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. 2022 Dec 9;15(24):8812.
doi: 10.3390/ma15248812.

Influence of Tantalum Addition on the Corrosion Passivation of Titanium-Zirconium Alloy in Simulated Body Fluid

El-Sayed M Sherif  1 , Yassir A Bahri  2 , Hamad F Alharbi  2 , Muhammad Farzik Ijaz  2 , Ibrahim A Alnaser  1   2
Affiliations

Influence of Tantalum Addition on the Corrosion Passivation of Titanium-Zirconium Alloy in Simulated Body Fluid

El-Sayed M Sherif et al. Materials (Basel). .

Abstract

Ti-15%Zr alloy and Ti-15%Zr-2%Ta alloy were fabricated to be used in biomedical applications. The corrosion of these two alloys after being immersed in simulated body fluid for 1 h and 72 h was investigated. Different electrochemical methods, including polarization, impedance, and chronoamperometric current with time at 400 mV were employed. Also, the surface morphology and the compositions of its formed film were reported by the use of scanning electron microscope and energy dispersive X-ray. Based on the collected results, the presence of 2%Ta in the Ti-Zr alloy passivated its corrosion by minimizing its corrosion rate. The polarization curves revealed that adding Ta within the alloy increases the corrosion resistance as was confirmed by the impedance spectroscopy and current time data. The change of current versus time proved that the addition of Ta reduces the absolute current even at high anodic potential, 400 mV. The results of both electrochemical and spectroscopic methods indicated that pitting corrosion does not occur for both Ti-Zr and Ti-Zr-Ta alloys, even after their immersion in SBF solutions for 72 h.

Keywords: Ta addition; Ti-base alloys; corrosion passivation; electrochemical techniques; simulated body fluid; spectroscopic analysis.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
PCP curves of (a) Ti-Zr alloy and (b) Ti-Zr-Ta alloy immersed in SBF for 1.0 h.
Figure 2
Figure 2
PCP curves of (a) Ti-Zr alloy and (b) Ti-Zr-Ta alloy immersed in SBF for 72 h.
Figure 3
Figure 3
Nyquist plots for (a) Ti-Zr alloy and (b) Ti-Zr-Ta alloy after their immersion in SBF solution for 1.0 h.
Figure 4
Figure 4
Nyquist plots for (a) Ti-Zr alloy and (b) Ti-Zr-Ta alloy after their immersion in SBF solution for 72 h.
Figure 5
Figure 5
The R(QR(QR)) equivalent circuit model.
Figure 6
Figure 6
(a) Bode |Z| and (b) Bode Φ plots for (1) Ti-Zr alloy and (2) Ti-Zr-Ta alloy that were immersed in SBF for 1 h.
Figure 7
Figure 7
(a) Bode |Z| and (b) Bode Φ plots for (1) Ti-Zr alloy and (2) Ti-Zr-Ta alloy that were immersed in SBF for 72 h.
Figure 8
Figure 8
The CCT plots for (1) Ti-Zr alloy and (2) Ti-Zr-Ta alloy after (a) 1 h and (b) 72 h exposure to SBF solution, the applied potential was 400 mV, respectively.
Figure 9
Figure 9
The SEM and EDX for Ti-Zr alloy after its exposure for 3 days in SBF before stepping the potential to 400 mV.
Figure 10
Figure 10
The SEM and EDX for Ti-Zr-Ta alloy after its exposure for 3 days in SBF before stepping the potential to 400 mV.
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