Electrochemical behavior of cold sprayed hydroxyapatite/titanium composite in Hanks’ solution
Electrochemical behavior of cold sprayed hydroxyapatite/titanium composite in Hanks’ solution
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DOI：
10.1016/j.electacta.2012.01.018
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发表时间：
2012-03
影响因子：
6.6
通讯作者：
Xuan Zhou;P. Mohanty
中科院分区：
文献类型：
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作者：
Xuan Zhou;P. Mohanty
采用冷喷涂技术在钛基体上制备了存款HAP/Ti复合涂层。评价了冷喷涂20wt%和50wt% HAP/Ti复合涂层在模拟生物医学环境中的电化学腐蚀行为。利用X射线衍射仪（XRD）和扫描电镜（SEM）对涂层的物相和形貌进行了分析。采用动电位极化曲线和电化学阻抗谱技术研究了合金在Hanks溶液中的腐蚀行为。通过显微硬度测试和剪切冲裁试验研究了复合材料的力学性能。结果表明，冷喷涂20wt%HAP/Ti涂层在Hanks溶液中的腐蚀电流比纯Ti和50wt%HAP/Ti涂层大，表明涂层的耐蚀性较低。喷涂后热处理显著改善了涂层的耐蚀性和力学性能。本工作中获得的结果表明冷喷涂技术在钛基体上制备HAP/Ti复合涂层作为生物医学应用的承重植入材料的适用性。
A novel approach-cold spraying technique has been successfully used to deposit HAP/Ti composite coating on titanium substrate. The electrochemical corrosion behavior of cold sprayed 20wt% and 50wt% HAP/Ti composite coating has been evaluated in a simulated biomedical environment. X-ray diffraction (XRD) analysis and scanning electron microscopy were applied to identify the phases and the morphologies of the coatings. Potentiodynamic polarization and EIS techniques were used to analyze the corrosion behavior in Hanks’ solution. The microhardness measurements and shear punch tests were also conducted to investigate the mechanical property. It was found that cold sprayed 20wt% HAP/Ti coating showed relatively higher corrosion current than pure Ti and 50wt% HAP/Ti coating in Hanks’ solution, which indicates a low corrosion resistance. However, the post spray heat treatment improved the corrosion and mechanical properties remarkably. The results obtained in the present work demonstrate suitability of cold spraying technique to manufacture HAP/Ti composite coating on titanium substrate as load-bearing implant material for biomedical applications.