马莹,郭阳,张忠明,徐春杰,吕振林

• 1:西安理工大学材料科学与工程学院
• 2:陕西省电工材料与熔(浸)渗技术重点实验室
• 3:西安航空学院机械工程系

摘要(Abstract)：

为开发生物医用镁合金,利用高纯原材料,在氩气气氛保护下熔炼浇铸制备了Ca合金化的Mg-4Zn合金(Ca含量分别为0.4%和1.0%,质量分数)。通过OM、SEM以及XRD分析了合金的微观组织和相组成,采用析氢法、腐蚀质量损失法以及电化学法测试了合金在Hanks模拟体液中的腐蚀行为。结果表明,合金由初生Mg固溶体和共晶体组成;随Ca含量增加,合金的电荷传递电阻减小,自腐蚀电位下降,自腐蚀电流密度增加;析氢法和腐蚀质量损失法均表明合金的腐蚀速率随时间延长而减小。共晶体对合金的耐蚀性有影响;当Ca含量从0.4%增加到1.0%时,共晶体含量增加,促进了合金的电偶腐蚀,合金耐蚀性降低。Mg-4Zn-(0.4,1)Ca合金的腐蚀形式主要为晶间腐蚀和点蚀。

关键词(KeyWords)： 镁合金;腐蚀;组织;电化学性能

Abstract:

Keywords:

基金项目(Foundation): 陕西省科技计划项目(2010K10-08);; 陕西省教育厅科学研究计划项目(2013JK0906);; 陕西省重点学科建设专项资金(陕财办教2008-171)

作者(Author): 马莹,郭阳,张忠明,徐春杰,吕振林

DOI: 10.13289/j.issn.1009-6264.2015.01.014

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