Characterization and corrosion evaluation of TiO2:n-HA coatings on titanium alloy formed by plasma electrolytic oxidation
Characterization and corrosion evaluation of TiO2:n-HA coatings on titanium alloy formed by plasma electrolytic oxidation
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DOI：
10.1016/j.surfcoat.2015.01.022
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发表时间：
2015-05-15
影响因子：
5.4
通讯作者：
Maev, R. Gr.
中科院分区：
文献类型：
--
作者：
Dzhurinskiy, D.;Gao, Y.;Maev, R. Gr.
在本研究中，一种新的二氧化钛基涂层含有纳米羟基磷灰石（n-HA）已形成市售的Ti-6Al-4V（5级）合金基板上的等离子体电解氧化（PEO）技术。在含有悬浮羟基磷灰石纳米颗粒的磷酸氢二钠水溶液中，采用脉冲双极电流模式沉积TiO 2：n-HA涂层。用扫描电子显微镜（SEM）观察了涂层的表面形貌，用能谱仪（EDS）分析了涂层的元素组成。通过傅里叶变换红外光谱（FTIR）分析了所形成涂层内HA纳米颗粒的存在。采用开路电位、动电位极化和交流阻抗等电化学方法研究了TiO 2：n-HA涂层的耐腐蚀性能，并与纯钛的腐蚀行为进行了比较。结果表明，所制备的PEO涂层呈多孔网状结构，纳米羟基磷灰石颗粒均匀分布在涂层表面。与裸Ti-6Al-4V基材材料相比，PEO涂覆的样品显示出显著更高的耐腐蚀性。PEO修饰的TiO 2：n-HA涂层可降低钛合金种植体材料的腐蚀，并可作为生物活性仿生涂层，提高种植体表面生物活性和骨结合能力。(C)2015 Elsevier B. V.版权所有。
In the present study, a novel TiO2-based coating containing nanosized hydroxyapatite (n-HA) has been formed on commercially available Ti-6Al-4V (Grade 5) alloy substrates by the Plasma Electrolytic Oxidation (PEO) technique. The TiO2:n-HA coating deposition was provided in an aqueous solution of disodium hydrogen phosphate containing suspended hydroxyapatite nanoparticles under a pulsed bipolar current mode. The surface morphology of the formed coatings has been examined by Scanning Electron Microscopy (SEM), while the element composition of the coatings has been determined by Energy Dispersive X-ray analysis (EDS). The presence of HA nanoparticles within the formed coatings has been analyzed by Fourier Transform Infrared Spectroscopy (FTIR). The corrosion resistance of the TiO2:n-HA coatings has been studied by electrochemical methods, including open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy, and compared to the corrosion behavior of bare titanium. The results indicate that the formed PEO coatings exhibit a porous network structure with embedded n-HA particles uniformly distributed over the entire surface of the coatings. The PEO coated samples showed substantially higher corrosion resistance compared to the bare Ti-6Al-4V substrate material. The PEO-formed TiO2:n-HA layers reduce the corrosion of titanium alloy implant materials and can be used as a bioactive biomimetic coating to enhance implant surface bioactivity and osseointegration. (C) 2015 Elsevier B.V. All rights reserved.