6061-T6铝合金焊接接头在3.5%NaCl溶液中的腐蚀行为  

Corrosion behavior of 6061-T6 aluminum alloy welding joint in 3.5%NaCl solution

作　　者：邵燕静 SHAO Yanjing(CISRI Boyuan Publishing Co.,Ltd.,Beijing 100081,China)

机构地区：[1]北京钢研柏苑出版有限责任公司,北京100081

出　　处：《物理测试》2024年第3期12-18,共7页Physics Examination and Testing

摘　　要：对不同工艺条件下的激光+GMAW复合焊铝合金焊接接头,采用3.5%NaCl溶液浸泡试验,结合扫描电子显微镜(SEM)、X射线能谱分析(EDS)、X射线衍射仪(XRD)等对其腐蚀行为进行研究。结果表明:6061-T6铝合金的微观组织中晶粒沿着轧制方向伸长。其中在晶粒内部,弥散分布的黑色小块物质和点状物是6061-T6的主要增强相—Mg2Si相,浅色部分为α-Al基体,少量的较大块黑色颗粒是Al-Fe-Si相,在晶界位置有少量析出相。6061-T6在3.5%NaCl溶液中的腐蚀过程分为点蚀诱导期、点蚀发展期和腐蚀产物膜生长阶段,体系由高频容抗—低频感抗体系转变为高频容抗—低频Warburg阻抗体系。The corrosion behavior of 6061-T6 aluminum alloy laser-CMAW composite welding joint in 3.5%NaCl solution was studied using the scanning electron microscope(SEM),the energy dispersive scanning(EDS)and X-ray diffraction(XRD).The results showed that the grains in the microstructure of 6061-T6 aluminum alloy elongated along the rolling direction.The small black blocks and dots with dispersed distribution inside of the grains were the main reinforcing phase of the 6061-T6 alloy,i.e.,Mg,Si phase.The part with light color was α-Al matrix.Few larger black particles were the Al-Fe-Si phases,and there were few precipitated phases at the grain boundaries.The corrosion process of 6061-T6 in 3.5%NaCl solution could be divided into three stages,i.e.,the piting induction stage,the ptting development stage,and the corrosion product film growth stage.It had been transformed from a high-frequency capacitive reactance-low-frequency inductive reactance system to a high-frequency capacitive reactance-low-frequency Warburg impedance system.

关 键 词：6061-T6铝合金 焊接接头 腐蚀 电化学 

分 类 号：TG407[金属学及工艺—焊接] TG172