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Magnesium in the murine artery: Probing the products of corrosion

机译:鼠动脉中的镁:探查腐蚀产物

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Many publications are available on the physiological and pseudophysiological corrosion of magnesium and its alloys for bioabsorbable implant application, yet few focus on the characterization of explanted materials. In this work, commercially pure magnesium wires were corroded in the arteries of rats for up to 1 month, removed, and both bulk and surface products characterized. Surface characterization using infrared spectroscopy revealed a duplex structure comprising heavily magnesium-substituted hydroxyapatite that later transformed into an A-type (carbonate-substituted) hydroxyapatite. To explain this transformation, an ion-exchange mechanism is suggested. Elemental mapping of the bulk products of biocorrosion revealed the elemental distribution of Ca, P, Mg and O in the outer and Mg, O and P in the inner layers. Carbon was not observed in any significant quantity from the inner corrosion layer, suggesting that carbonates are not a prevalent product of corrosion. Backscatter electron imaging of cross-sections showed that thinning or absence of the hydroxyapatite in the later stages of degradation is related to local thickening of the inner corrosion layer. Based on these experimental observations, mechanisms describing corrosion in the quasi-steady state and during terminal breakdown of the magnesium specimens are proposed.
机译:关于镁及其合金在生物可吸收植入物应用中的生理和假生理腐蚀,有许多出版物,但很少有人关注外植材料的特性。在这项工作中,商业纯镁线在大鼠动脉中被腐蚀长达1个月,将其去除,并且对散装产品和表面产品进行了表征。使用红外光谱的表面表征揭示了包含重度镁取代的羟基磷灰石的双相结构,其随后转变为A型(碳酸盐取代的)羟基磷灰石。为了解释这种转变,提出了一种离子交换机理。大量生物腐蚀产物的元素图谱显示,Ca,P,Mg和O的元素分布在外层,而Mg,O和P在内层。从内部腐蚀层中未观察到大量的碳,这表明碳酸盐不是腐蚀的普遍产物。截面的反向散射电子成像显示,在降解的后期阶段,羟基磷灰石变薄或不存在与内部腐蚀层的局部增厚有关。基于这些实验观察结果,提出了描述镁试样准稳态和终极击穿过程中腐蚀的机理。

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