In-depth unveiling the interfacial adsorption mechanism of triazine derivatives as corrosion inhibitors for carbon steel in carbon dioxide saturated oilfield produced water

In this work, two triazine derivatives (BTT-1 and BTT-2) were synthesized by the simple one-step condensation of three components and used as high-efficient corrosion inhibitors to deal with the corrosion issue of carbon steel (CS) in petroleum industry. Electrochemical tests indicate that both BTT-1 and BTT-2 present superior inhibition performance with the inhibition efficiency of 97.9 % and 98.4 % at a low concentration of 0.18 mM, respectively. Quantum chemical calculations reveal that compared to BTT-1 molecule with a butyl chain, the introduction of benzyl group endows BTT-2 molecule with more adsorption sites, which favors the adsorption of BTT-2 molecule on CS surface. Furthermore, the GFN-xTB calculations demonstrate that BTT-1 and BTT-2 could adsorb on CS surface through the formation of Fe-N and Fe-S bonds. Compared to BTT-1, BTT-2 exhibits stronger adsorption on CS surface by forming more and shorter bonds with a more negative adsorption energy, which accounts for the better inhibitive performance of BTT-2.

Adsorption and Computational Studies for Evaluating the Behavior of Silicon Based Compounds as Novel Corrosion Inhibitors of Carbon Steel Surfaces in Acidic Media

Two organo-silicon compounds namely; di-triethanolamine siloxane and bis (dithioamine triethanolamine) siloxane were employed as inhibitors for C-steel alloys corrosion in 1 M H2SO4 solution utilizing potentiodynamic polarization, electrochemical impedance and computational studies. According to both polarization and impedance data, it has been found that the investigated organo-silicon compounds work as efficient corrosion inhibitors and the protection aptitude raised by increasing the inhibitor concentration. The shown behavior of the tested compounds is cathodic and anodic type inhibition following Langmuir’s adsorption isotherm. The evaluated adsorption parameters, adsorption equilibrium constant (K ads) and Gibbs free energy of adsorption ( Δ G ads o ) $(\Delta G_{{\rm{ads}}}^o)$ reveal a good association between the inhibitor molecules and the surface of carbon steel in a predominantly chemisorptions manner. In the view of computational quantum and molecular dynamic simulation studies, molecular structure effectiveness and suggested mechanism of protection efficiency were discussed. Surface characterization studies such as scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and X-ray diffraction (XRD) have been utilized as corroborative tools for confirming the presence of the defensive inhibitor film on the surface of a metal.

Inhibition of mild steel corrosion in hydrochloric acid using two novel pyridine Schiff base derivatives: a comparative study of experimental and theoretical results

Herein, we present a comparative study of experimental and theoretical results on the inhibition of mild steel corrosion in hydrochloric acid using two novel pyridine Schiff base derivatives.

Green Schiff's bases as corrosion inhibitors for mild steel in 1 M HCl solution: experimental and theoretical approach

Three cysteine based Schiff bases were synthesized and their corrosion inhibition properties on mild steel in 1 M HCl solution were evaluated using weight loss and electrochemical studies and quantum chemical calculations.

Adsorption and corrosion inhibition effect of Schiff base molecules on the mild steel surface in 1 M HCl medium: a combined experimental and theoretical approach

Corrosion inhibition performance of 2-(2-hydroxybenzylideneamino)phenol (L(1)), 2-(5-chloro-2-hydroxybenzylideneamino)phenol (L(2)) and 2-(2-hydroxy-5-nitrobenzylideneamino)phenol (L(3)) on the corrosion behaviour of mild steel surface in a 1 M hydrochloric acid (HCl) solution is investigated by sophisticated analytical methods like potentiodynamic polarization, electrochemical impedance spectroscopy and weight loss measurements. Polarization studies showed that all the compounds are mixed type (cathodic and anodic) inhibitors and the inhibition efficiency (η%) increased with increasing inhibitor concentration. The inhibition actions of these Schiff base molecules are discussed in view of blocking the electrode surface by means of adsorption of the inhibitor molecule obeying the Langmuir adsorption isotherm. Scanning electron microscopy (SEM) studies of the metal surfaces confirmed the existence of an adsorbed film. Density functional theory (DFT) and molecular dynamics (MD) simulation have been used to determine the relationship between molecular configuration and their inhibition efficiencies. The order of inhibition performance obtained from experimental results is successfully verified by DFT and MD simulation.

Evaluating two new Schiff bases synthesized on the inhibition of corrosion of copper in NaCl solutions

An AND or DSM organic film can be formed onto a copper surface in 3% NaCl solution and acts as a barrier to copper dissolution and O₂reduction.

Insights into the corrosion inhibition of copper in hydrochloric acid solution by self-assembled films of 4-octylphenol

4-Octylphenol was used to form self-assembled films on copper to inhibit its corrosion in 0.5 M HCl solution.

Corrosion inhibition of mild steel by an imidazolium ionic liquid compound: the effect of pH and surface pre-corrosion

The corrosion inhibition performance of 1-decyl-3-methylimidazolium chloride (DMICL) on mild steel was investigated in a carbon dioxide-saturated NaCl solution at pH 3.8 and 6.8.

Theoretical challenges in understanding the inhibition mechanism of copper corrosion in acid media in the presence of three triazole derivatives

Using quantum chemical and molecular dynamics approaches, we investigated the corrosion inhibition mechanism of the Cu/HNO₃ system in the presence of three triazole derivatives.