Electrochemical Behavior of Titanium in Artificial Saliva: Influence of pH
Electrochemical Behavior of Titanium in Artificial Saliva: Influence of pH
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DOI：
10.1563/aaid-joi-d-11-00054
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发表时间：
2014-02-01
影响因子：
1.6
通讯作者：
Sukotjo, Cortino
中科院分区：
文献类型：
--
作者：
Abey, Savithri;Mathew, Mathew T.;Sukotjo, Cortino
钛是牙科植入物最常见的材料，因为它具有高度耐腐蚀性，因为它会不断形成保护性的钝化膜层。钝化膜层的形成和组成取决于环境条件。如果稳定的氧化层被破坏，下面的钛表面会被腐蚀。本研究的目的是确定商业纯钛（CpTi）合金在人工唾液中的基本腐蚀是否受pH值的影响，并了解CpTi作为pH值的函数的腐蚀动力学/机制。在本研究中，钛合金圆盘进行腐蚀试验。在测试之前，使用标准金相制备方法对所有样品进行清洁和抛光。以人工唾液为试验介质。测试了以下pH值：3.0、4.5、6.0、6.5、7.5和9.0。通过添加适量的乳酸（酸性）或NaOH（碱性）来实现不同的pH值。动电位曲线表明，在每个pH值的行为变化。此外，从动电位曲线确定的腐蚀电流密度值表现出最差的耐腐蚀性为pH 7.5。Nyquist图（来自电化学阻抗谱结果）表明pH 7.5具有最差的电阻。扫描电子显微镜图像表明，6.5，7.5和9.0的pH值水平有相当大的表面腐蚀。结果表明，介质pH值对CpTi的腐蚀行为有显著影响。在中性pH下的不良腐蚀行为引起了一些关注，并强调了进一步研究的必要性。
Titanium is the most common material chosen for dental implants because it is highly corrosion resistant because it constantly reforms a protective passive film layer. The formation and composition of the passive film layer is dependent on the environmental conditions. If the stable oxide layer is damaged, the titanium surface underneath can corrode. The purpose of this study was to determine if basic corrosion of commercially pure titanium (CpTi) alloy in artificial saliva was affected by pH and to understand the corrosion kinetics/mechanisms of CpTi as a function of pH. In this study, titanium alloy discs were subjected to corrosion tests. Before the tests, all samples were cleaned and polished using standard metallographic preparation methods. Artificial saliva was used as the testing medium. The following pH values were tested: 3.0, 4.5, 6.0, 6.5, 7.5, and 9.0. Different pH values were achieved by adding lactic acid (acidic) or NaOH (basic) in appropriate amounts. Potentiodynamic curves indicated behavior change at each pH. In addition, the corrosion current density value determined from the potentiodynamic curve exhibited the poorest corrosion resistance for pH 7.5. The Nyquist plot (from the electrochemical impedance spectroscopy results) indicated that pH 7.5 had the poorest resistance. Scanning electron microscopy images indicated that pH levels of 6.5, 7.5, and 9.0 had considerable surface corrosion. The results showed that the media's pH significantly influenced the corrosion behavior of CpTi. The poor corrosion behavior at the neutral pHs invites some concerns and highlights the need for further study.