Inhibition Effect of 6-bromo-3-nitro-2-phenylimidazol[1,2-α] pyridine on the Corrosion of C38 Steel in H2SO4 Solution

The inhibition effect of 6-bromo-3-nitro-2-phenylimidazol[1,2-α] pyridine (BNPP) on the corrosion of C38 steel in 0.5 M H2SO4 was studied by weight loss , electrochemical methods. The results showed that BNPP was a good inhibitor in 0.5 M H2SO4 and this adsorption obeyed the Langmuir adsorption isotherm. The results obtained from the different corrosion evaluation techniques are in good agreement. Polarization curves showed that BNPP acted as a mixed-type inhibitor in sulfuric acid. The effect of the temperature on the corrosion behavior with addition of 10-3M of the inhibitor was studied in the temperature range 298-328 K, and the thermodynamic parameters were determined and discussed. Quantum chemical approach, using the density functional theory (DFT), was applied in order to get better understanding about the relationship between the inhibition efficiency and molecular structure of BNPP. The theoretical results were found to be consistent with the experimental data

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