Experimental and theoretical study of some N-pyridinium salt derivatives as corrosion inhibitors for mild-steel in acidic media

Abstract

N-pyridinium salt derivatives (1-5) were prepared and investigated as corrosion inhibitors for mild steel in 1 M H 2 SO 4 solution at 30°C for 24 h. The corrosion inhibiting action was studied using weight loss measurements. The results demonstrated that the corrosion rate decreases, inhibition effi ciencies increase, and surface coverage degree increases with increasing inhibitor concentration. Inhibition effi ciencies for prepared N-pyridinium salt derivatives have highest inhibiting effi ciency for even low concentration. The values of ∆G°a ds showed physisorption effect for all prepared compounds. Molecular modeling systems were achieved for suggested inhibitors 1-5. 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.

Mechanism of corrosion protection in chloride solution by an apple-based green inhibitor: experimental and theoretical studies

“…The absolute value of Gibbs free energy was smaller than 20 kJ mol − 1 , which suggests that the physical adsorption is dominant, rather than chemical adsorption [72]. In this condition, the electronic structure of the adsorbate is disturbed because of the electrostatic interaction between APE molecules and the steel surface [70].…”

“…It was also responsible for converting Fe 3 O 4 in corrosion product layer to a more corrosion-resistant iron oxide (Fe 2 O 3 ). APE molecules may attach to the surface of steel though their high electron density sites [70]. The APE adsorption entails the interaction of non-bonding electrons on nitrogen and oxygen with the steel surface.…”

Synthesis and Study Behavior of Some New Pyridinium Salts as Corrosion Inhibitors for Mild Steel in 1M H2SO4

“…On the other side, toxicity and biological of pyridanium salts has well docimented because their increase applications. More specifically, pyridanium salts carrying long alkyl chains were found to be outstanding organic anticorrosion agents [10][11][12][13][14][15][16][17]. In this work, we suggested to study some new Pyridinium bromide derivatives as corrosion inhibitors for mild steel in 1M H2SO4 aqueous solution at room temperature via loss of weight measurements for 24 hours.…”

Synthesis New Pyridinium Salts as Corrosion Inhibitors for Mild Steel in 1 M H2SO4

“…Several organic derivatives have also been studied in acidic media as corrosion inhibitors for various metals and alloys [12][13][14][15][16]. We generated some pyridinium bromide salts using Schiff base compounds and N-alkylation reaction with alkyl halides in this study.…”