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Alireza Rahimi,Abdolreza Farhadian,Lei Guo,Esmaeil Akbarinezhad,Ruhollah Sharifi,Danial Iravani,Ali Asghar Javidparvar,Mohamed A. Deyab,Mikhail A. Varfolomeev 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.123 No.-
Sunflower oil was used as environmentally friendly source to develop novel self-catalyzed waterbornepolyurethanes (WPUs) as efficient corrosion inhibitors for sour oilfield solution. A comprehensive experimentaland computational analysis was performed to evaluate the inhibition effect of WPUs. The resultsof electrochemical measurements indicated that 200 lM of WPUs were effectively protected mild steelfrom sour corrosion by 95% and 94.6% at 25 C and 60 C, respectively. Furthermore, it was found thatthe best inhibition efficiency was provided by WPU when pyrrolidine was included in its structure, particularlyat 60 C. Additionally, a smoother steel surface was observed in the presence of WPUs, indicatingthe adsorption of the polyurethane molecules on the metal surface. The results of X-ray photoelectronspectroscopy further confirmed the chemical adsorption of WPUs on the surface of mild steel. Moreover, scanning Kelvin probe microscopy revealed that the potential distribution of the steel surfacewas shifted to the negative values, which show the adsorption of the inhibitor on the surface and inhibitionof the corrosion process. Besides, high values of adsorption energy were achieved for WPUs usingmolecular dynamic simulation, indicating their spontaneous adsorption to the Fe (110) surface. The maximumadsorption energy of 794.9 kcal/mol was obtained for WPU3, which is consistent with experimentaldata. These results show that sunflower oil can be considered a potential source to developself-catalyzed polyurethanes under mild conditions as effective corrosion inhibitors for sourenvironment.
Alireza Rahimi,Majid Abdouss,Abdolreza Farhadian,Lei Guo,Savas Kaya,Jaber Neshati 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
A novel thermally stable inhibitor was developed based on citric acid and glucose (CAGCI) to inhibit thecorrosion of mild steel (MS) in simulated acidic oilfield water for oil well acidizing. All electrochemicalmeasurements were performed in a temperature range of 293–363 K to evaluate the inhibition powerof CAGCI. The results of electrochemical tests clearly revealed that CAGCI effectively inhibited MS corrosionvia a mixed-type mechanism and 77 104 M of the inhibitor provided the highest inhibition efficiencyof 90%, 93.6%, 93.7%, and 89.9% at 293 K, 313 K, 333 K, and 363 K, respectively. In addition, CAGCIprovided a total polarization resistance of 416.7 O cm2 for MS at 293 K and decreased the corrosion rate ofthe metal 7.6 times compared to blank at 363 K. Moreover, the UV–visible results demonstrated the formationof the Fe2+-CAGCI complex and the results of the surface analysis confirmed the presence of a protectivefilm of CAGCI molecules on the MS surface. Finally, the experimental outcomes were wellcomplemented by results obtained from density-functional study and molecular dynamics (MD) simulation. According to quantum calculations, citric acid and aromatic rings in the structure of CAGCI playedthe main role in electron exchanges with the MS surface. The results of the MD simulation were also confirmedthat a hydrophobic barrier can be formed by CAGCI molecules on the MS surface with a paralleladsorption configuration.