In this study, Cu – Ni-Al 6061, rod were joined by friction welding techniques at various mechanical characterization.Corrosion, micro, macrostructure, grain structure, scanning Electros ion Micros cope[SEM] Analysis behavior of the Explosively joined sample was investigated. The influence of grain size on pitting corrosion of 6061Al in 3.5wt NaCl solution was investigated by electrochemical methods. At the end of the corrosion test carried out according to ASTM G3- Standard no separation was observed at the interface of the joint samples. The result of corrosion test showed no sign of any distinctive separation crack, tear, in the interface. The highest corrosion rate was measured in regions next to interfaces, the optical microscope and SEM examinations revealed that the corrosion current and corrosion rates are very low for the specimens welded with low upset pressure compared to other specimens.The minimum and maximum corrosion rates vary from0.466 and 356.64 mA/ Square centimeter.