Novel Schiff base amino acid as corrosion inhibitors for carbon steel in CO2-saturated 3.5% NaCl solution: experimental and computational study

Abstract

Novel Schiff base amino acid as corrosion inhibitors for carbon steel in CO 2 -saturated 3.5% NaCl solution: experimental and computational study Abstract: The corrosion inhibition and adsorption behavior of some novel Schiff bases based on amino acids on carbon steel in CO 2 -saturated 3.5% NaCl solution at 50°C was investigated using gravimetric, potentiodynamic polarization, linear polarization resistance corrosion rate, and scanning electron microscope (SEM)/energy-dispersive X-ray spectroscopy analysis (EDAX) techniques. Results show that the inhibition efficiency increases when the inhibitor concentration increases. Potentiodynamic polarization curves reveal that the used Schiff bases are mixedtype inhibitors. Experimental data indicate that these Schiff base inhibitors adsorb at the carbon steel/solution interface according the Langmuir adsorption isotherm. SEM/EDAX was used to examine the surface morphology of carbon steel samples in the absence and presence of the inhibitors. Quantum chemical calculations were further applied to explain the experimental results. . His current research interests are quantum chemistry and materials design.

Synergistic effect of polyethylene glycols and rare earth Ce4+ on the corrosion inhibition of carbon steel in sulfuric acid solution: electrochemical, computational, and surface morphology studies

“…The value of K ads was 9.1 9 10 3 and 14. Values of around -20 kJ mol -1 and below are associated with a physisorption mechanism, whereas values around -40 kJ mol -1 and above are associated with a chemical adsorption mechanism [4,5]. The DG ads value obtained in the present investigation was -32.5 and -33.6 kJ mol -1 for PEG(I) and PEG(II), respectively.…”

“…Concern regarding corrosion of carbon steel by H 2 SO 4 has increased in the oil and gas industry because of recent studies concerning transformation of SO x and H 2 S produced during refining and oil extraction into concentrated H 2 SO 4 [3]. There is general consensus that the most practical method to protect metal deployed in such corrosive environments is addition of corrosion inhibitors [4][5][6]. Recently, use of polymers as corrosion inhibitors has attracted great attention.…”

Catalytic evaluation of copper (II)N‐salicylidene‐amino acid Schiff base in the various catalytic processes

“…Preparation of the current coordinated ligand (HPST) is similar to the reported synthesis of various N ‐salicylidene amino acid Schiff base ligands of different amino acids . HPST is a novel ligand that was synthesized by direct condensation of 5‐sodium sulfonate salicylaldehyde with tyrosine in equimolar ratios in an aqueous media.…”

“…Preparation of HPST, as a new derivative of amino acid Schiff bases, is similar to the reported synthesis of various N ‐salicylidene amino acid Schiff base ligands of different amino acids, which was carried out by direct condensation of 5‐sodium sulfonate salicylaldehyde (5.0 mmol, 1.12 g) with tyrosine (5.0 mmol, 0.90 g) in equimolar ratios in an aqueous media (30.0 ml) with heating at 70°C for 30 min affording the desired ligand with yellow color. HPST was characterized by NMR, IR and UV–Vis spectra, as well as elemental analyses.…”

Experimental and Theoretical Studies of the Corrosion Inhibition of 4-amino-2-(4-chlorophenyl)-8-(2, 3-dimethoxyphenyl)-6-oxo-2, 6-dihydropyrimido [2, 1-b][1, 3] thiazine-3,7-dicarbonitrile on Carbon Steel in a 1.0 M HCl Solution

“…The above results indicate that retardation of the samples corrosion processes at cathodic and anodic reaction sites occurred, and this was due to the adsorption of these sites by the inhibitor molecules [30][31][32][33]. On the other hand, cathodic Tafel curves gave rise to parallel Tafel lines, indicating that hydrogen evolution reaction is activation-controlled, that a stronger inhibition effect of the inhibitors does not affect the reduction mechanism, and that their inhibition action is blocking the metal surface [34].…”