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.
作者
董旭
耿芳
马凤仓
李伟
张柯
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)
出处
《有色金属材料与工程》
CAS
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)。
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
biomedical materials
surgical staple
natural aging
in vitro degradation
biodegradable metals
