alexa Inhibition of carbonsteel corrosion in acidic solution usingsomenewly polyester derivatives.


Journal of Steel Structures & Construction

Author(s): Farag AA, Ismail AS, Migahed M

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Two polyesters derivatives of maleic and phthalic anhydride with polyethylene glycol were synthesized and characterized by gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR) and x-ray diffraction (XRD). The efficiency of these compounds as corrosion inhibitors for carbon steel in 1 M HCl, has been determined by gravimetric and electrochemical measurements. Surface morphologies scanning electron microscopy (SEM) and energy dispersion X-ray (EDX) were used to characterize the steel surface. These compounds inhibit corrosion even at very low concentrations in 1 M HCl and the aromatic phthalate derivative showed superior inhibition efficiency than the aliphatic maleate derivative. The polarization curves indicate that the compounds are mixed-type inhibitors, affecting both anodic and cathodic corrosion currents. Adsorption of these compounds on the carbon steel surface is in agreement with the Langmuir adsorption isotherm model. The calculated Gibbs free energy values confirm the chemical nature of the adsorption.

This article was published in Journal of Molecular Liquids and referenced in Journal of Steel Structures & Construction

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