Evaluation of the microstructural, mechanical and anti‐corrosive properties of a new ternary Ti–15Zr–5Nb alloy in simulated oral environment

The present study explores the microstructural characteristics and electrochemical responses of different TiMoZrTa alloys designed for biomedical implantation. The alloys corrosion resistance (potentiodynamic polarization and electrochemical impedance spectroscopy) was determined in acidified Ringer's solution at 37 °C. The pH was adjusted to 3.6 in order to reproduce the pathological state. The new materials formed spontaneously a passivation oxide film on their surface, and they remained stable for polarizations up to +1.0 VSCE. No evidence of localized breakdown of the oxide layers was registered even when higher positive polarizations than those encountered in the human body were applied.

Section: Introductionmentioning

confidence: 99%

Effect of Ta on the electrochemical behavior of new TiMoZrTa alloys in artificial physiological solution simulating in vitro inflammatory conditions

Bălțatu

Vizureanu

Mareci

et al. 2016

“…Currently, titanium and its alloys are widely used as implant materials for biomedical applications due to their low-specific weight, high-corrosion resistance and superior biocompatibility [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Degradation characteristics of Mg0.8Ca in saline solution with and without albumin protein investigated by electrochemical impedance spectroscopy

Crimu

Bolat

Munteanu

et al. 2014

Biodegradable magnesium-calcium (MgCa) alloy is a very attractive biomaterial. Binary Mg0.8Ca alloy was fabricated. X-ray diffraction (XRD) analysis and optical microscopy observed showed that Mg0.8Ca alloy was composed of a(Mg) phase. The electrochemical impedance spectroscopy (EIS) technique was used for the study on the degradation characteristics of Mg0.8Ca alloy. Because the proteins have a role on the passivation of metals, the effect of albumin protein addition in NaCl solution on the electrochemical behaviour of Mg0.8Ca alloy was studied. It has been shown that in 0.9 wt% NaCl solution the impedance was mainly characterised by one capacitive and one inductive effect, which related to the alloy charge transfer reaction and the relaxation of the absorbed corrosion compounds. The addition of 37.5 mg/mL albumin protein to 0.9 wt% NaCl solution increased the impedance compared to that without albumin protein. The equivalent circuits simulating the electrochemical behaviour of Mg0.8Ca alloy in 0.9 wt% NaCl solution with and without albumin protein were proposed. The surface morphology of the Mg0.8Ca samples after 1-week immersion in Mg0.8Ca alloy in 0.9 wt% NaCl solution with albumin protein was studied using scanning electron microscopy (SEM). The electrochemical mechanism for degradation of Mg0.8Ca alloy in 0.9 wt% NaCl solution is related to the albumin protein addition.

“…Titanium and titanium alloys are employed widely in biomedical applications . The Ti6Al4V alloy is used in biomedical applications because it is mechanically stronger and resists corrosion better than CoCr alloys and stainless steel .…”

Section: Introductionmentioning

confidence: 99%

The estimation of corrosion behavior of thermal oxidized TiNbTaZr alloys for biomedical applications

Mareci

Bolat

Munteanu

et al. 2014

The corrosion behavior of two oxidized TiNbTaZr alloys (Ti25Nb8Ta10Zr and Ti21Nb15Ta6Zr) at 500 and 800 °C for 2‐h in 0.9 wt% NaCl solution are evaluated. Both samples were examined using electrochemical techniques: electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization curves. The electrochemical corrosion parameters obtained from the EIS and potentiodynamic polarization curves indicated a typical passive behavior for untreated and oxidized TiNbTaZr alloys. EIS studies showed high impedance values for both oxidized samples, increasing with exposure time. The polarization results show excellent corrosion resistance for oxidized TiNbTaZr alloys, corroborated by the low corrosion and anodic current density. The oxidation in air at 500 and 800 °C do not exhibit the susceptibility of localized corrosion processes in 0.9 wt% NaCl solution. In addition, scanning electron microscopy (SEM) was employed to observe the surface morphology after polarization test in 0.9 wt% NaCl solution. The oxidized Ti21Nb15Ta6Zr alloy appears to possess superior corrosion resistance than the oxidized Ti25Nb8Ta10Zr alloy in 0.9 wt% NaCl solution.