医用可降解Zn-Cu合金的力学性能和腐蚀性能

Mechanical Properties and Corrosion of Biodegradable Zn-Cu Alloy

通过在纯锌中加入Cu元素以提高医用可降解Zn-Cu合金的力学性能,研究Cu元素含量的变化对Zn-Cu合金力学性能和耐腐蚀性能的影响。通过熔炼制备了铸态Zn-x wt.%Cu(x=0,1,1.5,2,2.5)合金,采用金相分析、拉伸试验和硬度测试分析其组织结构和力学性能,通过在SBF溶液中的电化学测试和浸泡试验研究其腐蚀降解行为。结果表明:在Cu含量为1wt.%时合金具有较好的综合力学性能,其抗拉强度为102MPa,伸长率为1.3%。Zn-Cu合金在SBF中均匀腐蚀,其腐蚀速率随着Cu含量的增加而略微增大,Zn-2.5Cu的腐蚀速率仅为0.045mm/year,远低于镁合金的腐蚀速率。

In order to exploit medical application of biodegradable Zn alloy, Cu was added into zinc to improve pure Zn mechanical properties in this study. ZnxCu(1-x)(x=0, 1%, 1.5%, 2%, 2.5%) alloy was prepared by melting. The effects of Cu content on the mechanical properties and corrosion of the Zn-Cu alloys were investigated. microstructure were observed and mechanical properties were tested by tensile and hardness testing. The corrosion behavior of the materials in simulated body fluid was determined by immersion tests and potentiodynamic measurement. The results showed that Zn-1%Cu exhibits a high comprehensive mechanical property with the strength and elongation of of 102 MPa and 1.3%, respectively. Zn-Cu alloy also presents uniform corrosion in SBF, and the corrosion rate increases with the increase of Cu content. However, the corrosion rate of the Zn-Cu alloy is slow, and is only 0.045 mm/year for Zn-2.5%Cu, significant lower than the corrosion rate of magnesium alloy.