Corrosion And The Corrosion Of Mild Steel
N aminophthalimide as synthon for heterocyclic Schiff bases: Efficient utilization as corrosion
inhibitors of mild steel in 0.5 mol.L 1 H2SO4 solution
Mohamed M. Abdelaal [a]*, Y.F. Barakat [a], Hamed A. Y. Derbala [b], Hamdy H. Hassan [b]
[a] Tabbin Institute for Metallurgical Studies, P.O. Box 109 Helwan, Cairo, Egypt.
[b] Chemistry Department, Faculty of Science, Ain Shams University, Abbasiya, Cairo, Egypt,
11566.
*Corresponding author: E mail address:
[email protected]
Abstract
Many Schiff bases, including two novel compounds, were prepared to inhibit the corrosion
reactions of mild steel in acidic medium. Their chemical structures were determined using IR, Mass
spectrometry and 1HNMR spectroscopic analysis. The results showed that the protection of mild
steel, by these Schiff bases, depends on many factors like function group, inhibitor dose and the
temperature of the medium. Thermodynamic adsorption parameters (Kads, О”Gads) of studied
inhibitors were calculated using the Langmuir adsorption isotherm. The presence of iodide ions in
the medium increased the efficiency of these inhibitors. AC impedance spectroscopy was used to
determine the polarization resistance. The scanning electron microscopy (SEM) showed the
corrosion products decreased after using these inhibitors. In addition, the best inhibitor in this study
used to increase corrosion inhibition of treated sample by Electrolytic plasma process (EPP).
Key words: N aminophthalimide; Schiff bases; Mass
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