Aluminium application is increasing in different industries due to its good formability, light weight and excellent corrosion resistance caused by its protective film. 7075 aluminium alloy is widely used for aircraft industrial as result of its high strength to weight ratio, together with low density characteristics. However, it is highly prone to localized corrosion such as pitting corrosion, intergranular corrosion (IGC) and exfoliation corrosion in chloride containing solutions. Friction stir processing (FSP), a localized microstructural modification technique, which is based on the basic principles of friction stir welding (FSW) was able to moderate mechanical properties. Due to importance of corrosion behavior of this alloy, the aim of present study was to evaluate the effect of rotational speed on corrosion behavior of 7075 aluminum alloy after FSP. Therefore, three friction stir processed samples were made by employing a constant tool travel speed of 100 mm/min at rotating speeds of 630, 1000 and 1600 rpm. Microstructural analysis was conducted via x-ray diffractometry (XRD), field emission scanning electron microscope (FE-SEM) and energy dispersive X-ray spectroscopy (EDS). Microhardness profile was measured for all the samples. Corrosion behavior of all three samples was evaluated by employing common corrosion tests such as open circuit potential (OCP), tafel potentiodynamic polarization, cyclic polarization, electrochemical impedance spectroscopy (EIS), immersion, IGC and exfoliation corrosion. Except for IGC and exfoliation corrosion, all corrosion tests were carried out in 3.5% NaCl media. In order to determine the susceptibility of different zones to IGC and exfoliation corrosion, the immersion test in a NaCl + H2O2 solution and modified 20 vol.% diluted solution of 4.0 M NaCl + 0.5 M KNO3+ 0.1 M HNO3 were done, respectively. Microstructural surveys demonstrated that very fine and equiaxed grain structures were formed in the stir zones. Also, FSP at higher rotational speed resulted in an increase in the grain size, decrease in the intermetallic size and more uniform distribution of them. The microstructure of the transition zone between Thermo-mechanically affected zone (TMAZ) and the stir zone possessed recrystallized grains. However, it grains became more stretched with increasing the distance form stir zone. OCP has indicated the formation of protective film. Tafel potentiodynamic polarization and EIS tests showed that FS processed sample with 1600 rpm and base metal samples have the highest and lowest resistance to corrosion, respectively. Cyclic polarization test in 3.5% Nacl solution has demonstrated that FS processed sample with rotational speede of 1600 rpm and base metal have the best resistance to localized corrosion. Immersion test in 3.5% NaCl observation made it clear that base metal surface led to the formation of bigger and deeper pits. In contrast, the size of each pit was decreased and the number of pits was increased after FSP for higher rotational speed sample. IGC test illustrated that stir zone of all samples was subjected to a combination of IGC and pitting corrosion while no IGC was found in other zones. Furthermore, when the rotational speed was increased, the corrosion extent was decreased. Exfoliation corrosion has shown that stir zone and TMAZ of all samples were prone to IGC and pitting corrosion. Moreover, heat affected zone (HAZ) and base metal had the same corrosion behavior and have undergone sever localized corrosion. Interestingly, increase of rotational speed improved corrosion resistance of all zones. Generally, With the Increase of rotational speed, the size of intermetallics decreased and their distribution became more homoginous which led to improvement of the corrosion behavior of FS processed samples In comparison with base metal. Keywords: Friction stir processing, pitting corrosion, intergranular corrosion, rotational speed, microstructure, 7075 aluminium alloy