铝合金双丝MIG焊焊接接头组织与耐腐蚀性能  

Microstructures and corrosion-resistant performance of Al twin wire MIG welded joint

作　　者：阮野[1] 邱小明[1] 宫文彪[2] 赵世航[1] 孙大千[1] 

机构地区：[1]吉林大学材料科学与工程学院,长春130025 [2]长春工业大学材料科学与工程学院,长春130012

出　　处：《焊接学报》2011年第2期109-112,118,共4页Transactions of The China Welding Institution

基　　金：吉林省科技发展基金资助项目(20070309);长春市科技基金资助项目(09YJ10)

摘　　要：采用扫描电镜、X射线衍射和电化学分析仪等测试方法研究了6082-T6铝合金双丝MIG焊焊接接头的组织及其耐腐蚀性能.结果表明,6082-T6铝合金双丝MIG焊接头组织主要由α-Al,少量的α-Al+Mg2Si共晶和Mg2Si组成,其中Mg2Si主要分布于晶界;对焊缝与母材的动电位极化曲线与盐雾腐蚀后的腐蚀形貌分析表明,6082-T6铝合金双丝MIG焊焊缝的耐腐蚀性低于母材,Mg2Si相的大量析出降低了焊缝的耐腐蚀性.Microstructures and corrosion-resistant performance of 6082-T6 Al twin wire MIG welded joint are studied by SEM and XRD technology.Experiments show that the welded seam is composed of a lot of α-Al,α-Al+Mg2Si and a few Mg2Si;moreover,Mg2Si largely presents in the grain boundary.Corrosion-resistant performance is studied by measuring the potentiodynamic polarization curves and corrosion surface morphologies of twin wire MIG welded joint,and the results show that corrosion-resistant performance of the matrix is better than that of the weld seam,and precipitated Mg2Si decreases the corrosion-resistant performance of the weld seam.

关 键 词：6082-T6铝合金 双丝熔化极惰性气体保护焊 组织 腐蚀 

分 类 号：TG406[金属学及工艺—焊接]