Abstract
In this study, manufacturing of Ti-5Al and Ti-5Al-5Cu alloys were accomplished employing mechanical alloying technique. The corrosion resistance in 3.5 wt% NaCl solution of Ti-5Al and Ti-5Al-5Cu alloys was investigated using cyclic polarization (CPP), electrochemical impedance spectroscopy (EIS) and chronoamperometric current-time measurements. The corroded surfaces of Ti-5Al and Ti-5Al-5Cu were examined by the use of a scanning electron microscopy and energy dispersive X-ray spectroscopy. It is found that Ti-5Al suffers both uniform and pitting corrosion, particularly with prolonging the time of exposure period in the chloride solution. While, the addition of Cu, Ti-5Al-5Cu alloy, increases the intensity of uniform corrosion and decreases the probability of pitting attack. Prolonging the immersion time to 48 h before measurement decreases the corrosion of Ti-5Al alloy, while increases the corrosion of Ti-5Al-5Cu.