Mg-Zn-Ca合金在Hank’s模拟体液中的腐蚀行为研究

Study on the corrosion rule of Mg-Zn-Ca alloy in Hank's simulated body fluid

采用溶剂保护法制备了Ca的质量分数分别为1%,2%和3%的Mg-Zn(w(Zn)=6%)-Ca合金,通过腐蚀浸泡实验腐蚀率的测定和电化学测试等方法对3种镁合金在Hank’s模拟体液中的腐蚀行为进行了研究.实验结果表明,在Hank’s模拟体液中,Ca的质量分数为1%的Mg-Zn(w(Zn)=6%)-Ca合金腐蚀速率最小;电化学测试结果显示,Ca的质量分数为1%的Mg-Zn(w(Zn)=6%)-Ca合金极化电阻最大且极化电流密度最小,说明Ca的质量分数为1%的Mg-Zn(w(Zn)=6%)-Ca合金表现出了良好的抗腐蚀性能.

Three kinds of degradable ternary Mg-Zn（ w （Zn） =6% ）-Ca alloys with Ca contents of 1%, 2% and 3% ,were fabricated by melting and casting. The mass-loss measurement and electrochemical corrosion technique were employed to study their corrosion behaviors in Hank＇ s simulated body fluid. The results show that the alloy corrosion rate of Mg-Zn（ w （Zn） =6% ）-Ca（ w （Ca） = 1% ） is the slowest. Electrochemical test results show that the alloy polarization resistance of Mg-Zn（ w （Zn） = 6% ） -Ca（ w （Ca） = 1% ） is the highest but its polarization current density is the lowest. Thus, the ternary alloy with 1% Ca presents an enhanced corrosion resistance.