Zn含量对生物医用镁合金耐Hank’s模拟体液腐蚀的影响

Effect of Zinc Content on Corrosion Behavior of Biological Ternary Alloy Mg-Zn-Ca in Hank's Simulated Body Fluid

为了探讨Zn含量对Mg-Zn-Ca镁合金腐蚀性能的影响,采用熔融浇注法制备了Zn含量分别为4%,6%和8%的Mg-Zn-Ca镁合金,在37℃恒温下,以Hank’s模拟体液为腐蚀介质,研究了其腐蚀、电化学行为。结果表明:在Hank’s模拟体液中,4%Zn的镁合金腐蚀速率最小,自腐蚀电位最高;3种镁合金中,4%Zn的容抗弧最大,即耐腐蚀性能最佳。

Mg-Zn-Ca alloy samples with zinc contents of 4%,6%,and 8%(mass fraction) were prepared by molten casting.The corrosion behavior and electrochemical behavior of as-prepared Mg-Zn-Ca alloy samples with different Zn contents in Hank's simulated body fluid were examined at a constant temperature of 37 ℃,and the effect of Zn content on the corrosion behavior of Mg-Zn-Ca alloy was investigated.Result shows that Mg-Zn-Ca alloy sample with 4% Zn has the smallest corrosion rate,the highest corrosion potential,and the maximum impedance,showing the best corrosion resistance among the three kinds of tested Mg-Zn-Ca alloy samples.