Novel biphenylidene-thiopyrimidine derivatives as corrosion inhibitors for carbon-steel in oilfield produced water

Hajar A Ali; Mahmoud M Shaban; Ashraf S Abousalem; Eslam A Ghaith; Abdelaziz S Fouda; Mohamed A Ismail

doi:10.1038/s41598-023-43312-6

Novel biphenylidene-thiopyrimidine derivatives as corrosion inhibitors for carbon-steel in oilfield produced water

Sci Rep. 2023 Sep 29;13(1):16388. doi: 10.1038/s41598-023-43312-6.

Authors

Hajar A Ali¹, Mahmoud M Shaban², Ashraf S Abousalem^{3

4}, Eslam A Ghaith¹, Abdelaziz S Fouda¹, Mohamed A Ismail⁵

Affiliations

¹ Chemistry Department, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt.
² Egyptian Petroleum Research Institute, Nasr City 11727, Cairo, Egypt. mahmoud_shaban26@yahoo.com.
³ Chemistry Department, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt. ashraf.abousalem@gmail.com.
⁴ Quality Control Laboratory, Operations Department, Jotun, Egypt. ashraf.abousalem@gmail.com.
⁵ Chemistry Department, Faculty of Science, Mansoura University, Mansoura, 35516, Egypt. mismail@mans.edu.eg.

Abstract

The inhibiting efficiency of three newly synthesized organic compounds:5-((4'-(dimethylamino)-[1,1'-biphenyl]-4-yl)methylene)-1,3-diethyl-2-thioxodihydropyrimidine-4,6(1H,5H)-dione (HM-1228), 5-((4'-(dimethylamino)-[1,1'-biphenyl]-4-yl)methylene)-2-thioxodihydropyrimidine-4,6(1H,5H)-dione (HM-1227) and 5-((4'-(dimethylamino)-[1,1'-biphenyl]-4-yl)methylene)pyrimidine-2,4,6(1H,3H,5H)-trione (HM-1226) in oilfield produced water on the corrosion of carbon steel has been examined via electrochemical measurements; potentiodynamic polarization (PDP) and electrochemical impedance (EIS) techniques. The adsorption of these compounds on the surface of carbon steel followed Langmuir isotherm. In addition, the surface morphology of uninhibited and inhibited carbon steel was examined by Atomic Force Microscopy (AFM), observing surface improvement when carbon steel samples exposed to the inhibited corrosive solutions. The average surface roughness (Ra) in oilfield produced water solution in the presence of 0.5 mM of HM-1228 inhibitor was 138.28 nm compared to the uninhibited surface 571.62 nm. To explore the corrosion inhibition mechanism, quantum chemical calculations and Monte Carlo simulations were utilized. The HM-1228 inhibitor demonstrated the highest corrosion inhibition efficiency at 94.8% by PDP measurements. The higher corrosion inhibition of compound HM-1228 can be attributed to the presence of di-N-ethyl groups that enhance both electron donating ability and lipophilic properties.