Study of the protection of aluminum in hydrochloric acid (1 M) by 2-(1H-benzo[d]imidazol-2-yl)-3-phenylacrylonitrile: gravimetric analysis and thermodynamic parameters

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This study evaluates the inhibitory effect of the organic compound 2-(1H-benzo[d]imidazol-2-yl)-3-phenylacrylonitrile on aluminum corrosion in a 1 M hydrochloric acid solution, using the mass loss method. The results show that the inhibitory efficiency increases with the concentration of the inhibitor, while it decreases as the temperature of the corrosive medium rises. To better understand the interactions between the metal surface and the inhibitor molecule, several adsorption isotherm models, notably those of Langmuir, Freundlich, Temkin, and El-Awady, were applied. The Dubinin–Radushkevich and Adejo–Ekwenchi isotherms helped clarify the mechanism and mode of inhibitor adsorption on aluminum. Furthermore, the thermodynamic parameters related to adsorption and activation phenomena were determined to explain the compound’s inhibitory behavior in an acidic medium.

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