title: Study of overall and local electrochemical responses of oxide films grown on CoCr alloy under biological environments.
abstract: The 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 10-50nm 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.
authors.affiliation: Centro Nacional de Investigaciones Metalúrgicas (CENIM), Consejo Superior de Investigaciones Científicas (CSIC), Avenida Gregorio del Amo, 8, Madrid, Spain.
authors.forename: I
authors.initials: I
authors.lastname: Diaz
authors.affiliation: Facultad de Ciencias Químicas, Universidad Autónoma de San Luís Potosí, S.L.P. Av. Dr. Manuel Nava No. 6, Zona Universitaria, C.P. 78210 San Luis Potosí, S.L.P., Mexico.
authors.forename: J F
authors.initials: JF
authors.lastname: Martinez-Lerma
authors.affiliation: Centro Nacional de Investigaciones Metalúrgicas (CENIM), Consejo Superior de Investigaciones Científicas (CSIC), Avenida Gregorio del Amo, 8, Madrid, Spain; Research Group Electrochemical and Surface Engineering, Vrije Universiteit Brussel, Campus Etterbeek Pleinlaan 2, 1050 Brussels, Belgium.
authors.forename: R
authors.initials: R
authors.lastname: Montoya
authors.affiliation: Centro Nacional de Investigaciones Metalúrgicas (CENIM), Consejo Superior de Investigaciones Científicas (CSIC), Avenida Gregorio del Amo, 8, Madrid, Spain.
authors.forename: I
authors.initials: I
authors.lastname: Llorente
authors.affiliation: Centro Nacional de Investigaciones Metalúrgicas (CENIM), Consejo Superior de Investigaciones Científicas (CSIC), Avenida Gregorio del Amo, 8, Madrid, Spain.
authors.forename: M L
authors.initials: ML
authors.lastname: Escudero
authors.affiliation: Centro Nacional de Investigaciones Metalúrgicas (CENIM), Consejo Superior de Investigaciones Científicas (CSIC), Avenida Gregorio del Amo, 8, Madrid, Spain. Electronic address: crisga@cenim.csic.es.
authors.forename: M C
authors.initials: MC
authors.lastname: García-Alonso
mesh_terms: D000497:Alloys / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry; D002858:Chromium Alloys / Q000737:chemistry; D003035:Cobalt / Q000737:chemistry; D003343:Corrosion; D058266:Dielectric Spectroscopy; D004563:Electrochemistry / Q000379:methods*; D006820:Hyaluronic Acid / Q000737:chemistry; D008422:Materials Testing / Q000379:methods; D008855:Microscopy, Electron, Scanning; D010087:Oxides / Q000737:chemistry; D019736:Prostheses and Implants; D018030:Silver Compounds / Q000737:chemistry; D012996:Solutions / Q000737:chemistry; D013499:Surface Properties
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D002858:Chromium Alloys; D010087:Oxides; D018030:Silver Compounds; D012996:Solutions; D003035:Cobalt; D006820:Hyaluronic Acid; C037548:silver chloride
keywords: CPE distribution; CoCr implant; EIS; Hyaluronic acid; LEIS