Abstract
The aim of the present work was to investigate electrochemical behavior of the Ti6Al7Nb alloy in the simulated body fluid (SBF) containing Ca2+, HCO3 −, and HPO4 2− ions. At first, optimal conditions necessary for oxide nanotube formation were determined. The experiments were conducted in the 1 M (NH4)2SO4 with 0.5 wt% NH4F electrolyte at room temperature. Anodization of the alloy samples was carried out under variable external voltage U in the range from 10 to 40 V at room temperature. Obtained surface morphology was examined by SEM and X-ray techniques. Nanotube diameter was calculated and correlated with the imposed voltage. Having control over the size of nanotubes, samples with the obtained nanostructures of a chosen diameter were immersed into SBF solution with pH = 7.4 for a fixed period of time. Then, they were removed from the fluid and subjected to the electrochemical investigation. Corrosion current and corrosion potential were determined, and it was found that the best anticorrosion properties were obtained for heat-treated nanotube layer: i corr = 39 nA/cm2 and E corr = −0.236 V vs Ag/AgCl. Finally, the interaction between the oxide surface and the solution was studied using polarization and electrochemical impedance spectroscopy (EIS) techniques.
Highlights
Due to aging of our society, there is an increased need for implant manufacturing, and various materials like stainless steels, CoCr alloys, and recently, titanium (Ti)based alloys have been tested as biomaterials in orthopedic and dental applications [1]
Corrosion resistance study conducted by polarization and electrochemical impedance spectroscopy (EIS) measurements gave similar results
Electrochemical measurements were performed on the samples anodized at constant voltage of 30 V
Summary
Due to aging of our society, there is an increased need for implant manufacturing, and various materials like stainless steels, CoCr alloys, and recently, titanium (Ti)based alloys have been tested as biomaterials in orthopedic and dental applications [1]. Since these materials must be biocompatible, i.e., non-toxic and they should not cause any inflammatory or allergic reactions [2], titanium alloys seem to be the best candidate for the majority of these applications. Titanium itself has high bulk modulus (∼100 GPa) which makes this metal not compatible with mechanical properties of the bones. The possibility of adjusting mechanical properties by varying alloy composition raised the question of their electrochemical behavior, since it may not be obvious whether passive layer of TiO2 formed on the Ti surface remains unchanged after alloying
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