TY - GEN
T1 - Hydration and structural transformations during titanium anodization under alkaline conditions
AU - Acevedo-Peña, P.
AU - Vázquez-Arenas, J.
AU - Cabrera-Sierra, R.
AU - Lartundo-Rojas, L.
AU - González, I.
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84885707553&partnerID=8YFLogxK
U2 - 10.1149/05031.0021ecst
DO - 10.1149/05031.0021ecst
M3 - Contribución a la conferencia
AN - SCOPUS:84885707553
SN - 9781607684190
T3 - ECS Transactions
SP - 21
EP - 32
BT - Corrosion, Passivity, and Energy
PB - Electrochemical Society Inc.
T2 - Corrosion, Passivity, and Energy: A Symposium in Honor of Digby D. Macdonald - PRiME 2012
Y2 - 7 October 2012 through 12 October 2012
ER -