Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/99383
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Type: Journal article
Title: Electrochemical properties of a novel β-Ta₂O₅ nanoceramic coating exposed to simulated body solutions
Other Titles: Electrochemical properties of a novel beta-Ta(2)O(5) nanoceramic coating exposed to simulated body solutions
Author: Xu, J.
Hu, W.
Xu, S.
Munroe, P.
Xie, Z.
Citation: ACS Biomaterials Science &​ Engineering, 2016; 2(1):73-89
Publisher: American Chemical Society
Issue Date: 2016
ISSN: 2373-9878
2373-9878
Statement of
Responsibility: 
Jiang Xu, Wei Hu, Song Xu, Paul Munroe, and Zong-Han Xie
Abstract: To enhance the corrosion resistance, biocompatibility and mechanical durability of biomedical titanium alloys, a novel β-Ta2O5 nanoceramic coating was developed using a double glow discharge plasma technique. The surface morphology, phase composition and microstructure of the as-deposited coating were examined by atomic force microscopy (AFM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The coating exhibits a striated structural pattern along the growth direction, which consists of equiaxed β-Ta2O5 grains, 15–20 nm in diameter in cross-section, showing a strong (001) preferred orientation. The mechanical properties and contact damage resistance of the β-Ta2O5 coating were evaluated by nanoindentation. Additionally, scratch tests were performed to evaluate the adhesion strength between the β-Ta2O5 coating and the Ti-6Al-4V substrate. The β-Ta2O5 coating shows high hardness combined with good resistance to both indentation and scratch damage, thus favoring it for long-term load-bearing application in the human body. Electrochemical behavior of the coating was analyzed in both a 0.9 wt % NaCl solution and Ringer’s solution at 37 °C, by various electrochemical analytical techniques, including potentiodynamic polarization, electrochemical impedance spectroscopy, potential of zero charge and Mott–Schottky analysis. Compared with uncoated Ti-6Al-4V and commercially pure tantalum, the β-Ta2O5 coating possesses a more positive Ecorr and lower icorr in both aqueous solutions, which is attributed to the thicker and denser β-Ta2O5 coating that provides more effective protection against corrosive attack. In addition, the β-Ta2O5 coating shows stable impedance behavior over 5 days immersion under both simulated body solutions, corroborated by the capacitance and resistance values extracted from the EIS data. Mott–Schottky analysis reveals that the β-Ta2O5 coating shows n-type semiconductor behavior and its donor density is independent of immersion time in both aqueous solutions. Its donor density is of the order of 1 × 1019 cm–3, which is an order of magnitude less than that of the passive films formed on either commercially pure Ta or uncoated Ti-6Al-4V. Moreover, according to the differences between corrosion potential and potential of zero charge, the β-Ta2O5 coating exhibits a greater propensity to repulse chloride ions than both commercially pure Ta and uncoated Ti-6Al-4V. Therefore, the newly developed coating could be used to protect the surface of biomedical titanium alloys under harsh conditions.
Keywords: tantalum pentoxide; biomedical titanium alloy; corrosion behavior; simulated body solutions; EIS
Description: Published: November 30, 2015
Rights: © 2015 American Chemical Society
RMID: 0030044981
DOI: 10.1021/acsbiomaterials.5b00384
Grant ID: http://purl.org/au-research/grants/arc/DP150102417
Appears in Collections:Mechanical Engineering publications

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