Magnesium alloys have been investigated as temporary biomaterials for orthopedic applications. Despite their high osseointegration and mechanical (bone-like) properties, Mg alloys quickly degrade in simulated physiological media. Surface coatings can be deposited onto Mg alloys to slow the corrosion rate of these biomaterials in chloride-rich environments. TiO₂ films show high potential for improving the corrosion resistance of magnesium alloys. This article presents the structural observations and corrosion behavior of TiO₂ thin films deposited onto a MgCa2Zn1Gd3 alloy using atomic layer deposition (ALD). Surface morphologies were observed using scanning electron microscopy (SEM) and atomic force microscopy (AFM), and Raman analysis of the deposited TiO₂ films was also carried out. The corrosion behavior of the uncoated alloy and the alloy coated with TiO₂ was measured in Ringer’s solution at 37 °C using electrochemical and immersion tests. The microscopic observations of the TiO₂ thin films with a thickness of about 52.5 and 70 nm showed that the surface morphology was homogeneous without visible defects on the TiO₂ surface. The electrochemical and immersion test results showed that the thin films decreased the corrosion rate of the studied Mg-based alloy, and the corrosion resistance was higher in the thicker TiO₂ film.

中文翻译：

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ALD沉积在生物医学镁合金上的TiO2薄膜的结构和腐蚀行为

镁合金已经作为骨科应用的临时生物材料进行了研究。尽管镁合金具有很高的骨整合度和机械（类骨）特性，但它们在模拟的生理介质中会迅速降解。可以在镁合金上沉积表面涂层，以减缓这些生物材料在富含氯化物的环境中的腐蚀速度。TiO ₂膜具有提高镁合金耐腐蚀性的潜力。本文介绍了使用原子层沉积（ALD）沉积在MgCa2Zn1Gd3合金上的TiO ₂薄膜的结构观察和腐蚀行为。使用扫描电子显微镜（SEM）和原子力显微镜（AFM）观察了表面形貌，并对沉积的TiO ₂进行了拉曼分析电影也进行了。使用电化学和浸没测试，在37℃的林格氏溶液中测量了未涂层合金和TiO ₂涂层合金的腐蚀行为。对厚度约为52.5nm和70nm的TiO ₂薄膜的显微观察表明，表面形态是均匀的，在TiO ₂表面上没有可见的缺陷。电化学和浸没测试结果表明，薄膜降低了所研究的Mg基合金的腐蚀速率，并且较厚的TiO ₂膜的耐蚀性更高。