Sour corrosion of C1018 carbon steel and its inhibition by 1-benzylimidazole: electrochemical, SEM, FTIR and computational assessment

Onyeachu I. B., Njoku D., Kaya S., El Ibrahimi B., Nnadozie C. F.

JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY, cilt.36, sa.7, ss.774-794, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 36 Sayı: 7
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1080/01694243.2021.1938474
  • Dergi Adı: JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
  • Sayfa Sayıları: ss.774-794
  • Anahtar Kelimeler: Sour corrosion, carbon steel, imidazole, DFT, EIS, FTIR, MILD-STEEL, MOLECULAR-DYNAMICS, THEORETICAL EVALUATION, IMIDAZOLE DERIVATIVES, HYDROCHLORIC-ACID, HYDROGEN-SULFIDE, BENZIMIDAZOLE, ADSORPTION, BRINE, IRON
  • Sivas Cumhuriyet Üniversitesi Adresli: Evet

Özet

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.