The corrosion inhibition of C38 steel in 1M HCl solution by 5-(2-chlorobenzyl)-2,6- dimethylpyridazin-3-one (CBDP) was studied at temperature range 308–343K by weight loss measurement. The results indicate that the studied compound exhibits good performance as inhibitor for C38 steel corrosion in 1M HCl. The inhibition efficiency increases with decreasing temperature. The outcomes show that inhibition takes place by adsorption of the inhibitor on metal surface. The adsorption of pyridazine takes place according to Langmuir`s adsorption isotherm. Kinetic parameters (activation energy, pre-exponential factor, enthalpy of activation and entropy of activation) as well as thermodynamic parameters (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 5-(2-chlorobenzyl)-2,6-dimethylpyridazin-3-one.
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