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不同鎂合金支架材料MAO/PLLA復(fù)合膜研究
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天津市應(yīng)用基礎(chǔ)及前沿技術(shù)研究計(jì)劃(天津市自然科學(xué)基金)資助（08JCZDJC17900）


Research of MAO/PLLA Composite Coating on Different Magnesium Alloy Stent Materials
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    摘要:

    兩種系列的鎂合金WE42與AM20微弧氧化（MAO）后用浸漬法對(duì)微弧氧化膜進(jìn)行聚乳酸（PLLA）封孔處理制備復(fù)合涂層，通過(guò)掃描電鏡（SEM）分析微弧氧化膜及聚乳酸封孔膜的表面形貌及結(jié)構(gòu)，X射線衍射（XRD）分析微弧氧化膜的主要成分為MgSiO3和SiO2，通過(guò)腐蝕失重測(cè)定試樣的失重率。在37 ℃的hank’s模擬體液中測(cè)定電化學(xué)阻抗(EIS)曲線，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，通過(guò)阻擋腐蝕離子擴(kuò)散提高了鎂合金的耐腐蝕性，同時(shí)制備生物相容性涂層，對(duì)于提高生物可吸收鎂合金血管支架的性能具有重要意義。

    Abstract:

    Micro-arc oxidation (MAO) layers which were prepared on magnesium alloy WE42 and AM20 by MAO were sealed with PLLA by immersion technique to get composite coatings. The microstructure of the MAO coatings and the composite coatings were analyzed by scanning electron microscopy. The composition of MAO coating is MgSiO3 and SiO2 by X-ray diffractometer (XRD) and the rate of mass loss were tested by immersion test. Electrochemical impedance spectroscopy (EIS) shows that PLLA coating seals the pores in the MAO coating and improves the corrosion resistance by preventing the corrosive ions from diffusing to the magnesium alloy substrate. This composite coating is of high biocompatibility so it is of significance to improve the property of bioabsorbable magnesium stent.

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逯 平,方銘中,曹 路,許鑫華.不同鎂合金支架材料MAO/PLLA復(fù)合膜研究[J].稀有金屬材料與工程,2011,40(12):2232~2235.[Lu Ping, Fang Mingzhong, Cao Lu, Xu Xinhua. Research of MAO/PLLA Composite Coating on Different Magnesium Alloy Stent Materials[J]. Rare Metal Materials and Engineering,2011,40(12):2232~2235.]
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  • 收稿日期:2010-12-18
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