configurational changes of reactants and products participating in the various electrochemical reactions.

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Section: The Reversible Characteristics Of the Electrochemical Reactimentioning

confidence: 56%

The electrochemical behaviour of cobalt in alkaline solutions part II. The potentiodynamic response of Co(OH)2 electrodes

Meier

Vilche

Arvía

1982

Journal of Electroanalytical Chemistry and Interfacial Electroc

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“…17 The iron oxy-hydroxide layer can also be transformed into a more stable film approaching the Fe3 O4/hydrated Fe z 0 3 structure. 18 The electro-reduction of the iron oxy-hydroxide layer to Fe(OH)2 has been related to peak III while hump IV may involve the electro-reduction of some Fe(II) containing species. In the presence of Na2S203 (<10 -5 M) the E/i displays are qualitatively similar to those described for the plain base solution (Fig.…”

Section: Resultsmentioning

confidence: 99%

A comparative pitting corrosion study of mild steel in different alkaline solutions containing salts with sulphur-containing anions

et al. 1984

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The localized corrosion of mild steel in alkaline solutions containing a salt with a sulphurcontaining anion (sodium sulphate, sodium sulphite, sodium thiosulphate, potassium thiocyanate and sodium sulphide) is studied by using potentiostatic and potentiodynamic techniques complemented with scanning electron microscopy. Alkaline solutions containing one of those salts produce pitting of mild steel at potential values more positive than those of the active-passive transition of iron in base. In the presence of either thiocyanate or thiosulphate anion iron pitting takes place through sulphide formation which reacts at the electrode surface yielding poorly protective ferrous sulphide. At potential more positive than the breakdown potential the kinetic behaviour fits a competitive surface reaction mechanism involving the formation of the passive film and the nucleation and growth of a ferrous sulphide salt layer. The proposed reaction model reproduces the corresponding experimental current-transients.

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“…This technique through the systematic adjustment of the perturbation conditions is in some cases suitable for separating the stages of a complex electrochemical reaction and gaining information about the half life time of reaction intermediates participating in faradaic processes [1][2][3][4]. Most of the data reported in the literature about the application of the TMPS technique refers to the electrosorption of O-and H-adatoms on noble metals in the monolayer range, although it has also been applied to investigating the early stages of the corrosion and passivation of the iron group metals [5] and to the adsorption and electrooxidation of carbon monoxide on polycrystalline platinum [6,7].…”

Section: Introductionmentioning

confidence: 99%

Fast faradaic processes observed during the potentiodynamic polarization of polycrystalline palladium in acid electrolyte

Bolzán

Chialvo

Arvía

1984

Journal of Electroanalytical Chemistry and Interfacial Electroc

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Two almost reversible electrochemical systems are detected during the potentiodynamic anodization of polycrystalline palladium in 1 M H2SO 4 and 1 M HC104 by applying the triangular modulated triangular potential sweep technique. The first electrochemical system which appears in the 0.7-0.9 V range (vs. RHE) corresponds to the reaction Pd + H20 = PdOH + H ÷ + e-whose reversible potential is estimated as 0.80 + 0.02 V and the average half-life time of PdOH species is estimated as 6 X 10-3 s. The second electrochemical system appears when the anodizing potential sweep extends to the oxygen evolution potential region. The appearance of the second electrochemical system is accompanied by a change in colour of the electrode surface, a shift of the current potential curve of the oxygen evolution reaction and an increase in thickness of the oxide anodic layer, The reversible response is tentatively assigned to the PdO2/PdO 3 redox couple.

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Kinetics of the polycrystalline iron electrode in dilute acid and neutral aqueous electrolytes under complex fast potentiodynamic perturbations

Cited by 39 publications

References 53 publications

The electrochemical behaviour of cobalt in alkaline solutions part II. The potentiodynamic response of Co(OH)2 electrodes

The electrochemical behaviour of cobalt in alkaline solutions part II. The potentiodynamic response of Co(OH)2 electrodes

A comparative pitting corrosion study of mild steel in different alkaline solutions containing salts with sulphur-containing anions

Fast faradaic processes observed during the potentiodynamic polarization of polycrystalline palladium in acid electrolyte

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