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首页> 外文期刊>Journal of Materials Engineering and Performance >Corrosion Behavior of Surface-Treated Implant Ti-6Al-4V by Electrochemical Polarization and Impedance Studies
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Corrosion Behavior of Surface-Treated Implant Ti-6Al-4V by Electrochemical Polarization and Impedance Studies

机译：表面处理的植入物Ti-6Al-4V的电化学极化和阻抗研究

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摘要

Implant materials for orthopedic and heart surgical services demand a better corrosion resistance material than the presently used titanium alloys, where protective oxide layer breaks down on a prolonged stay in aqueous physiological human body, giving rise to localized corrosion of pitting, crevice, and fretting corrosion. A few surface treatments on Ti alloy, in the form of anodization, passivation, and thermal oxidation, followed by soaking in Hank solution have been found to be very effective in bringing down the corrosion rate as well as producing high corrosion resistance surface film as reflected from electrochemical polarization, cyclic polarization, and Electrochemical Impedance Spectroscopy (EIS) studies. The XRD study revealed the presence of various types of oxides along with anatase and rutile on the surface, giving rise to high corrosion resistance film. While surface treatment of passivation and thermal oxidation could reduce the corrosion rate by 1/5th, anodization in 0.3 M phosphoric acid at 16 V versus stainless steel cathode drastically brought down the corrosion rate by less than ten times. The mechanism of corrosion behavior and formation of different surface films is better understood from the determination of EIS parameters derived from the best-fit equivalent circuit.
机译：与目前使用的钛合金相比，用于骨科和心脏外科手术的植入物材料需要一种更好的耐腐蚀性材料，后者在长时间停留在生理人体水中时会破坏保护性氧化层，从而导致点蚀，缝隙和微动腐蚀的局部腐蚀。已经发现，对钛合金进行一些表面处理，例如阳极氧化，钝化和热氧化，然后浸入汉克溶液中，对降低腐蚀速率以及产生高耐腐蚀的表面膜非常有效。来自电化学极化，循环极化和电化学阻抗谱（EIS）的研究。 XRD研究表明，表面上存在各种类型的氧化物以及锐钛矿和金红石，从而形成了高耐蚀性的薄膜。尽管钝化和热氧化的表面处理可以将腐蚀速率降低1/5，但是在0.3 V磷酸中以16 V进行阳极氧化（与不锈钢阴极相比）却大大降低了腐蚀速率不到十倍。通过确定由最佳拟合等效电路得出的EIS参数，可以更好地理解腐蚀行为和形成不同表面膜的机理。

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