可降解稀土镁合金模拟血管支架腐蚀研究  

Research on Corrosion of Simulate Intravascular Stent Made by Degradable Rare Earth Magnesium Alloy

作　　者：金耀华[1] 高巍[1] 王正品[1] 要玉宏[1] 石崇哲[1] 

机构地区：[1]西安工业大学材料与化工学院,陕西西安710032

出　　处：《稀土》2013年第6期31-34,共4页Chinese Rare Earths

基　　金：陕西省自然科学基金(SJ08E113);榆林市科技计划项目生物医用自降解镁合金研究

摘　　要：对经过固溶时效热处理后的Mg-RE-1.0Zr合金进行高温压缩和再结晶退火,利用失重法在人体模拟Hank溶液中进行模拟血管支架的腐蚀试验,测定腐蚀速率,分析合金的腐蚀动力学特征,并利用扫描电镜观察腐蚀后的微观形貌。试验结果表明:Mg-RE-1.0Zr合金模拟血管支架在前48 h腐蚀速度快,在168 h后试样的平均腐蚀速率趋于平稳,在0.068 mg·cm-2·h-1左右,平均腐蚀速率v与腐蚀时间t的关系符合v=0.57t-0.34规律。镁合金在Hank溶液中的腐蚀机理为点蚀。In this paper corrosion tests of Mg-RE-1.0Zr alloy simulated intravascular stent after high temperature com- pression and recrystallization annealing were conducted for different hours in Hank＇ s simulated body fluid, corrosion rates were measured by weight -loss method and corrosion kinetics were investigated as well as the corrosion morphology were ob- served by using of SEM. The results show that the corrosion speed is fast before 48 h, and after 168 h the average corrosion rates get stability around 0. 068 mg cm-2 h-1. The relation between average corrosion rate v and corrosion time t agrees with v = 0.57 t -0.34. The corrosion mechanism of Mg-RE-1.0Zr alloy is pitting corrosion in Hank＇ s simulated body fluid.

关 键 词：可降解稀土镁合金 血管支架 人体模拟Hank溶液 腐蚀 

分 类 号：TG172[金属学及工艺—金属表面处理]