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Schiff Base and Its Metal Complexes as Ecofriendly Pitting Corrosion Inhibitors on ASTM-A36 Low Carbon Steel in Corrosive Oil and Gas Well Treatment Fluids

A high yield (74.63%) bidentate Schiff base ligand was synthesized from the condensation reaction of 4-aminophenol and 4-diethylamino-2-hydroxybenzaldehyde by the reflux method. Its transition metal complexes of Ni, Cu and Zn were prepared from the corresponding metal salts in methanol solution using the same procedure. The chemical structure of the synthesized Schiff base and its metal complexes was characterized by physicochemical, spectral analysis (FTIR and UV-Visible), and molar conductivity studies which revealed that the metal complexes were non electrolytic. Elemental analysis data for the Schiff base ligand and its metal complexes were used to confirm the general formula of the compound. The spectral data showed that coordination occurred through the azomethine nitrogen atom and the oxygen atom of the phenolic ring. The corrosion inhibition of Schiff base and its metal complexes was evaluated using potentiodynamic polarization (PDP), linear polarization resistance (LPR), and weight loss (WL) methods in acidic oil and gas well treatment fluid. The corrosive fluid was simulated using 1 M HCl solution. The results indicated that the compounds had a promising inhibitory effect on the corrosion of ASTM-A36 low carbon steel in the medium. The effectiveness of the inhibitors decreased with increasing time and temperature, but improved with increasing concentration of the inhibitors. The metal complexes showed a synergistic effect against Schiff base, with NiL1 having the maximum inhibition efficiency of 84.29%. The thermodynamic parameters revealed that the adsorption of the Schiff base and its complexes on the metal surface was spontaneous, endothermic and followed physical adsorption mechanism which conformed perfectly to the Langmuir adsorption isotherm. PDP measurements showed that the Schiff base and its metal complexes acted as mixed type inhibitors. The inhibition efficiency values obtained from the different techniques were comparable. SEM analyses of the corrosion product also confirmed the formation of a protective layer on the metal surface.

Corrosion Inhibition, Schiff Base Ligand, Synthesis, Characterisation

Chimezie Peter Ozoemena, Ekerete Jackson Boekom, Ekaete Jacob Abai, Essien Kufre Edet, Inemesit Asuquo Akpan. (2023). Schiff Base and Its Metal Complexes as Ecofriendly Pitting Corrosion Inhibitors on ASTM-A36 Low Carbon Steel in Corrosive Oil and Gas Well Treatment Fluids. Science Journal of Chemistry, 11(5), 168-188.

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This article is an open access article distributed under the Creative Commons Attribution License ( which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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