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The electrochemical behavior of aluminium alloy AA6063 were investigated using Schiff base compounds namely N, N'-bis (Salicylidene)-1, 2-Diaminoethane(Salen) and N, N'-bis (3-Methoxy Salicylidene)-1, 2 Diaminoethane (Msalen) as corrosion inhibitors in presence of 1M Hydrochloric Acid by Potentiodynamic polarization(PDP), electrochemical impedance spectroscopy(EIS) and weight loss method. Potentiodynamic polarization study revealed that the two Schiff bases acted as mixed type inhibitors. The change in EIS parameters is indicative of adsorption of Schiff bases on aluminum alloys surface leading to formation of protective layer. The weight loss study showed that the inhibition efficiency of these compounds increases with increase in concentration and vary with solution temperature and immersion time. The thermodynamic parameters were also calculated to investigate the mechanism of corrosion inhibition. The effect of methoxy group on corrosion efficiency was observed from the results obtained between Salen and Msalen. The effectiveness of these inhibitors were in the order of Msalen>Salen. The adsorption of Schiff bases on AA6063 alloy surface in acid obeyed Langmuir adsorption isotherm. The surface characteristics of inhibited and uninhibited alloy samples were investigated by scanning electron microscopy (SEM).

Electrochemical investigation of corrosion inhibition of AA6063 alloy in 1M hydrochloric acid using Schiff base compounds