Thermomechanical treatments effect on corrosion behaviour of aluminium-magnesium alloy AA5083-H321

In this paper the process of the corrosion of the alloy 5083-H321 has been studied in 3% weight NaCl solution. We were interested in the effect of change in the physical state and chemical composition of the intermetallic particles on corrosion behavior of aluminum 5083-H321 alloy having undergone an annealing of 1h 30 min at 420°C, and having undergone the same annealing followed by various types of thermo-mechanical treatments. The results obtained show that the density of the intermetallic particles increases by 10 times and micropores are formed after the deformation by cold rolling. The distribution law of intermetallic particles changes after cold rolling. The morphology of corrosion changes also. The introduction of an intermediate annealing process during cold rolling of 1h at 250°C causes a recrystallization in the alloy but does not bring change on the corrosion morphology.