Influence of hydroxyapatite on the corrosion resistance of the Ti-13Nb-13Zr alloy |
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Authors: | Laís T Duarte Sonia R Biaggio Romeu C Rocha-Filho Nerilso Bocchi |
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Affiliation: | 1. Departamento de Química, Universidade Federal de S?o Carlos, C.P. 676, 13560-970, Sao Carlos, SP, Brazil
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Abstract: | Electrochemical analyses on the biocompatible alloy Ti-13Nb-13Zr wt% in an electrolyte simulating physiological medium (PBS
solution) are reported. Hydroxyapatite (HA) films were obtained on the alloy by electrodeposition at constant cathodic current.
Samples of the alloy covered with an anodic-oxide film or an anodic-oxide/HA film were analyzed by open circuit potential
and electrochemical impedance spectroscopy measurements during 180 days in the PBS electrolyte. Analyses of the open-circuit
potential (E
oc) values indicated that the oxide/HA film presents better protection characteristics than the oxide only. This behavior was
corroborated by the higher film resistances obtained from impedance data, indicating that, besides improving the alloy osteointegration,
the hydroxyapatite film may also increase the corrosion protection of the biomaterial. |
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Keywords: | |
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