Inhibition effect of vanillideneanthranilic acid on the corrosion of aluminium in 1.0 N NaOH

The inhibition effect of vanillideneanthranilic acid on the corrosion behaviour of commercial aluminium in 1.0 N NaOH as corrosion medium was investigated by mass loss , potentiodynamic polarisation and electrochemical impedance measurement methods and SEM technique . It was concluded that the inhibition efficiency increased with the increasing concentration of the inhibitor. The maximum inhibition efficiency was found to be 59.25% at 30° . The investigation of adsorption isotherms indicate that the inhibitor fit Langmuir and Temkin isotherms, fairly well. The phenomenon of physisorption is attributed to the values of Ea, Qads and Δ° . The potentiodynamic polarisation results reveal that the inhibitor act as a mixed type inhibitor

Author(s): 1T. Umasankareswari and 2T. Jeyaraj

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