In this project corrosion behavior of nanostructured 5083 aluminium alloy produced by accumulative roll bonding (ARB) was studied. potentiodynamic Polarization tests and electrochemical impedance spectrometry were used to evaluate uniform corrosion and ASTM G67 immersion test was applied to evaluate intergranular corrosion . To this end, ARB process was successfully performed up to 6 cycles on 5083 aluminum sheet. In early stages of ARB process, main grains were isolated by boundaries resulted from transformation and, then, a layered structure composed of boundaries parallel to the rolling direction was created by increasing ARB cycle. In higher cycles, distance between layer boundaries was decreased and finally by increasing strain up to cycle 4, a structure made up of grains with nanograin size was obtained as a result of occurrence of in-situ recrystallization. By increasing the number of passes in ARB process, current density of uniform corrosion was increased. This increase in current density of corrosion is attributed to increase in high - angle grain boundaries. Also it was concluded that 5083 aluminum alloy annealed at 413 ? C and ARB samples were not sensitive to intergranular corrosion. Key words: 5083 aluminum, Corrosion behavior, Accumulative roll bonding, Ultrafine grain structures