Hassane LGAZ, PhD, MRSC

Associate Professor of Chemistry | Hanyang University ERICA, South Korea

Center for Creative Convergence Education; Innovative Durable Building and Infrastructure Research Center

Assessment of the inhibitive performance of a hydrazone derivative for steel rebar in a simulated concrete medium: Establishing the inhibition mechanism at an experimental and theoretical level

Journal article

Karthick Subbiah, Han-Seung Lee, Mustafa R. Al-Hadeethi, Taejoon Park, Hassane Lgaz
Chemical Engineering Journal, vol. 458, 2023

DOI: 10.1016/j.cej.2023.141347

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APA Click to copy
Subbiah, K., Lee, H.-S., Al-Hadeethi, M. R., Park, T., & Lgaz, H. (2023). Assessment of the inhibitive performance of a hydrazone derivative for steel rebar in a simulated concrete medium: Establishing the inhibition mechanism at an experimental and theoretical level. Chemical Engineering Journal, 458. https://doi.org/10.1016/j.cej.2023.141347

Chicago/Turabian Click to copy
Subbiah, Karthick, Han-Seung Lee, Mustafa R. Al-Hadeethi, Taejoon Park, and Hassane Lgaz. “Assessment of the Inhibitive Performance of a Hydrazone Derivative for Steel Rebar in a Simulated Concrete Medium: Establishing the Inhibition Mechanism at an Experimental and Theoretical Level.” Chemical Engineering Journal 458 (2023).

MLA Click to copy
Subbiah, Karthick, et al. “Assessment of the Inhibitive Performance of a Hydrazone Derivative for Steel Rebar in a Simulated Concrete Medium: Establishing the Inhibition Mechanism at an Experimental and Theoretical Level.” Chemical Engineering Journal, vol. 458, 2023, doi:10.1016/j.cej.2023.141347.

BibTeX Click to copy

@article{subbiah2023a,
  title = {Assessment of the inhibitive performance of a hydrazone derivative for steel rebar in a simulated concrete medium: Establishing the inhibition mechanism at an experimental and theoretical level},
  year = {2023},
  journal = {Chemical Engineering Journal},
  volume = {458},
  doi = {10.1016/j.cej.2023.141347},
  author = {Subbiah, Karthick and Lee, Han-Seung and Al-Hadeethi, Mustafa R. and Park, Taejoon and Lgaz, Hassane}
}

This is the author’s accepted manuscript of an article published in Ceramics International. The final published version is available at: https://doi.org/10.1016/j.cej.2023.141347

ABSTRACT: In the present work, a low-cost and practical approach based on an eco-friendly corrosion inhibitor is suggested for protecting steel rebar. To this end, a new hydrazone derivative, namely N'-(furan-2-ylmethylene)-2-(5-methoxy-2-methyl-1H-indol-3-yl) acetohydrazide (FMAH) was synthesized and its corrosion inhibition characteristics for steel rebar (STR) in chloride contaminated simulated concrete pore solutions (ClSCPS) were evaluated using experimental and theoretical methods. The electrochemical studies, which were conducted at several periods ranging from 1 h to 30 d indicated that the addition of FMAH to the ClSCPS significantly improved the passive film formation. It considerably increased film and charge transfer resistances at an early immersion stage, then decreased at longer immersion periods. Potentiodynamic polarization curves (PPCs) revealed that the investigated compound could be categorized as a mixed inhibitor with a predominance anodic effect. The gravimetric and potentiodynamic polarization studies confirmed corrosion inhibition efficiencies of 80.9% and 81.1%, respectively, for 1.0 mmol.L-1 FMAH after 30 d of exposure. Surface characterization of corroded and inhibited STR surface by X-ray photoelectron spectroscopy (XPS), SEM coupled with EDS, Raman spectroscopy, atomic force microscopy (AFM) and X-ray diffraction spectroscopy (XRD) revealed that inhibitor molecules chemically adsorbed on the STR forming a highly resistant protective layer against corrosive species. Theoretical modeling of inhibitor's adsorption on the iron surface by the self-consistent-charge Density-functional tight-binding (SCC-DFTB) indicated the formation of several covalent bonds between carbon and oxygen atoms with the iron atoms. The analysis of FMAH-Fe (1 1 0) adsorption systems by projected density of states revealed that FMAH molecules adsorbed on the iron surface through a charge transfer process. The interesting results from the present work would open great opportunities for exploring the anti-corrosion performance of the investigated compound in concrete.

KEYWORDS: Concrete pore solution; Corrosion inhibitor; Electrochemical studies; Hydrazone; Steel rebar

Charge density; Chlorine compounds; Concretes; Corrosion inhibitors; Corrosion protection; Density functional theory; Electrochemical corrosion; Iron; Molecules; Polarization; Steel corrosion; X ray photoelectron spectroscopy; Concrete pore solutions; Corrosion inhibition; Electrochemical studies; Hydrazone derivative; Hydrazones; Inhibition mechanisms; Iron surface; Performance; Simulated concrete pore solution; Steel rebars; Charge transfer