PITTING BY CORROSION IN ALUMINUM AND AL-6201 ALLOY

The susceptibility of pure aluminum and aluminum 6201 alloy to pitting was investigated in sodium chloride solutions through determination o f the corrosion, repassivation and pitting potentials. Potentiodynamic polarization including scratching techniques were employed being also determined the type and relative amount of corrosion damage to the me tals. The morphology of the attack was determined using scanning elect ron microscopy (SEM). The results showed a similar performance for alu minum 6201 alloy and aluminum. It was also observed that an increase i n chloride concentration resulted in a decrease in the corrosion, pitt ing and repassivation potentials of both materials.