Pyridinium salts as corrosion inhibitors for mild steel in acidic solution: Theoretical and experimental approaches
DOI:
https://doi.org/10.62638/ZasMat1633Abstract
New pyridinium salts, namely: 1-benzyl-4-(2-(4-nitrobenzylidene)hydrazineyl)pyridin-1-ium bromide, R1; 1-butyl-4-(2-(4-nitrobenzylidene)hydrazineyl)pyridin-1-ium bromide, R2; 4-(2-(4 nitrobenzylidene)hydrazineyl)-1-(2-oxo-2-phenylethyl)pyridin-1-ium bromide, R3 were successfully prepared as organic corrosion inhibitors for mild steel. The weight loss method was used to evaluate these salts in 1M H2SO4 which was carried out for 24 hours at room temperature. Across a variety of prepared salt concentrations, the inhibitory efficiency results for all these salts (R1-R3) as inhibitors were high. The rate of corrosion decreased with increasing inhibitor concentration, while the degree of surface coverage and inhibition efficiency increased. The physisorption process for these prepared compounds (R1, R2, and R3) was predictedby the calculated data of adsorption results. For the seorganic inhibitor salts, semi-empirical molecular orbitals level, and the molecular mechanics approach was run to exam the correlation between experimental and theoretical data. In addition, the nature of the interaction between the organic inhibitor molecular salt and the iron metal surface was obtained by performing theoretical simulations.
Keywords:
Pyridinium salts, physisorption, molecular simulation, corrosion inhibitorsReferences
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