Abstract
The potentiodynamic response of the polycrystalline Fe electrode in aqueous electrolytes containing K2SO4 (2⩽pH⩽7) under fast perturbation conditions is investigated. When the conditions are properly adjusted, film-forming species and an oxide phase are detected. The results obtained by the application of the triangularly modulated triangular potential sweep (TMTPS) technique show the degree of reversibility of the various anodic and cathodic processes related to the electrodissolution of iron. The experimental response can be interpreted through a complex reaction model involving electrochemical reactions and ageing processes. The model contains, as particular cases, most of the mechanisms proposed earlier for the dissolution of iron in aqueous solution. The electrochemical interface is conceived as dynamic, deprotonation and dehydration processes playing an important role during the Fe electro-oxidation.
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