Theoretical and Experimental Study of Corrosion Behavior of Carbon Steel Surface in 3.5% NaCl and 0.5 M HCl with Different Concentrations of Quinolin-2-One Derivative

Abstract

A theoretical and protection study was conducted of the corrosion behavior of carbon steel surface with different concentrations of the derivative (Quinolin-2-one), namely 7-Ethyl-4-methyl-1-[(4-nitrobenzylidene)-amino]-1H-quinolin-2-one (EMNQ2O). Theoretically, Density Functional Theory (DFT) of B3LYP/ 6-311++G/ 2d, 2p level was carried out to calculate the geometrical structure, physical properties and chemical inhibition chemical parameters, with the local reactivity in order to predict both the reactive centers and to know the possible sites of nucleophilic and electrophilic attacks, in vacuum and two solvents (DMSO and H 2 O), all at the equilibrium geometry. Experimentally, the inhibition efficiencies (%IE) in (3.5% NaCl) and (0.5M HCl) solutions were studied using potentiometric polarization measurements. The results revealed that the (%IE) in the salty solution (94.98%) is greater than that in the acidic solution (81.40%). The thermodynamic parameters obtained, supported the physical adsorption mechanism and the adsorption followed the Langmuir adsorption isotherm. The surface changes of the carbon steel were studied using SEM (Scanning Electron Microscopy) and AFM (Atomic Force Microscopy) techniques.

Surface Modification of the Improved Stainless Steel Alloy AISI-304 and the Use of Diffusion Coating and a Study of Its Efficiency in Resistivity Hot Corrosion in an Atmosphere of Sodium Chloride Vapor NaCL and Sodium SulfateNa_2 SO_4

“…Samples were allocated for microscopic examination after the completion of the coating operations, where cold basing operations were carried out on them and the smoothing and polishing process was conducted on them, then a microscopic examination was conducted to determine the thickness of the coating and the structures that appeared as a result of the coating 22,23 . As for the display process (Etching) It was done by using the revealing solution, which is a solution of ferric chloride FeCl 3 (5gm) and hydrochloric acid HCl (50mL) and distilled water 100 mm.…”

Enhancement of corrosion protection of metal carbon steel C45 and stainless steel 316 by using inhibitor (Schiff base) in sea water

“…The most important of these materials are TiO2, ZnO, Al2O3, ZrO2…etc [3][4][5] , nanopolymers [6][7][8] , carbon nanomaterials (as reduced graphene oxide, graphene, and carbon nanotubes) [9][10][11][12] , drugs [13][14][15][16] , and environmentally friendly materials 17 all of which are reported. The second method that is used to reduce corrosion is the use of the so-called corrosion inhibitors 18 , which are chemical compounds, especially organic compounds (drugs or ligands; Especially ligands that contain nitrogen atoms [19][20][21] , such as Schiff bases [22][23][24][25] or other ligands [26][27][28][29] ) or nanoparticles 30 , that are added in small concentrations to the corrosion medium, they reduce corrosion by decreasing cathodic reduction or anodic oxidation, or both, by making a film on the metal surface. It is assumed that the adsorption of inhibitors on the surface of the metal is either through physical adsorption or chemical adsorption 31 .…”