Adsorption behaviour,thermodynamic and electrochemical studies of chloro derivatives of N-(4-methoxybezylidene)aniline as corrosion inhibitors for zinc in hydrochloric acid

The inhibitive action of chloro derivatives of n-(4-methoxybezylidene)aniline on the corrosion of zinc in hydrochloric acid solution has been investigated by weight loss,galvanostatic polarization and electrochemical impedance spectroscopy (eis) techniques. corrosion inhibition efficiency increases with increase in inhibitors concentration and is maximum at 20.4*10-3 moll-1. thermodynamic parameters such as qads,g°ads and activation energies ( ea) were calculated. g°ads values show that studied inhibitors exhibit complex type of interaction with metal surface i.e. both physical as well as chemical adsorption. the polarization measurements indicated,mixed type of inhibition at lower concentration and cathodic at higher concentration. the adsorption of inhibitors on zinc obeyed langmuir's isotherm.