Critical Research on Enhancement of the Inhibitor Efficiency of 4-Phenyl-1,2-dithiol-3-thione on Corrosion of Mild Steel for 20% Sulphuric Acid | Chapter 7 | Current Research and Development in Chemistry Vol. 4

 Substituted 4-phenyl-1,2-dithiol-3-thione (PDTT), synthesised and tested as a mild steel corrosion inhibitor in the presence of oxygen by the technique of potentiodynamic polarisation and electrochemical impedance spectroscopy (EIS) in 20% H2SO4 at 25oC. Also at low concentrations, this organic compound prevents acidic corrosion. The results obtained indicate that this sulphur compound is and is in good agreement with good inhibitors. Polarization curves suggest that 4-phenyl-1,2-dithiol-3-thione is a cathodic inhibitor and has been studied to model the corrosion inhibition mechanism via an effective analogous circuit model in order to minimise the corrosion current obtained from electrochemical impedance spectroscopy measurement. 4-phenyl-1,2-dithiol-3-thione adsorption on the steel surface in a 20 percent H2SO4 solution complies with Langmuir's isotherm with a very high negative adsorption free energy value.

Author (s) Details

M. Dakmouche
Laboratoire de Valorisation et Promotion des Ressources Sahariennes, Université Kasdi Merbah de Ouargla, 30000 Ouargla, Algeria.

M. Saidi
Laboratoire de Valorisation et Promotion des Ressources Sahariennes, Université Kasdi Merbah de Ouargla, 30000 Ouargla, Algeria.

M. Hadjadj
Laboratoire de Valorisation et Promotion des Ressources Sahariennes, Université Kasdi Merbah de Ouargla, 30000 Ouargla, Algeria.

M. Yousfi
Laboratoire des Sciences Fondamentales, Université de Laghouat, 03000 Laghouat, Algeria.

Z. Rahmani
Laboratoire de Valorisation et Promotion des Ressources Sahariennes, Université Kasdi Merbah de Ouargla, 30000 Ouargla, Algeria.

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