窦志伟,郭锋,康裕,闫晨曦,蔡会生

• 1:内蒙古工业大学材料科学与工程学院
• 2:内蒙古自治区薄膜与涂层重点实验室

摘要(Abstract)：

分析了Gd、Y元素含量对Mg-Gd-Y-Zr(GWK)合金铸态微观组织和腐蚀性能的影响，并研究了合金的腐蚀行为及其与组织的关联性。结果表明：合金的组织主要由α-Mg固溶体和位于晶界的Mg_5(Gd, Y)化合物组成，α-Mg包括晶内初生α-Mg和晶界附近的共晶α-Mg两部分，共晶α-Mg中含有更高含量的Gd、Y元素。Mg_5(Gd, Y)与共晶α-Mg构成主要的腐蚀微电偶，Mg_5(Gd, Y)作为阳极被优先腐蚀并沿晶界向内部发展，合金由此发生腐蚀并在腐蚀初期形成晶间腐蚀的形貌特征。随着Gd、Y元素含量的增加，Mg_5(Gd, Y)化合物的数量增多，共晶α-Mg的腐蚀电位正移，导致腐蚀微电偶的电极面积和电动势相应增大，合金的电偶腐蚀程度加剧，耐腐蚀性降低。

关键词(KeyWords)： GWK镁合金;Gd、Y元素含量;微观组织;微电偶腐蚀

Abstract:

Keywords:

基金项目(Foundation): 内蒙古自治区科技项目(2020GG0318)

作者(Author): 窦志伟,郭锋,康裕,闫晨曦,蔡会生

DOI: 10.13289/j.issn.1009-6264.2023-0595

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