INVESTIGADORES
CERE silvia
artículos
Título:
Chemical and mechanical properties of anodized cp-titanium in NH4 H2PO4/NH4F media for biomedical applications
Autor/es:
LUCAS ALOIA GAMES; A. GOMEZ SANCHEZ; EMILIO JIMENEZ-PIQUÉ; WIDO SCHREINER; SILVIA CERE; JOSEFINA BALLARRE
Revista:
SURFACE AND COATINGS TECHNOLOGY
Editorial:
ELSEVIER SCIENCE SA
Referencias:
Lugar: Amsterdam; Año: 2012
ISSN:
0257-8972
Resumen:
Potentiostatic anodizing of commercially pure titanium, using ammonium phosphate and
ammonium fluoride solution as electrolyte is studied. The objective is to generate titanium
oxides on the surface and phosphor compounds presenting good protective and mechanical
properties, and proper adhesion to the metal substrate to remain during surgical orthopedic
procedures (implants). Two different applied potentials were used to obtain different
surface oxides morphologies (20 and 30V). The characterization and quantification of the
generated deposits is presented as a starting point for the future application of these
composite types of materials. X-ray Photoelectron Spectroscopy (XPS) and Raman
spectroscopy techniques showed the presence of phosphor compounds and anatase (TiO2)
as the main constitutive phases.
Anodized samples presented less passivity current density with respect to the bare
substrate, showing that the film formed by anodizing acts as an effective barrier to the
electrolyte entrance to reach the metallic surface. Besides, mechanical properties of bare
substrate were improved with the formation of anodic films: hardness value was increased
in the oxide zones and the Youngs elastic modulus was decreased in the phosphorcompounds
zones in the sample anodized with 30V, generating an interface with different
elastic properties that could be able to enhance the prosthesis performance. Nano-scratch
tests showed a very ductile behavior and good adhesion of anodic films, without any apparent signs of cracks or delamination.