Journal of Electrochemical Science and Engineering (Apr 2021)

Mild steel corrosion inhibition by synthesized 7-(Ethylthiobenzimidazolyl) Theophylline

  • N’guessan Yao Silvère Diki,
  • Nagnonta Hippolyte Coulibaly ,
  • Kadjo François Kassi,
  • Albert Trokourey

DOI
https://doi.org/10.5599/jese.952

Abstract

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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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