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

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.