Abstract
The corrosion resistance of titanium alloy, Ti–6Al–7Nb, was investigated through electrochemical impedance spectroscopy (EIS), open circuit potential (OCP) measurements and scanning electron microscopy (SEM) and Energy Dispersive X-ray (EDX) analysis. The tests were done in Hank's solution at 37 o C for immersion periods expanded to 169 h. A high corrosion resistance was obtained for Ti–6Al–7Nb alloy in hank's solution due to the stable passive film formed on its surface. The EIS results indicated the presence of a single passive layer immediately after immersion. However, after 24 h of immersion in hank's solution, the EIS exhibited the presence of a bi-layered surface corresponding to an inner layer and an outer layer. Further, the film formed on the alloy after 169 h was confirmed by SEM and EDX analysis as calcium and phosphate may be due to apatite formation.
Highlights
Titanium alloys are today one of the most important metallic materials used in orthopedics and dental surgery
We investigated the electrochemical behavior of the oxide film formed on the Ti–6Al–7Nb alloy in Hank’s physiological solution, using open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PD) measurements [25]
We investigate the corrosion resistance of Tialloy, Ti-6Al-7Nb in Hank’s naturally aerated solution at 37 ◦C for one weak (169 h) using electrochemical impedance spectroscopy, open circuit potential measurements, scanning electrocn microscopy (SEM) and Energy Dispersive X-ray (EDX) analysis
Summary
Titanium alloys are today one of the most important metallic materials used in orthopedics and dental surgery. The composition and thickness of the formed oxide determine the corrosion resistance of biometallic materials and release of metal ions from the implant that can affect health [9,10,11]. The passive film on Ti implants is mainly composed of TiO2, existing in a rutile-type tetragonal structure [8] The presence of this thermodynamically stable and adherent oxide contributes to high corrosion resistance [12]. It has been reported that vanadium oxide formed on the surface of Ti–6Al–4V alloy dissolves, and this dissolution is further enhanced by the presence of Cl- ions in Hank’s solution [13]. We investigated the electrochemical behavior of the oxide film formed on the Ti–6Al–7Nb alloy in Hank’s physiological solution, using open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PD) measurements [25]. Hank’s physiological solution was prepared according to previous studies [28,42,45,46,47,48] (8 g/l NaCl, 0.4 g/l KCl, 0.35 g/l NaHCO3, 0.25 g/l NaH2PO4 ×H2O, 0.06 g/l Na2HPO4 ×2H2O, 0.19 g/l CaCl2.×2H2O, 0.19 g/l MgCl2, 0.06 g/l MgSO4 ×7H2O and 1.0 g/l glucose, pH 7.8) using doubly distilled water
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