Abstract In the present research an extend investigation about the corrosion behaviour of Al–SiC nano-composite, produced by accumulative roll bonding process, has been made. Hence various tests such as polarisation and electrochemical impedance spectroscopy in 3.5 with % NaCl solution were carried out. Morphology of pits for the latest samples was studied and analysed by SEM–EDS and AFM. During the tests it was observed that, increasing the ARB cycles will be lead to decrease in number of pits and increase in pitting corrosion resistance. This fact may be due to the uniform distribution of SiC in matrix and its refinement. According to the SEM micrograph, it was observed that by increasing the ARB cycles, the SiC particle size becomes less than 100 mm.