On the chloride-induced pitting of ultra fine grains 5052 aluminum alloy produced by accumulative roll bonding process

Pitting corrosion susceptibility of ultra fine grain (UFG) 5052 aluminum alloy (AA 5052) sheets highly deformed by accumulative roll-bonding (ARB) was investigated in 3.5 wt% NaCl solution using potentiodynamic polarization, cyclic voltammetry and immersion tests. The morphology of localized attacks was analyzed by SEM-EDS. Pitting corrosion resistance of samples was diminished with increasing the number of ARB passes which is presumably due to microstructure refinement and increasing the defect density.

Research highlights► Produce ultra fine grain (UFG) 5052 aluminum alloy (AA 5052) sheet severely deformed by accumulative roll-bonding (ARB) process as a novel severe plastic deformation (SPD) process. ► Study the pitting corrosion susceptibility of these sheets in 3.5 wt% NaCl solution using potentiodynamic polarization, cyclic voltammetry and immersion tests for the first time. ► The assessments depicted that pitting corrosion resistance of samples was diminished with increasing the number of ARB passes which is presumably due to microstructure refinement and increasing the defect density.