摘要
采用粉末冶金和热压烧结的方法制备以MgO陶瓷粉末(质量分数分别为5%、10%和20%)为增强相的MgO/Mg镁基生物复合材料,并用XRD和SEM表征其显微组织结构。以纯镁金属作为对照样,分别采用失重腐蚀、动电位极化扫描和电化学阻抗谱研究不同MgO含量的镁基复合材料在模拟体液(简称SBF)中的腐蚀降解速率和腐蚀行为。结果表明:MgO/Mg镁基复合材料与纯镁金属具有相同的腐蚀机制,MgO在镁基体中的均匀、连续分布,可以提高镁基复合材料整体的耐腐蚀性能,其耐蚀性随着MgO含量的增加而改善,20%MgO/Mg复合材料表现出最好的耐腐蚀性能。
The MgO/Mg biocomposite materials containing 5%,10% and 20%（mass fraction） MgO as reinforcement phase were fabricated by powder metallurgy and hot press sintering process.Pure Mg specimen was made following the same procedure and used as control experiment.Their microstructures were characterized by XRD and SEM.The corrosion biodegradable properties of MgO/Mg biocomposite materials with different MgO contents were studied in the simulated body fluid（SBF） by weight loss test and electrochemical measurements including potentiodynamic polarization and electrochemical impedance spectra（EIS）.The results show that the MgO/Mg composite materials share the same corrosion mechanism with pure Mg metal.The uniform and consecutive dispersion of MgO in Mg matrix plays an important role in the improvement of corrosion resistance of composite materials.The corrosion resistance increases with the increase of MgO addition.The MgO/Mg composite material with 20% MgO exhibits the best enhanced corrosion resistance.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2011年第11期2792-2798,共7页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金委员会创新研究群体基金资助项目(50721003)
中南大学粉末冶金国家重点实验室开放基金资助项目
关键词
镁基金属复合材料
粉末冶金
耐蚀性
极化曲线
电化学阻抗谱
Mg-based metal matrix composites
powder metallurgy
corrosion resistance
polarization curve
electrochemical impedance spectra
