Synthesis and Characterization of a Novel Quaternary Ammonium Salt as a Corrosion Inhibitor for Oil-Well Acidizing Processes

A quaternary ammoniumsalt, 1,1 & PRIME;-(1,4-phenylenebis(methylene))bis(4-formylpyridin-1-ium)(PMBF), was synthesized, characterized, and investigated as an inhibitorfor C1018 (type steel in oil wells) corrosion in 17.5% HCl solution.The chemical structure of PMBF was confirmed using altered techniques.Potentiodynamic polarization (PDP) was employed to investigate thecorrosion inhibition effect of the synthesized compound in a 17.5%HCl solution for C1018. The corrosion protection was increased byimproving the dose of the synthesized compound and reached 98.5% at42.02 x 10(-5) M and 313 K. On the other hand,it was decreased by increasing the temperature and reached 97.9% atthe same concentration and 343 K. The parameters of activation andadsorption were calculated and debated. A polarization study revealedthat PMBF functioned as a mixed-kind inhibitor, i.e.,affecting both cathodic and anodic processes through their adsorptiononto the electrode surface. The adsorption was described by the Langmuiradsorption isotherm. Different techniques were employed as appropriatetools for analyzing the structure of the layer formed on C1018. Densityfunctional theory (DFT) and Monte Carlo (MC) simulations were usedto compare the results of the theoretical calculations with the experiments.Finally, an appropriate inhibition mechanism was suggested and discussed.

Automated summary

A quaternary ammonium salt, PMBF, was synthesized and investigated as an inhibitor for C1018 corrosion in 17.5% HCl solution. The chemical structure of PMBF was confirmed using altered techniques. The corrosion protection increased with increasing the dose of PMBF and reached 98.5% at 42.02 x 10(-5) M and 313 K, while it decreased with increasing temperature and reached 97.9% at the same concentration and 343 K. The adsorption of PMBF onto the electrode surface affected both cathodic and anodic processes, acting as a mixed-kind inhibitor.