夏玉冰,张丽,吴丰,汪荣香,章晓波

• 1:南京工程学院材料科学与工程学院
• 2:江苏省先进结构材料与应用技术重点实验室

摘要(Abstract)：

采用光学显微镜、扫描电镜等研究了经不同温度固溶及时效处理后Mg-9Gd-1Zn-0.2Ca合金的显微组织,利用质量损失法、析氢法和电化学法测试了热处理后合金在模拟体液中的腐蚀性能。结果表明:经过固溶与时效处理之后,合金组织呈树枝状,在晶界或晶粒内部观察到层片状长周期堆垛有序(LPSO)结构;随着固溶温度的升高,共晶相逐渐减少,而晶粒内逐渐析出块状的析出相。由质量损失法和析氢法可知,随着固溶温度的增加,合金的腐蚀速率先增加后降低;固溶温度分别为370、420、470和520℃的合金的腐蚀电流密度分别为3.18×10~(-4)、5.89×10~(-4)、2.91×10~(-4)和2.74×10~(-4) A·cm~(-2),与浸泡法得到的趋势一致。不同温度固溶处理的合金在模拟体液(SBF)中的腐蚀速率从高到低的顺序为:420℃>370℃>470℃>520℃,均低于铸态合金的腐蚀速率,且520℃固溶处理的合金的腐蚀速率最小,约为铸态合金腐蚀速率的1/10,表明T6处理可显著提高合金的耐蚀性能。

关键词(KeyWords)： 生物医用镁合金;模拟体液;热处理;腐蚀性能

Abstract:

Keywords:

基金项目(Foundation): 江苏高校自然科学研究重大项目(18KJA430008);; 江苏省大学生创新创业训练计划项目(201911276032Y)

作者(Author): 夏玉冰,张丽,吴丰,汪荣香,章晓波

DOI: 10.13289/j.issn.1009-6264.2020-0056

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