AZ31B和AZ61A镁合金搅拌摩擦焊接头耐腐蚀性能研究  

Study of Corrosion Resistance of Friction Stir Welded Joint of AZ31B and AZ61A Magnesium Alloy

作　　者：张木[1] 沈长斌[2] ZHANG Mu;SHEN Changbin(School of Material Engineering,Shaanxi Polytechnic Institute,Xianyang 712100,China;School of Material Science & Engineering,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]陕西工业职业技术学院材料工程学院,陕西咸阳712000 [2]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《大连交通大学学报》2019年第4期82-85,共4页Journal of Dalian Jiaotong University

基　　金：辽宁省教育厅高等学校科研计划资助项目(L2014185)

摘　　要：对AZ31B和AZ61A两种镁合金一定工艺下搅拌摩擦焊接接头及基体进行了中性室温静态氯化钠浸泡失重实验和动电位极化曲线测试.在该工艺参数下,AZ31B镁合金接头的热影响区和焊缝24h单位面积失重率分别较母材减少0.9444和0.4556g/m^2,而AZ61A镁合金则为0.1和-0.0666g/m^2;极化曲线测得AZ31B镁合金热影响区和焊缝以及母材的腐蚀电位分别为-1.564、-1.508、-1.519V.而AZ61A镁合金则为-1.543、-1.559、-1.553V.该搅拌摩擦焊工艺可以获得耐盐水腐蚀性能高于母材的AZ31B镁合金接头.The corrosion resistance and pitting corrosion resistance of the friction stir welded joints and matrix of AZ31B and AZ61A magnesium alloy under a certain processwere investigated.It is found that the 24 h-unit-area weight loss of the AZ31B magnesium alloy joint can be reduced by 0.944 4 at the heat-affected zone(HAZ)and 0.455 6 g/m^2 at the weld.Meanwhilethe reduction of AZ61A magnesium alloy is 0.1 and-0.0666 g/m^2,respectively.The potentiodynamic polarization curve shows that the HAZ,weld of the AZ31B magnesium alloy and the corrosion potential of the base metal are-1.564,-1.508,and-1.519 V respectively.Meanwhile,the AZ61A magnesium alloys are-1.543,-1.559 and-1.553 V.It is concluded that the AZ31B magnesium alloy joint with higher saltwater corrosion resistance than the base material can be obtained by the friction stir welding process.

关 键 词：镁合金 搅拌摩擦焊 静态失重 动电位极化曲线 

分 类 号：TG457.19[金属学及工艺—焊接]