Original scientific paper
https://doi.org/10.5599/jese.952
Mild steel corrosion inhibition by 7-(ethylthiobenzimidazolyl) theophylline
N’guessan Yao Silvère Diki
orcid.org/0000-0001-6792-6164
; Laboratoire de Constitution et Réaction de la Matière, UFR SSMT, Université Félix Houphouët-Boigny, 22 BP 582 Abidjan 22, Côte d’Ivoire
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
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 concen-tration 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. Po-tentiodynamic polarization results are in accordance with weight loss data to a good extent.
Keywords
Organic inhibitor; inhibition efficiency; weight loss, Tafel polarization; physical adsorption
Hrčak ID:
256597
URI
Publication date:
25.4.2021.
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