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Abstract
The inhibitive action and adsorption behaviour of pomegranate leave extract (PGLE) on corrosion of carbon steel in 1M HCl solution at 293–333 K was investigated through chemical (weight loss measurements), electrochemical (potentiodynamic polarisation) and surface analysis [Fourier transform infrared (FTIR) and X-ray diffraction (XRD)] methods. Results obtained shows that the adsorption of PGLE molecules on the C steel surface obeyed the Langmuir adsorption isotherm and acts as mixed type inhibitor for C steel in 1M HCl with anodic as its dominant inhibitor at high concentration. The inhibitory property of the extract was discussed in terms of the mechanism by which its components adsorb onto the C steel surface. Activation energy of corrosion and other thermodynamic parameters such as standard free energy, standard enthalpy and standard entropy of the adsorption process as well as FTIR and XRD examinations of the electrode surface revealed that the corrosion inhibition of C steel in 1M HCl in the presence of PGLE is mainly controlled by the physical adsorption process.
Highlights
| 1 | Weight loss and polarisation technique improve good inhibition of pomegranate leaves extract (PGLE). | ||||
| 2 | Natural inhibitor acts as mixed type inhibitor with anodic as its dominant inhibitor at high concentration. | ||||
| 3 | Adsorption of PGLE molecules on the C steel surface was found to obey the Langmuir isotherm. | ||||
| 4 | Activation energy and free energy of adsorption suggested a spontaneous and physically adsorption process. | ||||
| 5 | The FTIR and XRD examination of C steel electrode surface also support this result. | ||||