Synthesis, Characterization and Anti-Corrosion Properties of Novel Quinolinol on C-steel in a Molar Hydrochloric Acid Solution

Abstract

New quinoline, namely 5-(ethoxymethyl)-8-quinolinol (M-QN), has been synthesized and characterized by different spectral methods, such as 1 H NMR, <13 C NMR and IR spectra. Its inhibitive action against the corrosion of carbon steel in 1.0 M hydrochloric acid solution was investigated at different temperatures in the range from 25±2 to 55±2 °C by a series of known techniques, such as weight loss, open circuit potential (OCP), electrochemical impedance spectroscopy (EIS) and Tafel polarization measurements. The inhibition efficiencies obtained from all employed methods are in good agreement with each other. The obtained results show that M-QN compound is a very good inhibitor with an efficiency of 97.7 % at 10 -3 M additive concentration in a 1.0 M HCl solution. The inhibition efficiency increased with an increase of the inhibitor's concentration. Changes in impedance parameters (Rct and Cdl) were indicative of adsorption of the compound (M-QN) on the metal surface, leading to the formation of a protective film. Tafel polarization measurements showed that M-QN inhibitor is of a mixed type. The adsorption of the inhibitor on the surface of carbon steel in a 1.0 M HCl solution was found to obey Langmuir's adsorption isotherm. The kinetic and thermodynamic parameters for carbon steel corrosion and inhibitor adsorption, respectively, were determined and discussed. On the bases of thermodynamic adsorption parameters, comprehensive adsorption (physisorption and chemisorption) for the studied inhibitors on carbon steel surface was suggested.

1-Octyl-2-(octylthio)-1H-benzimidazole as a New and Effective Corrosion Inhibitor for Carbon Steel in 1 M HCl

“…In the inhibitors presence, both anodic and cathodic Tafel slopes remained almost unchanged ( Fig. 2), indicating that the inhibitors acted by merely blocking the reaction sites of the metal surface, without changing the anodic and cathodic reaction mechanisms [25]. Furthermore, even in the inhibitor presence, it was observed that the corrosion rate increased at more positive potentials to ~ -0.250 V, and that the mechanism of anodic dissolution reaction changed.…”

“…The calculation parameters used in the geometry optimization for the T3-Fewater system. For the whole simulation procedure, the COMPASS (Condensed-phase Optimized Molecular Potentials for Atomistic Simulation Studies) force field [25] was used to optimize the structures of all the system's components. COMPASS is the first ab-initio force field that enables accurate and simultaneous prediction of chemical properties (structural, vibrational, conformational, etc.)…”

“…In the current study, the MD simulation was performed to study the system behavior, i.e., single inhibitor molecule / solvent molecules / iron surface [25].…”

Effect of bismuth and bore content in glass system inhibitor on the corrosion behavior of mild steel in 1M hydrochloric acid solution

“…This observation shows that the activation controls hydrogen evolution, and the presence of inhibitor does not change the mechanism of the cathodic evolution reaction [28][29] . From Table 4, the inhibition efficiency increased with decreasing the concentration of S1 and this inhibitor affect the cathodic and anodic inhibition through adsorption on the working electrode surface by blockage of the active sites 30 . The corrosion potential Change slightly.…”

New triazepine carboxylate derivatives: correlation between corrosion inhibition property and chemical structure

“…heteroatoms such as oxygen (O), nitrogen (N), phosphorus (P), sulfur (S); 2. aromatic component having multiple bonds leading to easier adsorption on the metal surface; 3. functional groups such as = NH, -CHO, -C≡N, -N = N-…; 4. heterocyclic compounds such as imidazole, quinoline, quinoxaline, phenyltetrazole, etc. [6,7].…”