Mechanical and corrosion properties of newly developed biodegradable Zn-based alloys for bone fixation
Mechanical and corrosion properties of newly developed biodegradable Zn-based alloys for bone fixation
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DOI：
10.1016/j.actbio.2011.05.008
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发表时间：
2011-09-01
影响因子：
9.7
通讯作者：
Novak, P.
中科院分区：
文献类型：
--
作者：
Vojtech, D.;Kubasek, J.;Novak, P.
在目前的工作中，研究了镁含量高达 3 wt.% 的锌镁合金作为潜在的医用可生物降解材料。研究了这些合金的组织、力学性能和腐蚀行为，并与纯镁、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。通过浸泡试验、动电位测量以及腐蚀过程中pH值变化监测，确定了材料在pH值为5、7和10的模拟体液中的腐蚀行为。通过扫描电镜、能量色散光谱和 X 射线光电子能谱研究了腐蚀合金的表面。结果发现，当镁含量约为 1 wt.% 时，最大强度和伸长率分别达到 150 MPa 和 2%。这些机械性能与合金的结构特征有关。 Zn-Mg 合金的腐蚀速率被确定为显着低于 Mg 和 AZ91HP 合金。前一种合金的腐蚀速度约为每年数十微米，而后者的腐蚀速度约为每年数百微米。根据锌合金的腐蚀行为估计了可能的锌剂量和毒性。结果发现，与锌的生物每日耐受限量相比，这些剂量可以忽略不计。 (C) 2011 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
In the present work Zn-Mg alloys containing up to 3 wt.% 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 150 MPa and 2%, respectively, were achieved at Mg contents of approximately 1 wt.%. 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. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.