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Molybdenum - A biodegradable implant material for structural applications?

机译:钼 - 用于结构应用的可生物降解的植入物材料?

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摘要

Molybdenum as a potentially new biodegradable material was investigated. Degradation behavior of commercially high purity molybdenum was observed in simulated physiological salt solutions (Kokubo's SBF with/without TRIS-HCI, Cu2+ addition and 0.9% NaCl solution). Potentiodynamic polarization, immersion mass loss and ion concentration measurements paired with REM/EDX analysis reveal gradual dissolution of molybdenum in the proper order of magnitude for stent application, associated with formation of thin, non-passivating corrosion products. The underlying corrosion mechanism is discussed as well as a comparison to literature data. However, formation of calcium phosphates (CaP) in SBF significantly decreases corrosion rates. In-situ polarization was found to be a potential way for overcoming this problem and simultaneously enhancing corrosion above the benchmark for a degradable stent material.
机译:研究了作为潜在的新可生物降解材料的钼。 在模拟的生理盐溶液中观察到商业上高纯度钼的降解行为(Kokubo的SBF,带有/不带Tris-HCi,Cu2 +加成和0.9%NaCl溶液)。 与REM / EDX分析配对的电位显微偏振,浸渍质量损失和离子浓度测量揭示了钼以适当的级别用于支架应用的逐渐溶解,与形成薄,非钝化腐蚀产物的形成相关。 讨论了潜在的腐蚀机制以及与文献数据的比较。 然而,SBF中磷酸钙(帽)的形成显着降低了腐蚀速率。 发现原位偏振是克服该问题的潜在方法,并同时增强基准的基准以获得可降解支架材料的腐蚀。

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