INVESTIGADORES
SCHVEZOV Carlos Enrique
artículos
Título:
Corrosion resistance of titanium dioxide anodic coatings on Ti?6Al?4V
Autor/es:
VERA, M. L; LINARDI, E.; LANZANI, L.; C.M. MENDEZ; SCHVEZOV, CARLOS E; ARES, ALICIA ESTHER
Revista:
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
Editorial:
WILEY-V C H VERLAG GMBH
Referencias:
Lugar: Weinheim; Año: 2014
ISSN:
0947-5117
Resumen:
The Ti?6Al?4V alloy is used for biomedical implants due to its corrosion
resistance and biocompatibility, associated with the spontaneous formation of
TiO2 oxide. However, the native film may be flawed and after some time of
implantation in the body it may release metal ions. Oxides of higher thickness
than naturally grown can be produced by anodic oxidation.
The objective of this study was to evaluate the corrosion resistance of anodic
TiO2 coatings, evaluating the influence of the thickness and crystalline structure
of the coatings. Amorphous coatings were obtained from 27 to 140nm that
crystallized in anatase and rutile phases by heat treatment. The corrosion
resistance was evaluated by potentiodynamic measurements in 0.9% sodium
chloride, which is the main component of physiological solution.
Evaluation of the electrochemical parameters showed that anodic coatings are
more efficient barrier than the natural TiO2 oxide.
As the oxidation processes influenced the electrochemical properties of metals
by altering the resistance to corrosion, therefore they become important to
study the electrochemical behavior of the oxides by electrochemical impedance
spectroscopy.