Hydration and structural transformations during titanium anodization under alkaline conditions

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Resumen

Ti anodic films were potentiostatically grown in 0.1 M NaOH aqueous solutions, in a potential range in which the voltammetric characterization showed an anodic shoulder related to the oxidation of TixO y (with y/x < 2) oxides. A variation in the density of donors and the flat band potential obtained by EIS measurements was related to changes in Ti suboxides proportion, confirmed by ARXPS measurements. A modified Point Defect Model (PDM) was fitted to EIS experimental data in order to estimate the kinetic parameters describing the passivity of the Ti films. The model accounts for the formation and diffusion of oxygen and hydroxyl vacancies during film growth. The kinetic parameters related to film dehydration (e.g. hydroxyl vacancies) decrease as the formation potential becomes more positive, suggesting that the film hydration is crucial in the structure of the oxide grown during Ti anodization.

Idioma originalInglés
Título de la publicación alojadaCorrosion, Passivity, and Energy
Subtítulo de la publicación alojadaA Symposium in Honor of Digby D. Macdonald
EditorialElectrochemical Society Inc.
Páginas21-32
Número de páginas12
Edición31
ISBN (versión impresa)9781607684190
DOI
EstadoPublicada - 2013
EventoCorrosion, Passivity, and Energy: A Symposium in Honor of Digby D. Macdonald - PRiME 2012 - Honolulu, HI, Estados Unidos
Duración: 7 oct. 201212 oct. 2012

Serie de la publicación

NombreECS Transactions
Número31
Volumen50
ISSN (versión impresa)1938-5862
ISSN (versión digital)1938-6737

Conferencia

ConferenciaCorrosion, Passivity, and Energy: A Symposium in Honor of Digby D. Macdonald - PRiME 2012
País/TerritorioEstados Unidos
CiudadHonolulu, HI
Período7/10/1212/10/12

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