EIS, Mott Schottky and EFM analysis of the electrochemical stability and dielectric properties of Ca-P-Ag and Ca-P-Si-Ag coatings obtained by plasma electrolytic oxidation in Ti6Al4V
Keywords:plasma electrolytic oxidation, electrochemical analysis, Ti6Al4V, coating, EFM
Ti6Al4V ELI (ASTM F136) alloy is one of the most used alloys in devices forosteosynthesis and joint replacement. However, the properties of this alloy can be improvedregarding biocompatibility and the osteointegration with the bone tissue through coatings.The aim of this study was the evaluation of the electrochemical behavior of a coating obtainedby plasma electrolytic oxidation on Ti6Al4V ELI, using electrolyte solutions enriched withPO42-, Ca+2, Si+4 ions and various concentrations of Ag+1. The coatings were characterized byelectrochemical impedance spectroscopy (EIS) and Mott-Schottky (M-S) in a three-electrodecell with a simulated physiological solution. The electrochemical behavior was comparedwith electrostatic force microscopy (EFM). The EIS results showed improved stabilityproperties in corrosion for Ca-P-Ag coatings, compared with Ca-P-Si-Ag. Nyquist and BodeSpectra showed relaxations related to charge transference to the double electrochemicallayer and the reflex of the microstructural changes and conductivity of the coating given byits composition. According to with M-S results, all the samples showed an n-type conductivityincreased with silver inclusion. The potential, the phase, and amplitude of the coatings withsilver inclusion compared to uncoated Ti6Al4V were observed by EFM.
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