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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >The influence of buffer system and biological fluids on the degradation of magnesium
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The influence of buffer system and biological fluids on the degradation of magnesium

机译：缓冲系统和生物流体对镁降解的影响

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Abstract The influence of frequently used buffer system 4‐(2‐hydroxyethyl)?1‐piperazineethanesulfonic acid (HEPES) compared to CO 2 / HCO 3 ‐ on the corrosion of magnesium is investigated. Samples were immersed in simulated body fluid (m‐SBF) while monitored by electrochemical impedance spectroscopy (EIS) for up to 30 days. In CO 2 / HCO 3 ‐ the initial corrosion rate was 0.11 mm yr ?1 . An inner protective layer of magnesium oxide was formed within the first 30 min exposure and subsequently covered by an outer layer of apatite within 24 h . The corrosion mechanism thereafter is best described as passive pitting with a porosity of ～10%. Using HEPES as buffer agent increased the corrosion rate to 3.37 mm yr ?1 . Cross sectional microscopy show a porous outer corrosion layer allowing rapid diffusion of aggressive ions through the film. Here the EIS results are best described by an active pitting model with an inner layer 5 to 10 times less protective compared to the inner layer formed without HEPES. Further the suitability of human whole blood and plasma as in vitro models for Mg degradation was evaluated. Mg corrosion caused coagulation after 24 h in both biological fluids. The corrosion during the first 24 h is similar to the corrosion in m‐SBF with HEPES. ? 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 105B: 1490–1502, 2017.
机译：摘要研究了与CO 2 / HCO 3相比常用缓冲系统4-（2-羟乙基）4-（2-羟乙基）磺酸（HEPES）对镁的腐蚀的影响。将样品浸入模拟的体液（M-SBF），同时通过电化学阻抗光谱（EIS）监测长达30天。在CO 2 / HCO 3中 - 初始腐蚀速率为0.11mm YR？1。在前30分钟的暴露内形成氧化镁的内部保护层，然后在24小时内被磷灰石的外层覆盖。此后的腐蚀机制最好被描述为具有〜10％的孔隙率的被动点。使用HEPES作为缓冲剂将腐蚀速率提高到3.37mm YR？1。横截面显微镜显示多孔外腐蚀层，允许通过薄膜快速扩散侵蚀性离子。这里，EIS结果最好由与没有HEPES形成的内层相比，内层的有源点蚀模型最佳地描述，内层5至10倍的保护性。此外，评价了人类全血和血浆作为体外模型进行Mg降解的适用性。 Mg腐蚀在两种生物流体中24小时后引起凝结。前24小时内的腐蚀类似于M-SBF的腐蚀性，具有HEPES。还2016 Wiley期刊，INC.J生物保解率B部分：苹果生物检索物，105B：1490-1502,2017。

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