流动人工体液中冠状动脉支架用奥氏体不锈钢的电化学机理研究  

Study on Electrochemical Mechanism of Coronary Stent Used Austenitic Stainless Steel in Flowing Artificial Body Fluid

作　　者：梁成浩[1] 郭亮[1] 陈婉[1] 王华[1] 

机构地区：[1]大连理工大学化工学院,大连116012

出　　处：《生物医学工程学杂志》2005年第4期730-733,共4页Journal of Biomedical Engineering

基　　金：辽宁省自然科学基金资助项目(972210)

摘　　要：采用电化学测试技术在动态循环人工模拟体液中对冠状动脉支架用SUS316L和SUS317不锈钢的电化学机理进行研究。结果表明,流动环境降低了不锈钢的点蚀电位Eb值,提高了点蚀敏感性,促进了阳极活性溶解,但对再钝化电位Ep值影响不大。流动对奥氏体不锈钢试样的阴极极化行为有着显著影响,介质流动使氧到达电极表面的传质控制层减薄,加速氧的传质,增大阴极极化电流密度,并随流速的提高阴极吸氧反应加快。The electrochemical mechanism of austenitic stainless steel （SUS316L and SUS317L） coronary stents in flowing artificial body fluid has been investigated with electrochemical technologies. The results indicated that the flowing medium coursed the samples＇ pitting potential Eb shift negatively, increased the pitting corrosion sensitivity, accelerated its anodic dissolution, but had little effects on repassivated potential. The flowing environment had great effects on cathodic process. The oxygen reaction on the samples＇ surface became faster as the cathodic process was not controlled by oxygen diffusion but by mixed diffusion and electrochemical process. With the increase of velocity of solution, the pitting corrosion becomes liable to occur under this circumstance.

关 键 词：流动 冠状动脉支架 不锈钢 电化学机理 奥氏体不锈钢 机理研究 人工体液 人工模拟体液 电化学测试 氧反应 

分 类 号：R318.0[医药卫生—生物医学工程]