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OALib Journal期刊
ISSN: 2333-9721
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热--自组装单分子膜表面改性镁生物材料的腐蚀降解
Keywords: 材料失效与保护,镁,表面改性,腐蚀降解,热自组装膜
Abstract:
？将mg和mg--ca合金进行热--自组装单分子膜表面改性,并将其试样浸泡在sbf中和植入动物体内进行比较试验,用lkii98b测试腐蚀电流密度,用原子吸收光谱测定溶液中的镁离子浓度,测量试样的质量和溶液ph值的变化,用sem、xrd,ftir、eds等分析其表面形貌、物相组成和成分变化,研究了材料的腐蚀降解特性.结果表明,热自组装膜改善了镁基生物材料的腐蚀抗力和生物活性.纯mg的腐蚀速率由0.11mm/y下降到0.05mm/y,mg--ca合金的腐蚀速率由0.38mm/y下降到0.32mm/y.植入动物12周后,直径的减小由0.97mm下降到0.20mm,界面新类骨质层厚度由2.56mm增加到3.14mm.
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