Experimental and theoretical studies of 2‐amino thiazole as an inhibitor for carbon steel corrosion in hydrochloric acid

Abstract

The corrosion inhibition of 2‐amino thiazole (AT) for 45# steel in 0.1 M HCl solution was studied by means of weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM) methods. Quantum chemical calculations based on the density functional theory (DFT) method were performed on AT. The results showed that the corrosion inhibition efficiency of 2‐amino thiazole was excellent, and its corrosion inhibition efficiency could reach 90.34% at 500 mg/L. The results obtained from the weight loss experiment and electrochemical experiments were in good agreement. Potentiodynamic polarization study showed that the 2‐amino thiazole was a mixed‐type inhibitor. And the slow‐release process was controlled by electro transfer steps. The electronic properties obtained by quantum chemical approach were correlated with the experiment results.

Electrochemistry of carbon dioxide corrosion mitigation using tall oil diethylenetriamine imidazoline as corrosion inhibitor for mild steel

“…At potentials higher than −0.4 V versus Ag/AgCl, the change of slope of the anodic curve and the increase of anodic current density are observed. This behavior was already reported for iron and can be explained by desorption of adsorbed inhibitor molecules and the decrease of the degree of coverage of the electrode surface with increasing anodic potential . Desorption from the metal surface upon anode polarization is typical for many organic compounds, including imidazolines .…”

The thiazole and triazole derivatives as inhibitors of metal corrosion: Part I

“…Inhibitorsko dejstvo 2-aminotiazola na koroziju ugljeničnog čelika u 0,1 mol dm -3 rastvoru HCl proučava i F.Y.Cui [10] primenom različitih eksperimentalnih tehnika kao i kvantno-hemijskim proračunima. Na osnovu rezultata zaključuje da se u opsegu koncentracija od 200 mg dm -3 -600 mg dm -3 ovo jedinjenje ponaša kao mešoviti inhibitor koji svoje zaštitno dejtvo ostvaruje putem spontane fizičke adsorpcije (po Langmirovoj izotermi) na površinu čelika, što dovodi do značajnog povećanja otpora prenosu naelektrisanja u odnosu na korozionu sredinu.…”

Adsorption Effect of Five‐Membered and Six‐Membered Alicyclic Amine‐Derived Mannich Bases on Mild Steel Surface in 1.0 M HCl

“…The structural parameters can be obtained from the quantum chemical studies. The stable conformation of the structure in the ground sate and the nature of the molecular orbitals will give valuable information of the inhibition effect of the inhibitor . Quantum chemical studies are correlated with the experimental results with respect to the corrosion inhibition.…”