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首页> 外文学位 >Corrosion behavior of microarc oxidation and polycaprolactone coatings applied to AZ31 magnesium alloy evaluated in simulated body fluid and balanced salt solution.
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Corrosion behavior of microarc oxidation and polycaprolactone coatings applied to AZ31 magnesium alloy evaluated in simulated body fluid and balanced salt solution.

机译：在模拟体液和平衡盐溶液中评估了应用于AZ31镁合金的微弧氧化和聚己内酯涂层的腐蚀行为。

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摘要

Recent research in orthopedic implant materials has focused on the use of magnesium alloys as a base material due to its mechanical properties similar to that of human bone. Rapid corrosion of magnesium materials in aqueous environments poses a significant hurdle to their application as a biomedical implant. A variety of coatings have been shown to improve the corrosion resistance of magnesium based materials in simulated body fluid environments including microarc oxidation and polymer coatings. However, formulation and corrosion rates vary significantly between solution types. Furthermore, in vivo results have shown that many common in vitro solutions over estimate corrosion rates. In addition to variations between solutions needing to be resolved, there has been little work performed to characterize large sample corrosion under stress. This is an essential step in evaluating concept performance at a macro scale, for application as a human implant.;The experiments performed and presented in this thesis primarily involve the comparison of conventional simulated body fluid (c-SBF) and Earle's balanced salt solution (EBSS). Samples evaluated in these environments are microarc oxidation (MAO) coated AZ31 magnesium alloy and polycaprolactone dip-coated AZ31. MAO coated samples were created for a range of process settings to observe the effect of processing on corrosion performance. A dependence of MAO coating thickness on process voltage was found which augmented the initial corrosion resistance values observed via electrochemical testing. Both MAO and PCL coatings were found to improve the corrosion resistance of the samples as compared to uncoated AZ31. It was found that all variations (MAO, PCL, and uncoated) showed a reduced corrosion rate in EBSS as compared to c-SBF. This corrosion reduction was apparent through potentiodynamic scanning, electrochemical impedance spectroscopy, and visual inspection. Preliminary mechanical corrosion results, in the form of constant extension testing, showed no dependence of corrosion on stress level. Future work may be aimed towards expanding modes of mechanical testing and further refining simulated body fluids to fit with in vivo test results.
机译：骨科植入物材料的最新研究集中于使用镁合金作为基础材料，这是因为其机械性能与人体骨骼相似。镁材料在水性环境中的快速腐蚀对其作为生物医学植入物的应用构成了很大的障碍。在模拟的体液环境中，包括微弧氧化和聚合物涂层，已显示出各种涂层可改善镁基材料的耐腐蚀性。但是，溶液类型之间的配方和腐蚀速率差异很大。此外，体内结果表明，许多常见的体外溶液超过了估计的腐蚀速率。除了需要解决的溶液之间的差异之外，几乎没有完成表征应力下大型样品腐蚀的工作。这是从宏观角度评估概念性能的关键步骤，可作为人体植入物使用。本论文进行的实验主要涉及对常规模拟体液（c-SBF）和Earle平衡盐溶液（ EBSS）。在这些环境中评估的样品是微弧氧化（MAO）涂层的AZ31镁合金和聚己内酯浸涂的AZ31。创建了用于一系列过程设置的MAO涂层样品，以观察过程对腐蚀性能的影响。发现MAO涂层厚度对工艺电压的依赖性，这增加了通过电化学测试观察到的初始耐腐蚀性值。与未涂层的AZ31相比，发现MAO和PCL涂层均可提高样品的耐腐蚀性。发现与c-SBF相比，所有变化（MAO，PCL和未涂层）都显示出EBSS的腐蚀速率降低。通过电位动力学扫描，电化学阻抗谱和目测可以明显看出这种腐蚀减少。初步的机械腐蚀结果以恒定延伸试验的形式表明，腐蚀与应力水平无关。未来的工作可能旨在扩大机械测试的模式，并进一步完善模拟体液以适合体内测试结果。

著录项

  • 作者

    Wilke, Benjamin M.;

  • 作者单位

    University of Alaska Fairbanks.;

  • 授予单位 University of Alaska Fairbanks.;
  • 学科 Mechanical engineering.;Materials science.;Biomedical engineering.
  • 学位 M.S.
  • 年度 2015
  • 页码 113 p.
  • 总页数 113
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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