Sour corrosion of C1018 carbon steel and its inhibition by 1–benzylimidazole: electrochemical, SEM, FTIR and computational assessment
Source abstract
Abstract
The sour corrosion of C1018 carbon steel in CO2-saturated 3.5% NaCl + 100 ppm H2S solution and its inhibition by a low-toxic molecule, 1–benzylimidazole (1–Benz), has been investigated. Electrochemical impedance spectroscopy (EIS) results reveal that 1–Benz can form a strongly-adsorbed and highly protective inhibitor layer on the steel surface. Potentiodynamic polarization (PDP) results confirm that 1–Benz is a mixed–type corrosion inhibitor with slightly more anodic tendency. An optimum concentration of 150 ppm provided up to 83% inhibition efficiency. Based on FTIR characterization, 1–Benz interacts with the steel surface using its nitrogen atom and C=C pi-electrons and it adsorbs following the Temkin isotherm. The adsorption reduces localized corrosion, according to SEM-EDX observations. Theoretical parameters confirm that the electron–rich imidazole N atoms and electron-deficient C atoms in the phenyl ring ensure easy electron transfer between 1–Benz and the steel surface.
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Research context
OpenAlex topics: Corrosion Behavior and Inhibition · Concrete Corrosion and Durability · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Industrial Chemistry, Edo State University Uzairue, Edo State, Nigeria
Africa Centre of Excellence in Future Energies and Electrochemical Systems (ACE-FUELS), Federal University of Technology Owerri, Owerri, Nigeria
Centre for Corrosion and Protection of Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, China
Department of Chemistry, Sivas Cumhuriyet University Health Services Vocational School, Sivas, Turkey
Department of Chemistry, Faculty of Sciences, University Ibn Zohr, Agadir, Morocco
Department of Chemistry, Federal University of Technology Owerri, Owerri, Nigeria
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