The inhibitive influence of salicylideneaniline (a Schiff base) on the corrosion of aluminium in 1.0 N sodium hydroxide was studied by weight loss, potentiodynamic polarisation and electrochemical impedance measurements. The inhibition efficiency of the compound increases with its increasing concentration. The addition of tetrabutylammonium bromide, TBAB (0.0006 M ) to varying concentrations of the Schiff base enhanced the inhibition efficiency at each concentration of the Schiff base. The results obtained from mass loss data, polarisation and EIS measurements showed similar trend. The surface coverage, θ, values from mass loss data were fitted to kinetic/thermodynamic modal of El-Awady et al., Langmuir and Temkin adsorption isotherms. The best fit isotherm was the isotherm of El-Awady et al. The values of Ea , Qads and .Δ°ads revealed that the compound inhibits corrosion through physisorption. The polarization studies indicated that the corrosion of aluminium in 1.0 N NaOH was predominantly under anodic control, in the presence as well as in the absence of the inhibitor and the inhibition is of mixed type.
