A series of new heterocyclic polyamides, containing symmetrical 1, 3, 4-oxadiazole rings, was synthesized by condensation of bis (4-amino phenyl)-1,3,4-oxadiazole with aliphatic and aromatic dicarboxylic acids. The efficiency of the polymers has been studied for corrosion inhibition of mild steel in 1MH2SO4 by weight loss, polarization technique, electrochemical impedance spectroscopy and scanning electron microscopy. The results showed that the inhibition efficiency increases with increase in concentration and decreases with increase in temperature. The inhibition efficiency has been synergistically enhanced by the addition of halide ions and the thermodynamic parameter ∆G0 and kinetic parameter Ea have also been calculated. The adsorption of these compounds was found to obey Langmuir adsorption isotherm. The percentage of iron in the corrodent solution was determined by atomic absorption spectroscopy. The surface morphology of the mild steel specimens was evaluated using SEM images.
