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Evaluating Synthesized Schiff base as Corrosion Inhibitor on Carbon Steel in 0.5 M HCl and 0.5 M H2SO4
B. A. Elsayed1, M. A. Hegazy2, H. M. H. Abd El-Bary3, Ahmed A. Abdel Salam4

1Badr A. El-sayed, Professor, Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt.
2M. A. Hegazy, Professor, Department of Physical Chemistry, Egyptian petroleum research, Cairo, Egypt.
3H. M. H. Abd El-Bary, Professor, Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt.
4Ahmed A. Abdel Salam, Department of Chemistry, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt.
Manuscript received on June 09, 2016. | Revised Manuscript received on June 24, 2016. | Manuscript published on June 30, 2016. | PP: 21-35 | Volume-3 Issue-4, June 2016. | Retrieval Number: D0373063416
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© The Authors. Published By: Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: The inhibition effect of synthesized schiff base on the corrosion of carbon steel in (0.5 M HCl and 0.5 M H2SO4 ) was studied at different temperatures (25–55 ºC) by weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization methods. The carbon steel surface morphology was investigated by SEM. The obtained results showed that the prepared schiff base is excellent inhibitor in (0.5 M HCl and 0.5 M H2SO4 ) and the inhibition efficiency (η) increases with the inhibitor concentration, but it decreases with increasing temperature. The adsorption of inhibitor on the surface of carbon steel is mixed chemical and physical adsorption and found to obey the Langmuir adsorption isotherm equation. Thermodynamic parameters have been obtained by adsorption theory. Polarization curves showed that the synthesized inhibitor is mixed-type inhibitor in both hydrochloric acid and sulfuric acid. Data obtained from electrochemical impedance spectroscopy (EIS) studies were analyzed to model-inhibition process through appropriate equivalent circuit model. Potentiodynamic polarization studies have been shown that the inhibitor acts as a mixed type of inhibitor. Scanning electron microscope (SEM) confirmed the protection of the carbon steel surface by the inhibitor
Keywords: (0.5 M HCl and 0.5 M H2SO4 ), (EIS), SEM., (25– 55 ºC), (η), (EIS), Potentiodynamic, hydrochloric.