Abstract

REYES JAIMES, L. J et al. Degradation Assessment of Fluorapatite Surfaces Using Electrochemical Techniques. Ciencia en Desarrollo [online]. 2015, vol.6, n.1, pp.33-39. ISSN 0121-7488.

The pH effect of a Simulated Body Fluid in the apatite formation and the degradation of the Ti6Al4V alloy surfaces, coated by calcium phosphate obtained through cathodic electrodeposition was evaluated. The simulated body fluid pH and the coating immersion time were taken as variables. The formation of apatite was corroborated by Scanning Electron Microscopy, Energy Dispersive Spectroscopy, X Ray Diffraction and Atomic Absorption Techniques. The coating degradation was assessed by the Electrochemical Impedance Spectroscopy and the Potential Dynamic Polarization Curves. The results have shown that the coatings had high concentrations of fluorapatite (Ca₅(PO₄)₃F) and its formation was favored as the simulated body fluid pH and the immersion time increases. Moreover, it was found that the coatings samples evaluated at pH 7.2 were less thermodynamically steady; however, the evaluated coating at pH 7.6 exhibited a more active surface, so that a higher rate of degradation is obtained.

Keywords : Degradation; Cathodic Electrodeposition; Fluorapatite; pH; SBF; Ti6Al4V.

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