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首页> 外文期刊>Acta biomaterialia >In-situ monitoring of the electrochemical behavior of cellular structured biomedical Ti-6Al-4V alloy fabricated by electron beam melting in simulated physiological fluid
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In-situ monitoring of the electrochemical behavior of cellular structured biomedical Ti-6Al-4V alloy fabricated by electron beam melting in simulated physiological fluid

机译：原位监测模拟生理流体中电子束熔化的电池结构生物医学Ti-6Al-4V合金电化学行为

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摘要

Ti-6Al-4V alloys with cellular structure fabricated by additive manufacturing are currently of significant interest because their modulus is comparable to bone and the cellular structure allows the cells to penetrate and exchange nutrients, promoting osseointegration. We describe here a unique simulation device that replaces the traditional steady electrochemistry approach, enabling in-situ study of variation of ion concentration and surface potential with pore depth for cellular structured Ti-6Al-4V alloys fabricated by electron beam melting (EBM) in phosphate buffered saline (PBS). This approach addresses the scientific gap on the electrochemical behavior of cellular structured titanium alloys. The study indicated that concentration of H+ and Cl- increased with the increase of pore depth, while the surface potential decreased. The exposed surface of inner cellular structure was not corroded but passivated after immersing in PBS at 37 degrees C for 14 days, which was independent of pore depth. Furthermore, X-ray photoelectron spectroscopy (XPS) and Mott-Schottky (M-S) studies suggested that a thinner passive film containing a greater donor density was formed on the surface of cellular structured Ti-6Al-4V alloy at the deepest pore depth. This is attributed to insufficient oxygen supply and Cl adsorption on the surface inside the pores.
机译：Ti-6Al-4V合金通过添加剂制造制造的细胞结构是具有重要兴趣的，因为它们的模量与骨骼相当，并且细胞结构允许细胞渗透和交换营养，促进骨整合。我们在这里描述了一种独特的仿真装置，取代了传统的稳态电化学方法，可以进取地研究离子浓度和表面电位的变化，其具有磷酸盐的孔结构化Ti-6Al-4V合金的孔深度孔深度缓冲盐水（PBS）。这种方法解决了细胞结构钛合金电化学行为的科学间隙。该研究表明，随着孔深度的增加，H +和CL-增加，而表面电位降低。内部细胞结构的暴露表面未腐蚀，但在37℃下浸入PBS后静置14天，其与孔深度无关。此外，X射线光电子能谱（XPS）和Mott-Schottky（M-S）研究表明，在最深孔深度的细胞结构Ti-6Al-4V合金的表面上形成含有更大供体密度的更薄的无源膜。这归因于含氧不足和孔内表面上的CL吸附。

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