Resumen

SEBHAOUI, J. et al. The Inhibition of Carbon Steel Corrosion in Hydrochloric Acid Media Using 2-((5-methyl-isoxazol-3-yl)-methyl)-benzimidazole. Port. Electrochim. Acta [online]. 2021, vol.39, n.3, pp.213-224.  Epub 30-Jun-2021. ISSN 0872-1904.

Carbon steel corrosion inhibition in a hydrochloric acid solution by 2-((5-methyl-isoxazol-3-yl)-methyl)-benzimidazole (MMB) has been studied by electrochemical techniques (PDP and EIS). Results showed that the inhibition efficiency increases with higher MMB concentration, and the maximum value of 86.6% was obtained at 10-3 M concentration. The prepared benzimidazole inhibitor showed higher inhibition efficiency upon raising the solution temperature from 303 to 333 K. Corrosion current density decreased from 660.9 µA cm-2 (blank) to 97.8 µA cm-2 (MMB) and charge transfer resistance increased from 20.2 Ω cm2 (blank) to 150.8 Ω cm2 (MMB). PDP studies showed that MMB is a mixed type inhibitor. The adsorption of this compound onto the carbon steel surface in a 1 M HCl solution followed the Langmuir adsorption isotherm, and the value of the standard free energy of adsorption () is associated to physisorption and chemisorption.

Palabras clave : carbon steel; corrosion inhibition; Benzimidazole; electrochemical techniques.

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