A Study into the Corrosion Inhibition of Carbon Steel in Acidic Medium Using Eco-Friendly Compounds

الملخص

The corrosion inhibition effects of cefixima and aminobenzylpenicillin drug inhibitors in 0.05M deaerated sulfuric acid solution for carbon steel have been studied by using electrochemical techniques and quantum chemical calculations as well as scanning electron microscope (SEM). It is observed from the experimental findings that both compounds perform as good inhibitors and behave according to mixed type inhibitor in terms of their inhibitory action. Additionally, it was found the percentage of corrosion inhibition become maximal when the concentrations of the cefixima and aminobenzylpenicillin inhibitors are increased. The influence of temperature on the corrosion of carbon steel has been investigated and the activation energy values estimated. The corrosion efficiency decreases with increasing the temperature range. The parameters of thermodynamic have been determined and indicate that the adsorption mechanism follows the Langmuir isotherm model and forms a protective layer on carbon steel surface electrode, which was characterized by scanning electron microscope measurements, to prevent a corrosion process. Quantum chemical calculations have been performed to provide evidence for corrosion inhibition according to the chemical structures of the cefixima and aminobenzylpenicillin drug inhibitors.