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两种系列的镁合金WE42与AM20微弧氧化(MAO)后用浸渍法对微弧氧化膜进行聚乳酸(PLLA)封孔处理制备复合涂层,通过扫描电镜(SEM)分析微弧氧化膜及聚乳酸封孔膜的表面形貌及结构,X射线衍射(XRD)分析微弧氧化膜的主要成分为MgSiO3和SiO2,通过腐蚀失重测定试样的失重率。在37℃的hank’s模拟体液中测定电化学阻抗(EIS)曲线,表明采用生物相容性好的PLLA有效的填充了微弧氧化膜表面的微孔,通过阻挡腐蚀离子扩散提高了镁合金的耐腐蚀性,同时制备生物相容性涂层,对于提高生物可吸收镁合金血管支架的性能具有重要意义。
Two series of magnesium alloy WE42 and AM20 MAO were impregnated with polylactic acid (PLLA) to prepare composite coatings by impregnation method. The micro-arc oxidation coatings were analyzed by SEM Surface Morphology and Structure of Poly (lactic acid) Sealing Membrane, XRD Analysis The main components of MAO coating are MgSiO3 and SiO2, and the weight loss rate of the sample is determined by corrosion loss. Electrochemical impedance (EIS) curves were measured in hank’s simulated body fluid at 37 ° C, indicating that the biocompatible PLLA effectively filled the micro-pores on the surface of the micro-arc oxidation film and improved the resistance to magnesium alloy by blocking corrosion ion diffusion Corrosive, while the preparation of biocompatible coatings, for improving the performance of bioabsorbable magnesium alloy stent is of great significance.