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Journal of the Electrochemical Society, Vol.162, No.12, D589-D597, 2015
Multilayer Bioactive Coatings Formed on the Vanadium-Free Titanium Alloys via PEO and EPD Processes
In this paper results of the surface modification of the Ti-15Mo, Ti-13Nb-13Zr, Ti-6Al-7Nb alloys by plasma electrolytic oxidation (PEO) coupled by electrophoretic deposition (EPD) technique were presented. On the porous oxide layers hydroxyapatite (HA) particles were deposited, filled cracks and pores of the coatings. The surfaces of the titanium alloys were modified to enhance their corrosion resistance and bioactivity in biological environment. The influence of voltage, time of the BPD process, and bath composition on hydroxyapatite particles deposition on the porous samples were studied. Microstructure, cross-section, phase composition, surface roughness and wettability of the multilayer coatings were determined. Electrochemical investigations shown, that the titanium alloys surfaces modification improved corrosion resistance of the substrates in Ringer solution. Scratch testing shown that the coatings exhibit good adhesion to the substrate. The coatings formed on the titanium alloys surface were bioactive. After simulated body fluid (SBF) immersion, on all of the samples the apatite crystallized and covered the coatings. (C) 2015 The Electrochemical Society. All rights reserved.