阳极氧化高纯镁表面形成超疏水硬脂酸层提高生物可降解植入物的耐腐蚀性
Super-Hydrophobic Stearic Acid Layer Formed on Anodized High Purified Magnesium for Improving Corrosion Resistance of Biodegradable Implants
摘要：
镁及其合金是生物可降解植入物的理想候选物。然而，对于大多数应用来说，它们在人体中溶解得太快。采用硬脂酸对高纯镁进行表面包覆，以减缓高纯镁在37°C模拟体液中的腐蚀速率。将HP-Mg阳极氧化形成氧化物/氢氧化物层，然后将其浸入硬脂酸溶液中。采用电化学阻抗谱和动电位极化法研究了HP-Mg试样的腐蚀速率。结果表明，疏水涂层可以暂时降低HP-Mg的腐蚀速率1000倍。
英文摘要：
Magnesium and its alloys are ideal candidates for biodegradable implants. However, they can dissolve too rapidly in the human body for most applications. In this research, high purified magnesium (HP-Mg) was coated with stearic acid in order to slow the corrosion rate of magnesium in simulated body fluid at 37°C. HP-Mg was anodized to form an oxide/hydroxide layer, then it was immersed in a stearic acid solution. Electrochemical impedance spectroscopy and potentiodynamic polarization were used to estimate the corrosion rate of HP-Mg specimens. The results confirm that the hydrophobic coating can temporarily decrease the corrosion rate of HP-Mg by 1000x.
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