Electrical Double Layer Capacities of Iron During Forced Cathodic Decay of Passivity
- 1 January 1962
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 109 (11) , 1096-1099
- https://doi.org/10.1149/1.2425245
Abstract
A study of the behavior of the differential capacity of the electrical double layer of high‐purity, zone‐refined iron in , pH 2.3–6.5 has been made during forced cathodic decay of passivity using a fast single pulse technique. The capacity‐time curve shows a maximum >22 µf/cm2 (but 2) at the end of the Flade plateau. This is explained on the basis of a desorption step of an as yet undefined charged particle. The capacity at O2 evolution potentials is 6–8 µf/cm2, compatible with an oxide film; at H2 evolution potentials it is 19 µf/cm2, independent of pH in both cases. The charge involved in the Flade plateau is 550–850 µcoul/cm2 with an average 680 µcoul/cm2.Keywords
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