Tribocorrosion behaviour of pure titanium in bovine serum albumin solution: A multiscale study.
Tribocorrosion behaviour of pure titanium in bovine serum albumin solution: A multiscale study.
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DOI：
10.1016/j.jmbbm.2019.103511
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发表时间：
2020-02
影响因子：
3.9
通讯作者：
Evangelos Liamas;O. Thomas;A. I. Muñoz;Z. Zhang
中科院分区：
文献类型：
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作者：
Evangelos Liamas;O. Thomas;A. I. Muñoz;Z. Zhang
系统研究了纯钛在磷酸盐缓冲液（PBS）中的摩擦腐蚀行为与表面化学性质和溶液中牛血清白蛋白（BSA）含量的关系。采用球盘式摩擦磨损试验机和电化学池研究了电化学条件（即阳极和阴极外加电位以及开路电位）对钛的摩擦腐蚀响应的影响。结果表明，材料损耗主要是由于塑性变形引起的机械磨损。在阳极条件下的机械磨损高于阴极条件下的机械磨损，部分原因是在滑动界面处充当第三体的碎片颗粒的存在增加。BSA对氧化铝和钛之间的相互作用，以及在机械磨损过程中的第三体的行为的影响，在纳米级水平上使用原子力显微镜基于力谱进行了研究。结果发现，BSA的存在以各种方式影响摩擦腐蚀。首先，它通过抑制阴极反应和加速阳极反应来增加氧化膜的再钝化速率。其次，它通过增加碎屑在滑动界面上的粘附来增加机械磨损，而在阳极条件下，它增加了碎屑颗粒的滚动效率，从而进一步增强了机械磨损。
Tribocorrosion behaviour of pure titanium in phosphate buffer saline (PBS) solution has been investigated systematically as a function of surface chemistry and bovine serum albumin (BSA) content in the solution. A ball-on-disk tribometer coupled with an electrochemical cell was used to study the effect of electrochemical conditions (i.e. anodic and cathodic applied potentials, as well as at open circuit potential) on the tribocorrosion response of titanium. It was found that the main material loss is due to mechanical wear caused by plastic deformation. The mechanical wear was higher under anodic conditions than under cathodic, partially due to an increased presence of debris particles at the sliding interface that act as third bodies. The effect of BSA on the interaction between alumina and titanium, as well as the behaviour of third bodies during the mechanical wear, were investigated in the nanoscale level using atomic force microscopy based force spectroscopy. It was found that the presence of BSA affects tribocorrosion in various ways. Firstly, it increases the repassivation rate of the oxide film by inhibiting the cathodic reactions and accelerating the anodic reactions. Secondly, it increases the mechanical wear by increasing the adhesion of debris onto the sliding interface, while at anodic conditions it increases the rolling efficiency of the debris particles that further enhances the mechanical wear.