可降解Zn-Li合金吻合钉的自然时效与降解机制研究  

Research on natural aging and degradation mechanism of degradable Zn-Li alloy staple

作　　者：董旭 耿芳 马凤仓[1] 李伟[1] 张柯[1] DONG Xu;GENG Fang;MA Fengcang;LI Wei;ZHANG Ke(School of Materials and Chemistry,University of Shanghai for Science and Technology,Shanghai 200093,China;Medtronic(Shanghai)Co.,Ltd.,Shanghai 201100,China)

机构地区：[1]上海理工大学材料与化学学院,上海200093 [2]美敦力(上海)有限公司,上海201100

出　　处：《有色金属材料与工程》2024年第3期38-45,共8页Nonferrous Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(51771119);上海市自然科学基金资助项目(17ZR1419600)。

摘　　要：作为力学性能良好,降解速率适中的可降解金属,Zn基合金的应用前景十分广阔。研究了自然时效对Zn-Li合金性能的影响以及Zn-Li合金吻合钉的体外降解机制。通过拉伸试验和电化学试验分析时效时间对Zn-Li合金丝力学性能和耐蚀性的影响。采用浸泡实验,根据吻合钉质量变化分析不同模拟液对Zn-Li吻合钉降解速率的影响,采用扫描电子显微镜分析Zn-Li吻合钉不同部位的降解模式。结果表明,时效2.0 a的Zn-Li合金丝比时效1.0 a的拉伸强度低43.86 MPa,伸长率下降24.17%,腐蚀电势由-1.07 V下降至-1.12 V,腐蚀电流密度增加13%。Zn-Li吻合钉在模拟体液中降解速率最大,钉脚的微电偶腐蚀为最严重的腐蚀形式。As biodegradable metals with good mechanical properties and moderate degradation rate,Znbased alloys have broad application prospects.The effect of natural aging on the properties of Zn-Li alloy and the in vitro degradation mechanism of Zn-Li alloy staple were studied.The effect of aging time on the mechanical properties and corrosion resistance of Zn-Li alloy wire were analyzed by tensile test and electrochemical test.Immersion test was used to analyze the effect of different simulation solutions on the degradation rate of Zn-Li alloy staple based on the weight change of the staple,and the degradation modes of different parts in Zn-Li alloy staple was analyzed by scanning electron microscope.The results show that the ultimate tensile strength of the wire aged for 2.0 a is 43.86 MPa lower than that of the wire aged for 1.0 a.The elongation decreases by 24.17%,the corrosion potential decreases from−1.07 V to−1.12 V,and the corrosion current density increases by 13%.The degradation rate of Zn-Li alloy staple is the highest in simulated body fluid,and the micro-galvanic corrosion of staple foot is the most serious corrosion type.

关 键 词：生物医用材料 吻合钉 自然时效 体外降解 生物可降解金属 

分 类 号：TG146[一般工业技术—材料科学与工程]