Mild steel corrosion inhibition by 7-(ethylthiobenzimidazolyl) theophylline

  • N’guessan Yao Silvère Diki Laboratoire de Chimie Physique de l’Université Félix Houphouët- Boigny, 22BP 582 Abidjan 22, Côte d’Ivoire https://orcid.org/0000-0001-6792-6164
  • Nagnonta Hippolyte Coulibaly UFR Sciences et Technologies, Université de Man, BP 20 Man, Côte d’Ivoire
  • Kadjo François Kassi Laboratoire de Thermodynamique et de Physico-Chimie du Milieu, UFR SFA, UNA, Côte d’Ivoire
  • Albert Trokourey Laboratoire de Constitution et Réaction de la Matière, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
Keywords: Corrosion, mild steel, 7-(ethylthiobenzimidazolyl) theophylline, weight loss, Tafel polarization, DFT.
Graphical Abstract

Abstract

The corrosion inhibition of mild steel by 7-(ethylthiobenzimidazolyl) theophylline (7-ETBT) in 1 M HCl medium was investigated through weight loss and Tafel polarization techniques within a temperature range of 298 to 318 K. The inhibition efficiency depends on the concen­tration of 7-ETBT and reaction system temperature. The maximum inhibition efficiency values of 90.73 and 87.06 %, respectively, were estimated using both weight loss and Tafel polarization techniques at 298 K. The results suggest spontaneous and predominant physical adsorption of 7-ETBT on the metal surface which obeys Langmuir isotherm model. Furthermore, Tafel polarization method revealed that 7-ETBT is a mixed-type inhibitor. Po­tentiodynamic polarization results are in accordance with weight loss data to a good extent.

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Published
20-04-2021
Section
Electrochemical Science