Abstract
The corrosion performance of carbon steel in acidic medium with different concentration of synthesized organic compounds namely: 2-Phenylpyrimido[1,2-a] benzimidazol-4(1H)-one (PPBI), was investigated by Potentiodynamic Polarization Curves (PPC) and Electrochemical Impedance Spectroscopy (EIS) measurements. The obtained results reveal that (PPBI) performs excellently as good corrosion inhibitor for carbon steel in 1.0 M HCl. Polarization curves studies indicated that (PPBI) behaves as mixed-type inhibitor. The calculated inhibition efficiencies from two experiments measurements show the same evolution. Also, the inhibition efficiency was found to increase with increase of the inhibitor concentrations to reach 86 % at 10 -3 M of (PPBI) due to the adsorption of the inhibitor molecule on the electrode surface. Impedance measurements spectra exhibit one capacitive and valid the inhibitive ability confirming that this inhibitor inhibits the corrosion in 1 M HCl through adsorption process following Langmuir adsorption isotherm.
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