Abstract

SHIHAB, Mehdi S.  and  MAHMOOD, Atheer F.. Experimental and Theoretical Study of Some Npyridinium Salt Derivatives as Corrosion Inhibitors for Mild-steel in 1 M H2SO4. Port. Electrochim. Acta [online]. 2017, vol.35, n.1, pp.39-51. ISSN 0872-1904.  https://doi.org/10.4152/pea.201701039.

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 H2SO4 solution at 30 °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 ΔG⁰_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.

Keywords : corrosion inhibitor; inhibition efficiencies; physisorption; molecular modeling.

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