In vitro Corrosion Study by Electrochemical and Surface Analysis Techniques of the Hydroxyapatite Sol-Gel Deposition on Commercially Pure Titanium

摘要

Developments in the field of surgical implant materials are in progress which involves covering the metal implants with a layer, which may limit the leakage of metal ions and permitting a natural bonding to living tissues. The aim of this work is the production and characterization of sol-gel coatings for protection and bioactivation of metals used as standard surgical implant materials, such as commercially pure titanium (Cp-Ti). These films should both prevent degradation of the substrates by corrosion for inducing the formation of a hydroxyapatite (HA) rich layer onto the material surface. Formation of HA layers can be observed by soaking the material in phospho-calcium gel using scanning electron microscopy (SEM). Fourier transform infrared spectroscopy (FTIR) analysis was performed in order to emphasize the formation of the hydroxyapatite layer onto the Cp-Ti surface. The performance of the coated metal was evaluated in vitro by electrochemical impedance spectroscopy (EIS).