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Study of overall and local electrochemical responses of oxide films grown on CoCr alloy under biological environments

AutorDíaz, Iván; Martínez-Lerma, J. F.; Montoya, R.; Llorente, Irene; Escudero Rincón, María Lorenza; García-Alonso, M. C.
Palabras claveCoCr implant
EIS
LEIS
Hyaluronic acid
CPE distribution
Fecha de publicaciónjun-2017
EditorElsevier
CitaciónBioelectrochemistry 115: 1-10 (2017)
ResumenThe interaction of the physiological medium and living tissues with the implant surfaces in biological environments is regulated by biopotentials that induce changes in the chemical composition, structure and thickness of the oxide film. In this work, oxide films grown on CoCr alloys at 0.5 V vs Ag/AgCl and 0.7 V vs Ag/AgCl have been characterized through overall and localized electrochemical techniques in a phosphate buffer solution and 0.3% hyaluronic acid. Nanopores of 10–50 nm diameter are homogeneously distributed along the surface in the oxide film formed at 0.7 V vs Ag/AgCl. The distribution of the Constant Phase Element studied by local electrochemical impedance spectroscopy showed a three-dimensional (3D) model on the oxide films grown at 0.5 V vs Ag/AgCl and 0.7 V vs Ag/AgCl. This behaviour is especially noticeable in oxide films grown at 0.7 V vs Ag/AgCl, probably due to surface inhomogeneities, and resistive properties generated by the potentiostatic growth of the oxide film.
Versión del editorhttp://dx.doi.org/10.1016/j.bioelechem.2017.01.003
URIhttp://hdl.handle.net/10261/143001
DOI10.1016/j.bioelechem.2017.01.003
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