Duarte Laís T, Biaggio Sonia R, Rocha-Filho Romeu C, Bocchi Nerilso
Departamento de Química, Universidade Federal de São Carlos, Sao Carlos, SP, Brazil.
J Mater Sci Mater Med. 2009 May;20(5):1009-15. doi: 10.1007/s10856-008-3662-4. Epub 2008 Dec 13.
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.
报道了在模拟生理介质（PBS溶液）的电解液中对生物相容性合金Ti-13Nb-13Zr wt%进行的电化学分析。通过恒阴极电流电沉积在合金上获得了羟基磷灰石（HA）薄膜。在PBS电解液中，对覆盖有阳极氧化膜或阳极氧化/HA膜的合金样品进行了180天的开路电位和电化学阻抗谱测量。开路电位（E(oc)）值分析表明，氧化物/HA膜比仅氧化物具有更好的保护特性。阻抗数据得到的较高膜电阻证实了这种行为，表明除了改善合金的骨整合外，羟基磷灰石膜还可能增加生物材料的耐腐蚀性能。
