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首页> 外文期刊>Acta biomaterialia >A system for characterizing Mg corrosion in aqueous solutions using electrochemical sensors and impedance spectroscopy
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A system for characterizing Mg corrosion in aqueous solutions using electrochemical sensors and impedance spectroscopy

机译：一种使用电化学传感器和阻抗谱表征水溶液中Mg腐蚀的系统

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Understanding Mg corrosion is important to the development of biomedical implants made from Mg alloys. Mg corrodes readily in aqueous environments, producing H2, OH- and Mg2+. The rate of formation of these corrosion products is especially important in biomedical applications where they can affect cells and tissue near the implant. We have developed a corrosion characterization system (CCS) that allows realtime monitoring of the solution soluble corrosion products OH-, Mg 2+, and H2 during immersion tests commonly used to study the corrosion of Mg materials. Instrumentation was developed to allow the system to also record electrochemical impedance spectra simultaneously in the same solution to monitor changes in the Mg samples. We demonstrated application of the CCS by observing the corrosion of Mg (99.9%) in three different corrosion solutions: NaCl, HEPES buffer, and HEPES buffer with NaCl at 37 C for 48 h. The solution concentrations of the corrosion products measured by sensors correlated with the results using standard weight loss measurements to obtain corrosion rates. This novel approach gives a better understanding of the dynamics of the corrosion process in realtime during immersion tests, rather than just providing a corrosion rate at the end of the test, and goes well beyond the immersion tests that are commonly used to study the corrosion of Mg materials. The system has the potential to be useful in systematically testing and comparing the corrosion behavior of different Mg alloys, as well as protective coatings.
机译：了解镁腐蚀对于由镁合金制成的生物医学植入物的开发非常重要。 Mg在水性环境中容易腐蚀，产生H2，OH-和Mg2 +。这些腐蚀产物的形成速率在生物医学应用中尤其重要，因为它们会影响植入物附近的细胞和组织。我们开发了一种腐蚀表征系统（CCS），可以在通常用于研究Mg材料腐蚀的浸没测试过程中实时监控溶液中的可溶性腐蚀产物OH-，Mg 2+和H2。开发了仪器，以使系统还可以在同一溶液中同时记录电化学阻抗谱，以监测镁样品中的变化。我们通过观察三种不同腐蚀溶液中的Mg（99.9％）腐蚀来证明CCS的应用：NaCl，HEPES缓冲液和带有NaCl的HEPES缓冲液在37°C下48 h。传感器测量的腐蚀产物的溶液浓度与使用标准失重测量获得的腐蚀速率相关联。这种新颖的方法可以更好地理解浸入测试过程中实时的腐蚀过程动态，而不仅仅是在测试结束时提供腐蚀速率，并且远远超出了通常用于研究浸蚀测试的浸入测试。镁材料。该系统有潜力用于系统地测试和比较不同镁合金以及保护层的腐蚀行为。

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