| 董旭,耿芳,马凤仓,李伟,张柯.可降解Zn-Li合金吻合钉的自然时效与降解机制研究[J].有色金属材料与工程,2024,45(3):38-45. |
| 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 |
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| DOI：10.13258/j.cnki.nmme.20230504001 |
| 中文关键词: 生物医用材料 吻合钉 自然时效 体外降解 生物可降解金属 |
| 英文关键词:biomedical materials surgical staple natural aging in vitro degradation biodegradable metals |
| 基金项目: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） |
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| 中文摘要: |
| 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。 |
| 英文摘要: |
| As biodegradable metals with good mechanical properties and moderate degradation rate, Zn-based 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. |
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