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首页> 外文期刊>Acta biomaterialia >Mechanical and corrosion properties of newly developed biodegradable Zn-based alloys for bone fixation.
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Mechanical and corrosion properties of newly developed biodegradable Zn-based alloys for bone fixation.

机译：新开发的用于骨骼固定的可生物降解的Zn基合金的机械和腐蚀性能。

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摘要

In the present work Zn-Mg alloys containing up to 3wt.% Mg were studied as potential biodegradable materials for medical use. The structure, mechanical properties and corrosion behavior of these alloys were investigated and compared with those of pure Mg, AZ91HP and casting Zn-Al-Cu alloys. The structures were examined by light and scanning electron microscopy (SEM), and tensile and hardness testing were used to characterize the mechanical properties of the alloys. The corrosion behavior of the materials in simulated body fluid with pH values of 5, 7 and 10 was determined by immersion tests, potentiodynamic measurements and by monitoring the pH value evolution during corrosion. The surfaces of the corroded alloys were investigated by SEM, energy-dispersive spectrometry and X-ray photoelectron spectroscopy. It was found that a maximum strength and elongation of 150MPa and 2%, respectively, were achieved at Mg contents of approximately 1wt.%. These mechanical properties are discussed in relation to the structural features of the alloys. The corrosion rates of the Zn-Mg alloys were determined to be significantly lower than those of Mg and AZ91HP alloys. The former alloys corroded at rates of the order of tens of microns per year, whereas the corrosion rates of the latter were of the order of hundreds of microns per year. Possible zinc doses and toxicity were estimated from the corrosion behavior of the zinc alloys. It was found that these doses are negligible compared with the tolerable biological daily limit of zinc.
机译：在当前的工作中，研究了含镁量高达3wt。％的Zn-Mg合金，作为潜在的可生物降解的医用材料。研究了这些合金的结构，力学性能和腐蚀行为，并与纯Mg，AZ91HP和铸造Zn-Al-Cu合金进行了比较。通过光学和扫描电子显微镜（SEM）检查结构，并使用拉伸和硬度测试来表征合金的机械性能。通过浸没试验，电位动力学测量以及通过监测腐蚀过程中pH值的变化来确定材料在pH值为5、7和10的模拟体液中的腐蚀行为。通过SEM，能量色散光谱法和X射线光电子能谱研究了腐蚀合金的表面。发现当Mg含量为约1wt。％时，最大强度和伸长率分别达到150MPa和2％。这些机械性能是根据合金的结构特征进行讨论的。经测定，Zn-Mg合金的腐蚀速率明显低于Mg和AZ91HP合金。前者的合金每年的腐蚀速率为几十微米，而后者的腐蚀速率为每年数百微米。根据锌合金的腐蚀行为估计可能的锌剂量和毒性。发现与锌的可忍受的生物学每日极限相比，这些剂量可以忽略不计。

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