Effect of Friction Stir Welding (FSW) on Corrosion Behavior of Pure Copper in 3.5 % wt NaCl Solution

In the present study, the effect of friction stir welding (FSW) on the corrosion behavior of pure copper in 3.5 % wt NaCl solution was investigated. For this purpose, pure copper was welded using a rotation speed of 355 rpm and welding speed of 20, 28, and 40 mm/min. The microstructures of the pure copper and welded pure copper were evaluated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Also, corrosion behavior of the specimens was investigated using Tafel polarization, and electrochemical impedance spectroscopy (EIS) in 3.5 % wt NaCl solution. Results revealed that FSW decreased the grain size of pure copper and improved the corrosion resistance of the stir zone.