Experimental and Theoretical Study of Some N-pyridinium Salt Derivatives as Corrosion Inhibitors for Mild-steel in 1 M H2SO4

N-pyridinium salt derivatives (1), ( 2), ( 3), ( 4) and ( 5) were prepared and their inhibition effect as corrosion inhibitors for mild steel was investigated in 1 M H 2 SO 4 solution at 30 o C for 24 hs.The corrosion inhibiting action was studied using weight loss measurements.The results have revealed that the corrosion rate decreases, inhibition efficiencies increase and surface coverage degree increases with a higher inhibitor's concentration.Inhibition efficiencies for prepared N-pyridinium salt derivatives have the highest inhibiting efficiency even for a low concentration.The values of ∆G o ads are showing physisorption effect for all prepared compounds.Molecular modeling systems were achieved for the suggested inhibitors (1), ( 2), (3), ( 4) and (5).Theoretical calculations could be used as a useful tool to obtain information for explaining the mechanism and nature of interaction between the metal surface and the organic molecule as a corrosion inhibitor.