Authors: Montero-Ocampo, C.; Villegas, D.; Veleva, L.

Source: Surface Engineering, Volume 24, Number 1, January 2008 , pp. 18-22(5)

Publisher: Maney Publishing

Abstract:

Calcium phosphate (CP) coatings on Ti6Al4V alloy were grown at controlled current densities (from 3 to 10 mA cm⁻²) during electrochemical deposition (ECD). The thickness, structure and composition of the coatings were investigated by X-ray diffraction (XRD), infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The results showed that the thickness (ranging from 3 to 16 μm) shows a parabolic increase with the applied deposition current density. The hexagonal hydroxyapatite (HA) structure was the main phase at the current density of 10 mA cm⁻² during ECD. The potential–time curves showed that the CP deposition progresses due to the initial reduction of alloy surface oxide layer, after which a reduction of nitrate ions takes place on the active free surface sites. The kinetics of this process is enhanced by sufficiently high current densities. Such current densities have a direct influence on the local pH of the solution and determine the morphology, structure and composition of ECD products.

Keywords: ELECTROCHEMICAL DEPOSITION; HYDROXYAPATITE; CALCIUM PHOSPHATE COATINGS; TI6AL4V ALLOY

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174329407X232574

Publication date: 2008-01-01

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