Structural characterization and electrochemical behavior of 45S5 bioglass coating on Ti6Al4V alloy for dental applications

In the present work, 45S5 bioglass coatings were deposited on the Ti6Al4V alloy substrate through the cathodic colloidal electrophoretic deposition process (CEDP) proposed in this work. The coatings were thermally treated at temperatures of 500, 600, 700, and 800 degrees C for 2 h, and their structure was characterized by FESEM and DRX. Nanostructure and phase evolution of the coatings and xerogels was followed as a function of temperature. The corrosion resistance of the Ti6Al4V alloy and the 45S5/Ti6Al4 V coating was studied by means of Tafel extrapolation in Hank's solution, at 37 degrees C, simulating the conditions inside the mouth. The 45S5 bioglass coatings displayed an amorphous nanostructure at lower temperatures, and partial crystallization at higher temperatures. An increase in the corrosion resistance was observed in the 45S5/Ti6l4V coating treated at 700 degrees C because it reduced the i(corr), and there was a change in the E-corr towards more noble values. A model of the chemical anchorage of the 45S5 bioglass coating on Ti6Al4V was proposed. (C) 2016 Published by Elsevier B.V.