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International Journal of Corrosion
Volume 2018, Article ID 9212705, 15 pages
Research Article

Electrochemical Studies of Monoterpenic Thiosemicarbazones as Corrosion Inhibitor for Steel in 1 M HCl

1Laboratory of Physical Chemistry of Materials and Environment, Department of Chemistry, Faculty of Science Semlalia, Cadi Ayyad University, BP 2390, Marrakech, Morocco
2Organic Synthesis and Molecular Physico-Chemistry Laboratory, Department of Chemistry, Faculty of Science Semlalia, Cadi Ayyad University, BP 2390, 40001 Marrakech, Morocco

Correspondence should be addressed to A. Benyaich;

Received 8 November 2017; Accepted 8 February 2018; Published 21 March 2018

Academic Editor: Tuan Anh Nguyen

Copyright © 2018 R. Idouhli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We have studied the inhibitory effect of some Monoterpenic Thiosemicarbazones on steel corrosion in 1 M HCl solution. The potentiodynamic polarization and electrochemical impedance spectroscopy were used. The Monoterpenic Thiosemicarbazones have inhibited significantly the dissolution of steel. The inhibition efficiency increased with increasing inhibitor concentration and also with the increase in temperature (293–323 K). Furthermore, the results obtained revealed that the adsorption of inhibitor on steel surface obeys Langmuir adsorption model and the thermodynamic parameters such as enthalpy and activation energy were determined. The scanning electron microscopy combined with dispersive X-ray spectroscopy examinations were used to see the shape of the surface morphology and to determine the elemental composition. Scanning electron microscope (SEM) images show that the surface damage decreases when the inhibitor is added. The quantum chemical calculations using density functional theory (DFT) were performed in order to provide some insights into the electronic density distribution as well as the nature of inhibitor-steel interaction.