Electrochemical characterization of ZrTi alloys for biomedical applications. Part 2: The effect of thermal oxidation

Cimpoeşu

et al. 2016

The electrochemical behavior of Zr5Ti, Zr25Ti, and Zr45Ti alloys with surface modification was monitored in phosphate-buffered saline (PBS) solution, at the normal pH of the internal medium specific to healthy state (pH ¼ 7.3), and hydrogen peroxide added to PBS solution in order to simulate the inflammatory state, with a more acid medium (pH ¼ 4.9). A passive behavior for thermally oxidized ZrTi alloys was registered using linear potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Very low passive current densities were obtained from the anodic polarization curve, showing a passive behavior for all ZrTi alloys. The EIS data for all three alloy compositions were recorded for both pH solutions after 1 day, and 7 days immersion. From EIS data, an equivalent circuit (EC) for two time constants was modeled. The results showed that the Zr45Ti alloys with surface modification may be considered as potential candidates for biomedical applications based on their corrosion resistance in PBS solutions.

Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Influence of hydrogen peroxide on the corrosion of thermally oxidized ZrTi alloys in phosphate‐buffered saline solution

Trincă

Cimpoeşu

et al. 2016

“…Transition metal/oxide interfaces have been attracted because they are used in many applications . Thus, surface modification of ZrTi alloys can provide a route to obtain new metal/oxide interfaces with sufficient chemical stability for use in biomedical applications . Thermal oxidation at elevated temperature of metals and alloys leads to the rapid formation of oxide films on their surfaces with high corrosion resistance .…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal oxidation on electrochemical corrosion behaviour of ZrTi alloys for dental applications

Bolat

Istrate

et al. 2015

Electrochemical behaviour of Zr5Ti, Zr25Ti and Zr45Ti, with and without surface modification were investigated for dental applications. All untreated and thermal oxidized alloys in Na2CO3 at 890 °C were tested by electrochemical impedance spectroscopy (EIS) performed in 10% carbamide peroxide solution. In addition, scanning electron microscopy (SEM) was employed to observe the surface morphology before and after 8 hours immersion time in carbamide peroxide solution. The electrochemical corrosion parameters obtained from the EIS indicated a typical passive behaviour for untreated and thermal oxidized ZrTi alloys. Higher impedance values were observed for thermal oxidized ZrTi alloys compared to untreated materials. The thermal oxidized Zr45Ti alloy appears to possess superior corrosion resistance than the thermal oxidized Zr25Ti and Zr5Ti alloys in carbamide peroxide solution.

“…Surface modification treatments can improve the passivation characteristics of oxide layers on titanium and titanium alloys. In particular, thermal oxidation technique is a widely used surface engineering process to improve the anti‐corrosion and anti‐wear properties of titanium and titanium alloys , based on thermochemical reaction.…”

Section: Introductionmentioning

confidence: 99%

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

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.