article · Arabian Journal of Chemistry
A new hydrazone compound, designated as HTH, has been evaluated as an inhibitor to protect carbon steel from corrosion in acidic hydrochloric acid environments. Evaluation involved electrochemical techniques, chemical testing, and surface characterisation using scanning electron microscopy coupled with energy dispersion spectroscopy. The findings revealed that the compound acts as a mixed-type inhibitor, reaching an optimal inhibition efficiency of 98 percent at a concentration of 10-3 mol/L. Across a temperature range of 303 K to 333 K, the inhibitor maintained 89 percent protection efficiency, demonstrating high resistance to thermal variations. Surface examination confirmed that the molecule functions by creating a protective barrier on the steel. In addition, first-principles density functional theory and molecular dynamics simulations demonstrated that the compound adsorbs effectively on iron surfaces in a stable, parallel orientation.
Acid solutions cause rapid degradation of steel equipment, leading to material failure and substantial maintenance costs. Finding chemical additives that limit acid damage while resisting temperature increases is critical for industrial maintenance. This study identifies an organic compound capable of providing high levels of surface protection under both ambient and heated acidic conditions, helping inform more durable metal protection strategies.
The compound could serve as an additive to protect carbon steel components exposed to hydrochloric acid environments, which may interest chemical manufacturers or industrial cleaning operators. The work demonstrates laboratory-scale electrochemical efficacy and computational validation, indicating that the technology is currently at an early research stage and would require further scale-up, safety evaluation, and field testing before practical deployment.
AI-generated from the published abstract. Always read the original work before citing.
In the present work, a new hydrazone compound, namely N'-[(Z)-(4-chlorophenyl)methylidene]-2-(5-methoxy-2-methyl-1H-indol-3-yl)acetohydrazide, noted HTH, was selected to protect carbon steel against corrosion in 1.0 mol/L HCl. Different chemical, electrochemical, and surface characterization techniques such as scanning electron microscope coupled with X-ray energy dispersion (SEM/EDX) were used to investigate the corrosion inhibition performance. Electrochemical data showed that the effectiveness of the inhibitor improved with increasing concentration, reaching 98% at the optimal concentration of 10-3 mol/L. The results of potentiodynamic polarization measurements showed that hydrazone acted as a mixed-type inhibitor. The EIS results showed an increase in polarization resistance accompanied by a noticeable decrease in Ceff,dl values. In the temperature range of 303 K-333 K, hydrazone protected carbon steel by 89%, showing high resistance to temperature effect. The analysis of the steel surface by SEM/EDX confirmed that the effectiveness of the hydrazone was attributed to the formation of a protective layer on the surface of the metal. Quantum chemical calculations revealed insights into the chemical reactivity of the tested hydrazone while first-principles density functional theory (DFT) and molecular dynamics (MD) simulation supported the experimental conclusions and showed outstanding adsorption ability of HTH on the Fe(1 1 0) surface. First-principles DFT simulations showed that the HTH molecule was more stable in a parallel adsorption mode.
This page summarises published work. The authoritative version sits with the publisher.
DOI: 10.1016/j.arabjc.2023.104711
Is something wrong with this record? Report it or request removal.
Discussion
Have you built on this work, tried to replicate it, or seen it applied in practice? Share what you know. Verified researchers and MARATTO™ domain experts can open a discussion, and any member can reply. Contributions are reviewed before they appear.
No discussion yet. Open the first thread.
New to MARATTO™? Create a free account.
