Evaluating the Corrosion Behavior of Dissimilar Joints of Aluminum Alloys 6082 and 5050 to Stainless Steel 304 Produced by Friction Stir Welding

In this research, sheets of aluminum alloys 6082 and 5050 were joined to stainless steel 304 by friction stir welding. The corrosion behavior of parent metal, heat affected zone and boundary line of joints in each side of the sheets was studied in 3.5% NaCl media by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). Results showed that maximum current density belonged to the galvanic cell of the boundary lines of the joints. For the aluminum sheets, the corrosion resistance of HAZ was lower than parent metals. On the other hand the corrosion resistance of stainless steel 304 was the same in all regions.