The estimation of corrosion behavior of thermal oxidized TiNbTaZr alloys for biomedical applications
The estimation of corrosion behavior of thermal oxidized TiNbTaZr alloys for biomedical applications
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DOI：
10.1002/maco.201307502
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发表时间：
2015-04
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影响因子：
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通讯作者：
D. Mareci;G. Bolat;C. Munteanu;N. Ghiban;A. Cailean
中科院分区：
文献类型：
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作者：
D. Mareci;G. Bolat;C. Munteanu;N. Ghiban;A. Cailean
研究了两种TiNbTaZr合金(Ti25Nb8Ta10Zr和Ti21Nb15Ta6Zr)在500℃和800℃下，在0.9wt%的氯化钠溶液中氧化2 h的腐蚀行为。用电化学技术：电化学阻抗谱(EIS)和动电位极化曲线对两个样品进行了检测。从交流阻抗谱和动电位极化曲线得到的电化学腐蚀参数表明，未处理和氧化处理的TiNbTaZr合金具有典型的钝化行为。EIS研究表明，两种氧化样品的高阻抗值都随着暴露时间的延长而增加。极化结果表明，氧化后的TiNbTaZr合金具有良好的耐腐蚀性，低的腐蚀和阳极电流密度证实了这一点。500℃和800℃空气中的氧化不表现出0.9wt%氯化钠溶液中局部腐蚀过程的敏感性。另外，用扫描电子显微镜(SEM)观察了在0.9wt%的氯化钠溶液中极化后的表面形貌。在0.9wt%的氯化钠溶液中，氧化后的Ti21Nb15Ta6Zr合金比氧化后的Ti25Nb8Ta10Zr合金具有更好的耐蚀性。
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.