王建利,裴娟,袁姣娜,朱美玲,杨忠,李建平

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

摘要(Abstract)：

采用金属模铸造法制备Mg-4.5Zn-xSn(x=0,1,2,3,4,mass%)合金。利用X-射线衍射仪、扫描电镜、电化学方法和浸泡实验研究Sn元素含量对Mg-4.5Zn合金显微组织和耐蚀性能的影响。结果表明:Mg-4.5Zn合金组织由α-Mg和粗大的(α-Mg+Mg_7Zn_3)共晶体组成;加入2 mass%Sn时合金中生成了少量的Mg_2Sn相,(α-Mg+Mg_7Zn_3)共晶体变为球状,弥散分布在枝晶界上;当Sn含量超过2 mass%时,随着Sn含量的增加Mg2Sn相数量增多、并长大粗化,部分(α-Mg+Mg_7Zn_3)共晶体转变为三角形状;合金耐蚀性能随Sn含量的增加先变好后变差,Mg-4.5Zn-2Sn合金耐腐蚀性能最好,具有最小的自腐蚀电流密度(149μA·cm~(-2))以及最大的电荷转移电阻(100.3Ω·cm-2)和腐蚀膜层扩散电阻(33.88Ω·cm~(-2))。

关键词(KeyWords)： Mg-Zn-Sn镁合金;显微组织;腐蚀性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51201120);; 陕西省教育厅重点实验室项目(17JS053);; 陕西省科技统筹创新工程计划项目(2016KTZDGY-04-01)

作者(Author): 王建利,裴娟,袁姣娜,朱美玲,杨忠,李建平

DOI: 10.13289/j.issn.1009-6264.2018-0028

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