Experimental researches and statistical analysis of the corrosion behavior of rolled and heat treated 2xxx Al alloys

The material for experiments was an aluminum alloys series 2xxx obtained by thermo-mechanical processing using different parameters of artificial aging. The slab of Al alloys was rolled at 450-400o C for 7-8 hours. solution treated at 500 +/- 5o C. maintaining time 40 minutes, quenched in water and artificial aging at 100-220o C during respectively 10-240 minutes. After rolling and heat treatment the obtained alloys was corroded in solution of NaCl with 7.33-8.33 pH at room temperature and analyzed the evolution of potential of electrode depending on time in correlation of structural modification. In addition was studied the electrochemical corrosion behaviour in sodium thiosulphate solution 0.5M using a potentiostatic device. The corrosion characteristics of rolled and heat treated 2xxx Al alloys were predicted through statistical analysis of the measured pitting potential and pitting time at different parameters of aging.