朱美玲,王建利,裴娟,杨忠,郭永春,李建平

• 1:西安工业大学材料与化工学院
• 2:陕西省光电功能材料与器件重点实验室
• 3:陕西省镁铝轻合金复合材料工程研究中心

摘要(Abstract)：

利用真空电磁感应熔炼和铜模铸造法分别制备了直径ϕ=20 mm和ϕ=2 mm的Mg_(70-x)Zn_(20+x)Ca_(10)(x=0,5,10,15,20,at%)合金棒材试样,采用XRD、DSC和电化学方法研究了合金的相组成、非晶形成能力以及在模拟体液中的腐蚀性能。结果表明:直径ϕ=20 mm的Mg_(70-x)Zn_(20+x)Ca_(10)(x=0,5,10,15,20,at%)合金棒材试样均由Mg、Ca_2Mg_6Zn_3和Mg_2Zn_(11)相组成;快速冷却得到的ϕ=2 mm棒材试样中,Mg_(65)Zn_(25)Ca_(10)、Mg_(60)Zn_(30)Ca_(10)和Mg_(55)Zn_(35)Ca_(10)合金组织为完全非晶,其中Mg_(55)Zn_(35)Ca_(10)合金的非晶形成能力最强,具有最大的过冷液相区(ΔT_x=29.97 K)和γ(0.4001)。电化学腐蚀测试结果表明,随Zn含量的增加,两种直径的合金棒材试样的腐蚀电位均逐渐增大,而腐蚀电流密度不断减小,即合金的耐蚀性不断增强;与同成分的ϕ=20 mm棒材相比,ϕ=2 mm棒材具有更加优异的耐蚀性,其中直径ϕ=2 mm的Mg_(55)Zn_(35)Ca_(10)(at%)合金棒材试样的耐蚀性最好,腐蚀电位为-1.297 V,腐蚀电流密度最小为1.93μA·cm~(-2)。

关键词(KeyWords)： 生物医用材料;Mg-Zn-Ca合金;非晶形成能力;耐蚀性能

Abstract:

Keywords:

基金项目(Foundation): 陕西省科技统筹创新工程计划项目(2016KTZDGY-04-01);; 陕西省教育厅重点实验室项目(17JS053);; 陕西省科技厅自然科学基础研究项目(2018JM5070)

作者(Author): 朱美玲,王建利,裴娟,杨忠,郭永春,李建平

DOI: 10.13289/j.issn.1009-6264.2018-0402

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