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Título:
Characterization of TiO2 films made by anodic oxidation on Ti-6Al-4V alloy
Autor/es:
M.L. VERA; A.E. ARES; M.R. ROSENBERGER; D.G. LAMAS; C.E. SCHVEZOV
Lugar:
Campinas. Sao Paulo.
Reunión:
Otro; 20ª REUNIÃO ANUAL DE USUÁRIOS DO LABORATÓRIO NACIONAL DE LUZ SÍNCROTRON (LNLS); 2010
Institución organizadora:
LNLS
Resumen:
The Ti-6Al-4V alloy is widely used as a
structural material due to its excellent mechanical and corrosion resistant
properties. At present they are also used in mechanical prosthetic devices for
human implants due to the excellent biocompatibility. The bio and chemical
properties of titanium alloys are known to be associated to the formation of
TiO2 on the surface which occurs naturally. Oxide films in metals can also be
produced by anodic oxidation, resulting in films which may be thicker and
denser than the natural oxides. In this work TiO2 films on Ti-6Al-4V substrates
were produced by anodic oxidation, using a H2SO4 1 M solution as electrolyte at
different voltages (from 10V to 70V). Thickness and phase composition of the
films were determined by X-ray reflectometry and X-ray diffraction,
respectively. These experiments were carried out at the D12A-XRD1 beamline of
the LNLS (Research proposal D10A - XRD2-8100). The results of the influence of
voltage on color, thickness, morphology and crystalline structure of the oxides
are presented which are necessary to analyze for the production of coatings for
biomedical applications. TiO2 films of different colors were obtained, with
thickness ranging from 20 to 200nm depending on the applied voltage.
Relationships among voltage, color and thickness were confirmed. The film
roughness is of the order of the substrate roughness and it increases with the
applied voltage. The oxide layers produced at low voltages up to 50V are smooth
and amorphous. A spark discharge occurs, at voltages larger than 60V, producing
porous and crystalline (anatase and rutile) coatings. Each of these
morphologies and structures of the coatings are suitable to different
biomedical applications and devices.