Vol. 10, Issue 6 (2022)

Current study proposed to assess, the inhibition effect of 2-(5-nitro-1H-benzimidazol-2-yl)-3-(4-methoxyphenyl) acrylonitrile for copper corrosion in 1M nitric acid solution. This evaluation was conducted using gravimetric tests and density functional theory. The results proved that the inhibition power of this compound increases with the increase of reaction medium temperature, concentration and time of immersion. Adejo-Ekwenchi isotherm showed the existence of two modes adsorption: chemisorption and physisorption. In addition, this adsorption on copper surface conformed to modified Langmuir isotherm or Villamil model. It was proved that copper dissolution process is endothermic with disorders decrease. While activation thermodynamic parameters have attested that the adsorption on copper/solution interface is very favorable and stable with chemical adsorption predominance. Theoretical calculations showed that the good performance of the compound is due to its strong interaction with metal and which favors the covalent bonds formation. Thus, local parameters permitted to identify the reactivities sites of molecule.