Abstract
Background The acid corrosion inhibition process of mild steel in 1 M HCl by 4-[(2-amino-1, 3, 4-thiadiazol-5-yl)methoxy]coumarin (ATC), has been investigated using weight loss technique and scanning electron microscopy (SEM). ATC was synthesized, and its chemical structure was elucidated and confirmed using spectroscopic techniques (infrared and nuclear magnetic resonance spectroscopy).FindingsThe results indicated that inhibition efficiencies were enhanced with an increase in concentration of inhibitor and decreased with a rise in temperature. The adsorption equilibrium constant (K) and standard free energy of adsorption (ΔGads) were calculated. Quantum chemical parameters such as highest occupied molecular orbital energy, lowest unoccupied molecular orbital energy (EHOMO and ELUMO, respectively) and dipole moment (μ) were calculated and discussed. The results showed that the corrosion inhibition efficiency increased with an increase in both the EHOMO and μ values but with a decrease in the ELUMO value.ConclusionsOur research show that the synthesized macromolecule represents an excellent inhibitor for materials in acidic solutions. The efficiency of this macromolecule had maximum inhibition efficiency up to 96 % at 0.5 mM and diminishes with a higher temperature degree, which is revealing of chemical adsorption. An inhibitor molecule were absorbed by metal surface and follow Langmuir isotherms low and establishes an efficient macromolecule inhibitor having excellent inhibitive properties due to entity of S (sulfur) atom, N (nitrogen) atom and O (oxygen) atom.
Highlights
The acid corrosion inhibition process of mild steel in 1 M HCl by 4-[(2-amino-1, 3, 4-thiadiazol-5-yl) methoxy]coumarin (ATC), has been investigated using weight loss technique and scanning electron microscopy (SEM)
The efficiency of this macromolecule had maximum inhibition efficiency up to 96 % at 0.5 mM and diminishes with a higher temperature degree, which is revealing of chemical adsorption
An inhibitor molecule were absorbed by metal surface and follow Langmuir isotherms low and establishes an efficient macromolecule inhibitor having excellent inhibitive properties due to entity of S atom, N atom and O atom
Summary
The acid corrosion inhibition process of mild steel in 1 M HCl by 4-[(2-amino-1, 3, 4-thiadiazol-5-yl) methoxy]coumarin (ATC), has been investigated using weight loss technique and scanning electron microscopy (SEM). The majority of well-known acid inhibitors are organic compounds that contain nitrogen, sulfur and oxygen atoms. Nowadays researchers go for coumarins to used as corrosion inhibitors due to the electronic structure, planarity, lone pairs of electrons present on oxygen and stability [15–17]. Organic inhibitors decreasing the corrosion rate by adsorbing onto the surface of the metal through the active sites namely phosphorus, sulfur, oxygen, nitrogen atoms or pi-bonds [18]. The quantum chemical computations based on density function theory (DFT) become powerful investigation theoretical tool for researchers to investigate the ability of organic molecules as corrosion inhibitions. This tool offers a glance at physical insights on corrosion inhibition mechanisms [19]. We were starting from 4-hydroxycoumarin as starting material for the synthesis of 4-[(2-amino-1, 3, 4-thiadiazol-5-yl)methoxy]coumarin (ATC) contain 1, 3, 4-thiadiazol moiety
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