Inhibitive Action of Benzaldehyde Thiosemicarbazones on the Corrosion of Mild Steel in 3 M H3PO4

The inhibition efficiency of some Benzaldehyde thiosemicarbazone derivatives for mild steel corrosion in 3.0 mol/L H3PO4 at 30.0 ±0.1 0C were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). These compounds inhibit the corrosion rate even at very low con...

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Bibliographic Details
Published in:International journal of electrochemical science 2012-12, Vol.7 (12), p.11718-11733
Main Authors: Abd-El-Nabey, B.A., Abdel-Gaber, A.M., Elewady, G.Y., Sadeek, M.M.El, Abd-El-Rhman, H.
Format: Article
Language:English
Subjects:
EIS
mild steel
molecular structure
Phosphoric acid
Potentiodynamic
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Summary:The inhibition efficiency of some Benzaldehyde thiosemicarbazone derivatives for mild steel corrosion in 3.0 mol/L H3PO4 at 30.0 ±0.1 0C were investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). These compounds inhibit the corrosion rate even at very low concentrations and the order of increasing inhibition efficiency was correlated with the modification of the molecular structure of the inhibitors. Polarization curves indicated that these compounds acted primarily as mixed-type inhibitors. Electrochemical impedance spectroscopy results indicated that dissolution process of steel in phosphoric acid occurs under activation control. The effect of temperature on the inhibitive action of these compounds was evaluated for the corrosion of mild steel in 3.0 mol/L H3PO4 acid. Theoretical fitting of the kinetic–thermodynamic model of the adsorption of inhibitors at the metal surface are tested to clarify the nature of adsorption.
ISSN:1452-3981
1452-3981
DOI:10.1016/S1452-3981(23)16499-6