Temperature Effects on the Corrosion Inhibition of Carbon Steel in Acidic Solutions by Alizarin Red

D. Ben Hmamou, R. Salghi, H. Zarrok, Abdelkader Zarrouk, B. Hammouti, M. El Hezzat, M. Bouachrine

Abstract


Gravimetric method was used to study the temperature effects on carbon steel corrosion in 2.0 M of H3PO4 in the absence and presence of alizarin red (AZR). In this study, the results revealed that the inhibition efficiency of AZR increases with increasing concentration, but an increase or decrease in the inhibitor efficiency depending on its concentration is detected with increasing temperature. However, the AZR inhibited carbon steel corrosion at all inhibitor concentrations and solution temperatures. The inhibition action of AZR was performed via adsorption of the alizarin red on carbon steel surface. Both kinetic parameters (activation energy, pre-exponential factor, enthalpy of activation and entropy of activation) and thermodynamics of adsorption (enthalpy of adsorption, entropy of adsorption and Gibbs free energy) were calculated and discussed. Quantum chemical calculations using DFT at the B3LYP/6-31G* level of theory was further used to calculate some electronic properties of the molecule in order to ascertain any correlation between the inhibitive effect and molecular structure of AZR

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