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Corrosion behavior of TiO_2 films on Mg-Zn alloy in simulated body fluid

机译：镁锌合金上TiO_2薄膜在模拟体液中的腐蚀行为

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摘要

Magnesium alloys have been widely investigated in the field of biomaterials due to their moderate mechanical properties close to human bone and gradual degradation in human physiological environment without second surgeries. But results from clinical studies showed that magnesium implants suffered from too rapid degradation in human physiological environment. To reduce the degradation rate of magnesium alloys, surface modification is essential and effective besides element alloying. In this study, TiO_2 films were deposited on Mg-Zn alloy by direct current reactive magnetron sputtering. The morphology and structure of the films were characterized by atomic force microscopy (AFM), scanning electron microscope (SEM) and X-ray diffraction (XRD). The corrosion resistance in simulated body fluid (SBF) at 37℃ was evaluated by potentiodynamic polarization and hydrogen evolution tests. The corrosion behavior of the samples was investigated by SEM with energy dispersive spectroscopy (EDS) after immersion for different periods. The results showed that the compact films were composed of particles with the size of about 100 nm and could effectively improve the corrosion resistance in SBF. After immersion for 10 days, the corrosion rates of the substrates and samples with TiO_2 films were 4.13 mm/y and 1.95 mm/y, respectively. During the immersion, the Ti_2 films could induce the growth of hydroxyapatite (HAp) to improve the bioactivity of the samples.
机译：镁合金由于其接近人体骨骼的适度机械性能以及在无需二次手术的情况下在人体生理环境中逐渐降解，因此已在生物材料领域进行了广泛研究。但是临床研究结果表明，镁植入物在人体生理环境中降解得太快。为了降低镁合金的降解率，除了元素合金化之外，表面改性也是必不可少的和有效的。在这项研究中，通过直流反应磁控溅射在Mg-Zn合金上沉积TiO_2薄膜。通过原子力显微镜（AFM），扫描电子显微镜（SEM）和X射线衍射（XRD）表征了薄膜的形貌和结构。通过电势极化和析氢试验评估了在37℃下模拟体液（SBF）的耐腐蚀性。浸没不同时间后，用能谱仪（EDS）通过SEM研究了样品的腐蚀行为。结果表明，致密膜由约100 nm的颗粒组成，可有效提高SBF的耐蚀性。浸泡10天后，具有TiO_2膜的基材和样品的腐蚀速率分别为4.13 mm / y和1.95 mm / y。在浸泡过程中，Ti_2薄膜可以诱导羟基磷灰石（HAp）的生长，从而提高样品的生物活性。

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  • 来源
    《Applied Surface Science》 |2011年第9期|p.4464-4467|共4页
  • 作者

    Shuai Chen; Shaokang Guan; Bin Chen; Wen Li; Jun Wang; Liguo Wang; Shijie Zhu; Junhua Hu;

  • 作者单位

    Materials Research Centre, School of Materials Science and Engineering, Zhengzhou University, No. 97, Wenhua Road, Zhengzhou 450002, PR China;

    Materials Research Centre, School of Materials Science and Engineering, Zhengzhou University, No. 97, Wenhua Road, Zhengzhou 450002, PR China;

    Materials Research Centre, School of Materials Science and Engineering, Zhengzhou University, No. 97, Wenhua Road, Zhengzhou 450002, PR China;

    Graduate School of Science and Technology, Shizuoka University, Hamamatsu 432-8011, Japan;

    Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan;

    Materials Research Centre, School of Materials Science and Engineering, Zhengzhou University, No. 97, Wenhua Road, Zhengzhou 450002, PR China;

    Materials Research Centre, School of Materials Science and Engineering, Zhengzhou University, No. 97, Wenhua Road, Zhengzhou 450002, PR China;

    Materials Research Centre, School of Materials Science and Engineering, Zhengzhou University, No. 97, Wenhua Road, Zhengzhou 450002, PR China;

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  • 正文语种 eng
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  • 关键词

    Magnesium,TiO_2 film,Corrosion behavior,Simulated body fluid,HAp;

    机译：镁;TiO_2薄膜;腐蚀行为;模拟体液;HAp;

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