Synthesis, Electrochemical, Thermodynamic, and Quantum Chemical Investigations of Amino Cadalene as a Corrosion Inhibitor for Stainless Steel Type 321 in Sulfuric Acid 1M

Abstract

The corrosion of stainless steel is one of the major industries’ issues that gained wide interest among researchers. It became necessary to develop and apply eco-friendly approaches to corrosion control. This work explores the inhibitory effect of a newly synthesized amino cadalene (ACM) on the corrosion of stainless steel type 321 in sulfuric acid 1M. Particularly, the experimental study consisting of electrochemical and surface analyses was conducted in conjunction with a theoretical approach. The electrochemical results showed that ACM acted as a mixed-type corrosion inhibitor and the inhibition efficiency attained 91% at 10−3M. EIS measurements revealed that both metal charge transfer and diffusion processes are involved in the interfacial metal/solution reactions. The interfacial mechanism is thoroughly investigated; the physisorption of the protonated molecules was preceded by the formation of a negative layer due to adsorption of the solution anionic species. The experimental insights are corroborated with the quantum chemical calculations.

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

“…The dipole moment is the third crucial characteristic, which is employed for structural circulation and rationalization. 139,140 The dipole moment ( μ ) is another indicator that is frequently used to predict the direction of corrosion inhibition. It is a measure of the polarity of the bond and corresponds to the distribution of electrons in the molecule.…”

“… 138 When the inhibitor has a large dipolemoment, it causes a strong interaction (dipole–dipole contact) on the iron surface, resulting in long-lasting adsorption on the carbon steel surface and better inhibition. 139 Due to the electrostatic attraction between an organic dipole and a charged alloy surface, physical adsorption of the organic retarder onto the metal surface is increased, and hence the bigger dipole moment of the adsorption molecules is favored ability. The shape of the dipole torque changed substantially in protons, implying that Eruca sativa extract is physically adsorbed on the steel surface in the form of a proton can molecule, according to a study of dipole moments.…”

A Study of 1-Benzyl-3-phenyl-2-thiourea as an Effective Steel Corrosion Inhibitor in 1.0 M HCl Solution

“…e corrosion inhibition efficiency obtained from the EIS method is calculated according to equation ( 5) [16][17][18]:…”

“…For better visualization of the inflection points of the impedance module as well as the phase angle variation, Bode and phase angle plots are also analyzed and depicted in Figure 2 [18]. e value of the phase angle increases significantly as the inhibitor concentration increases.…”

Expired Chicken Egg-White Extract’s Adsorption Behavior As a Corrosion Inhibitor for Carbon Steel in 1M HCl

“…e current densities without and with inhibitor, as calculated by extrapolation of the Tafel lines, are I corr and I inh , respectively [51,52].…”