7A52铝合金搅拌摩擦焊焊缝的电化学局部腐蚀行为  

Electrochemical Localized Corrosion Behaviour of Friction Stir Welded Seam of 7A52 Aluminum Alloy

作　　者：李奇[1] 赵军军[1] 马琳[1] 曾庆强[1] 张平[1] 

机构地区：[1]装甲兵工程学院装备再制造技术国防科技重点实验室,北京100072

出　　处：《中国表面工程》2010年第5期78-81,85,共5页China Surface Engineering

基　　金：国家自然科学基金(50801066);装备再制造技术国防科技重点实验室基金(9140C8504030809)

摘　　要：7A52铝合金搅拌摩擦焊焊缝的成分虽然与母材相同,但其经历了再结晶过程和特殊的热处理过程,粗大第二相发生的变化会导致其电化学行为发生改变。文中分析了焊缝的显微组织和粗大第二相,对母材和焊缝分别进行了电化学测试,并观察了腐蚀后的表面形貌和特征,以确定局部腐蚀形核处。研究结果表明,焊缝的电化学局部腐蚀过程与母材相似,均为Mg2Si优先阳极溶解,产生自身的点蚀坑,随着腐蚀的进行,Mg2Si周围的基体被腐蚀。而α–Al12(Fe,Mn)3Si与Al6(Mn,Fe)并未被腐蚀。Although the composition of friction stir welded(FSW) seam of 7A52 aluminium alloy is the same as base metal,it experiences recrystallization and a special heat treatment process.The change of intermetallics plays an important role in electrochemical behaviour of FSW seam.First of all,the microstructure and intermetallics of FSW seam were analysed.The electrochemistry of BM and FSW seam was measured.Morphology and properties were observed at last in order to determine nucleation.The research results indicat...

关 键 词：7A52铝合金 搅拌摩擦焊 第二相 局部腐蚀 阳极溶解 

分 类 号：TG453.9[金属学及工艺—焊接]