Effect of Chloride Ions Concentration on the Semiconducting Behaviors of 1050 and 6061 Al Alloys

The effect of chloride ions concentration on the semiconducting behaviors of 1050and 6061 al alloys in 0.003 m naoh has been investigated by using potentiodynamicpolarization, cyclic potentiodynamic polarization and mott-schottky analysis.potentiodynamic and cyclic potentiodynamic polarization curves indicate that chloride ionsconcentration narrowed passivation region for both al alloys. also, these polarization curvesrevealed that increasing chloride ions concentration leads to decrease the pitting potential ofboth al alloys. mott–schottky analysis demonstrated that the passive films formed on bothal alloys in 0.003 m naoh with and without nacl addition show n-type semiconductingbehaviors in nature. for both alloys, the passive films formed in chloride-free solution aremost stable, and that formed in chloride-containing solution are unstable. also, the mott–schottky results showed that the donor density evaluated from the mott–schottky plotsincreases with increasing chloride ions concentration