article · Journal of environmental chemical engineering
Industrial metal protection often relies on chemical inhibitors to limit degradation in aggressive acidic environments. An organic molecule, designated as KO38, was evaluated for its ability to shield steel, aluminium, and copper exposed to a one molar hydrochloric acid solution. Laboratory assessments using electrochemical polarisation and scanning electron microscopy demonstrated that the compound acts as a mixed-type inhibitor, simultaneously suppressing both anodic and cathodic corrosion processes. At a concentration of 10^-4 molar, the compound attained a maximum protection capacity between 96% and 97% across all three metals. Molecular dynamic simulations and density functional theory calculations revealed the adsorption behaviour and energetic interactions between the inhibitor molecule and the metal surfaces. These computational models showed strong alignment with the experimental corrosion inhibition measurements.
Acidic corrosion causes severe degradation in industrial infrastructure made from common alloys such as steel, copper, and aluminium. Demonstrating that a single organic compound can achieve over 96% inhibition efficiency across three distinct metals provides valuable insights into multi-metal protection, while validated computational simulations help streamline the future evaluation of protective chemical coatings.
This work could support the formulation of multi-metal corrosion inhibitor additives for industries that expose steel, copper, or aluminium to strong acids. Potential users include chemical formulators and industrial plant maintenance teams. The technology appears to be at an early laboratory stage, having demonstrated effectiveness in small-scale electrochemical tests and computational simulations without reporting pilot-scale trials or commercial synthesis routes.
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Corrosion prevention of metals like Steel, Aluminum, and Copper is an interesting problem in industries, to solve this problem corrosion inhibitors are one of the most effective applications for metal protection against corrosion in aggressive media. The effect of (2E)-3-(6-phenylimidazo[2,1-b][1,3]thiazol-5-yl)-1-(2,4,6-trimethylphenyl)prop-2-en- 1-one (KO38) on the protection of steel, aluminum, and copper in 1 M HCl medium was examined using electrochemical polarization tests to assess inhibition efficiency, also scanning electron microscopy (SEM) to analyze the surface of metals. The maximum protection capacity of KO38 by the method of polarization is between 96% and 97% for the three metals exposed in an acid solution containing 10−4 M. The organic inhibitors can be classified as mixed-type inhibitors since they inhibited both anodic corrosion and cathodic corrosion. The study of the dynamic simulation (DM) helped to visualize the energies of adsorption of the molecule (KO38) on the interfaces of Iron (110), Aluminum (111), and Copper (111), the calculations of quantum chemistry were analyzed by (DFT) at B-3LYP /6–311 G (d, p). The experimental results are in good agreement with the theoretical studies.
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DOI: 10.1016/j.jece.2023.109642
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