Electrochemical and Quantum Chemical Studies on Corrosion Inhibition Performance of 2,2'-(2-Hydroxyethylimino)bis[N-(alphaalpha-dimethylphenethyl)-N-methylacetamide] on Mild Steel Corrosion in 1M HCl Solution

Abstract

The inhibitory effect of Oxethazaine drug, 2,2'-(2-Hydroxyethylimino)bis[N-(alphaalphadimethylphenethyl)-N-methylacetamide] on corrosion of mild steel in 1M HCl solution was studied by weight loss measurements, electrochemical impedance spectroscopy and potentiodynamic polarization methods. The results of gravimetric and electrochemical methods demonstrated that the inhibition efficiency increased with an increase in inhibitor concentration in 1M HCl solution. The results from electrochemical impedance spectroscopy proved that the inhibition action of this drug was due to adsorption on the metal surface. Potentiodynamic polarization studies revealed that the molecule was a mixed type inhibitor. The adsorption of the molecule on the metal surface was found to obey Langmuir Adsorption isotherm. Potential of zero charge at the metal-solution interface was measured to provide the inhibition mechanism. The temperature dependence of the corrosion rate was also studied in the temperature range from 30 to 50 °C. Quantum chemical calculations were applied to correlate electronic structure parameters of the drug with its inhibition performance. The obtained theoretical results have been adapted with the experimental data.

Green inhibitor of carbon steel corrosion in 1 M hydrochloric acid:Eruca sativaseed extract (experimental and theoretical studies)

“…[19][20][21][22][23][24][25][26] Hetero-atoms, conjugate p bonds, and aromatic nuclei, set in organic compounds have been shown to be particularly effective at preventing corrosion in previous studies. [27][28][29][30][31][32][33][34][35][36] They lower the corrosion rate by adsorbing on the metal surface and inhibiting the active sites by displacing water molecules. Organic inhibitors, on the other hand, are toxic, expensive, and harmful to the environment.…”

Innovation of Imine Metal Chelates as Corrosion Inhibitors at Different Media: A Collective Study

“…Adsorption is how the inhibitors work on the metal surface [ 62 , 63 ]. The performance of inhibitors increases in the arrangement of P > S > N > O, as it depends on the presence of electron density stand out surrounding atoms, the number of presented binding sites for adsorption in a receptor structure size, charge densities, adsorption mechanism and the formation of metal chelates [ 64 , 65 , 66 , 67 ]. Different parameters, including the inhibitor’s molecular size, the type of substituent, the nature of the metal and the electrolyte, influence the rate of adsorption on the surface [ 68 ].…”

Efficacious Alkaline Copper Corrosion Inhibition by a Mixed Ligand Copper(II) Complex of 2,2′‐Bipyridine and Glycine: Electrochemical and Theoretical Studies

“…This is because such heteroatoms are potent of donating their electron lone pairs to the Cu atoms' vacant dorbitals, forming strong coordinate bonds. [16,17] At the same time, using their anti-bonding molecular orbitals, such compounds can accept free electrons from the Cu atom that form feedback bonds supporting their adsorption. [16,17] The presence of other structural moieties in the inhibitor molecule, such as conjugated bonds and aromatic rings (π-electrons), also enhances its adsorption and consequently results in effective corrosion inhibition.…”