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The purpose of this work lies in the use of ionic liquids as corrosion inhibitors due to the difficulty in some oil fields with the solubility of corrosion inhibitors and these materials can be miscible with water and thus provide a solution to such problems in the industry. The second purpose is concerned with the lower toxicity of these compounds compared with the most common corrosion inhibitors. The study covered the corrosion inhibition performance of the ionic liquid 1-butyl-3-methylimidazolium trifluoromethyl sulfonate ([BMIm]TfO) for carbon steel in 3.5% NaCl solutions. The study comprised electrochemical, adsorption, and quantum chemical investigations. The results manifested that [BMIm]TfO can be considered a promising corrosion inhibitor and the inhibition efficacy intensifies as the concentration rises. The observed inhibitive effect can be correlated to the adsorption of the ionic liquid species and the creation of protecting films on the surface. The mode of adsorption follows the Langmuir adsorption isotherm. The polarization results showed that the ionic liquid [BMIm]TfO functions as a mixed inhibitor. Reliance of the corrosion influence on the temperature in the existence and absence of [BMIm]TfO was demonstrated in the temperature range of 303–333 K using polarization data. Activation parameters were determined and discussed. The observed inhibition performance of [BMIm]TfO was correlated with the electronic properties of the ionic liquid using a quantum chemical study. [ABSTRACT FROM AUTHOR]

Abstract Recovery shrimp waste protein (RSWP) was extracted, characterized and tested their inhibition effects as a corrosion inhibitor for carbon steel in 1 M HCl solution using different electrochemical techniques. The results have been shown that the corrosion rate decreases with increasing inhibitor concentration. To verify the morphology of RSWP film formed on the carbon steel surface, scanning electron microscopy (SEM) was used. The inhibition mechanism of the extracted RSWP is discussed in terms of adsorption on the carbon steel surface. The results of the energy adsorption were showed chemisorption effect for RSWP on the carbon steel surface. [ABSTRACT FROM AUTHOR]

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. [ABSTRACT FROM AUTHOR]