Mg-3Gd-1Zn合金在模拟体液中的腐蚀与磨损协同作用

Synergistic Effects of Corrosion and Wear Resistance of Mg-3Gd-1Zn Alloy in Simulated Body Fluid

对Mg-3Gd-1Zn(质量分数,%)生物镁合金进行了不同温度的固溶处理,然后进行时效处理。采用失重法测试了合金的腐蚀性能;利用摩擦磨损试验机评价了合金在模拟体液(SBF)中的摩擦磨损行为,将腐蚀与磨损各自导致的质量损失定量分开,并与单一SBF条件下的腐蚀速率和干摩擦条件下的磨损率进行对比。结果表明:随着固溶温度的升高,共晶相逐渐减少,晶粒尺寸增大,合金的硬度逐渐增大,腐蚀速率先降低后有所升高。合金在SBF中的摩擦系数为干摩擦条件下的33%~55%,体积磨损率仅为干摩擦条件下的1.3%~1.5%。磨损明显加速腐蚀的发生,不同状态合金在伴有摩擦磨损的SBF中的腐蚀速率是单纯在SBF中浸泡腐蚀速率的11~19倍。在SBF中,摩擦磨损加速了合金的腐蚀,而SBF介质有效抑制了合金的磨损。

The Mg-3Gd-1Zn alloy was performed by solution treated at different temperatures and then aged.The corrosion behavior of alloys was tested by mass loss,the friction and wear properties in simulated body fluid(SBF)were evaluated by friction and wear tester,and the mass loss caused by corrosion and wear was quantitatively evaluated.The corrosion rate of the alloy in SBF accompanied with wear was compared with that without wear,and the wear behavior of the alloy in SBF was also compared with that under dry sliding condition.The results showed that the eutectic phase decreased,the grain size increased,the hardness increased slightly,and the corrosion rate decreased first and then increased with the increase of solution temperature.The friction coefficient in SBF with wear was about 33%-55%of that under dry sliding condition.The wear rate in SBF was 1.3%-1.5%of that under dry sliding condition.The wear would obviously accelerate the corrosion rate.The corrosion rate of alloy in SBF with wear under different conditions was 11-19 times of that without wear.In general,the corrosion rate was increased significantly due to wear,and wear was obviously impeded by SBF.