Experimental and theoretical studies of Schiff bases as corrosion inhibitors

Dalia M. Jamil, Ahmed K. Al-Okbi, Shaimaa B. Al-Baghdadi, Ahmed A. Al-Amiery, Abdulhadi Kadhim, Tayser Sumer Gaaz, Abdul Amir H. Kadhum, Abu Bakar Mohamad

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Background: Relatively inexpensive, stable Schiff bases, namely 3-((4-hydroxybenzylidene)amino)-2-methylquinazolin-4(3H)-one (BZ3) and 3-((4-(dimethylamino)benzylidene)amino)-2-methylquinazolin-4(3H)-one (BZ4), were employed as highly efficient inhibitors of mild steel corrosion by corrosive acid. Findings: The inhibition efficiencies were estimated based on weight loss method. Moreover, scanning electron microscopy was used to investigate the inhibition mechanism. The synthesized Schiff bases were characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy and micro-elemental analysis. The inhibition efficiency depends on three factors: the amount of nitrogen in the inhibitor, the inhibitor concentration and the inhibitor molecular weight. Conclusions: Inhibition efficiencies of 96 and 92% were achieved with BZ4 and BZ3, respectively, at the maximum tested concentration. Density functional theory calculations of BZ3 and BZ4 were performed to compare the effects of hydroxyl and N,N-dimethylamino substituents on the inhibition efficiency, providing insight for designing new molecular structures that exhibit enhanced inhibition efficiencies.

Original languageEnglish
Article number7
JournalChemistry Central Journal
Volume12
Issue number1
DOIs
Publication statusPublished - 5 Feb 2018

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Schiff Bases
Corrosion inhibitors
Caustics
Steel corrosion
Hydroxyl Radical
Molecular structure
Nuclear magnetic resonance spectroscopy
Carbon steel
Density functional theory
Nitrogen
Molecular weight
Scanning electron microscopy
Acids
Chemical analysis

Keywords

  • Corrosion inhibitors
  • DFT
  • NMR
  • Schiff bases
  • SEM

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Jamil, D. M., Al-Okbi, A. K., Al-Baghdadi, S. B., Al-Amiery, A. A., Kadhim, A., Gaaz, T. S., ... Mohamad, A. B. (2018). Experimental and theoretical studies of Schiff bases as corrosion inhibitors. Chemistry Central Journal, 12(1), [7]. https://doi.org/10.1186/s13065-018-0376-7

Experimental and theoretical studies of Schiff bases as corrosion inhibitors. / Jamil, Dalia M.; Al-Okbi, Ahmed K.; Al-Baghdadi, Shaimaa B.; Al-Amiery, Ahmed A.; Kadhim, Abdulhadi; Gaaz, Tayser Sumer; Kadhum, Abdul Amir H.; Mohamad, Abu Bakar.

In: Chemistry Central Journal, Vol. 12, No. 1, 7, 05.02.2018.

Research output: Contribution to journalArticle

Jamil DM, Al-Okbi AK, Al-Baghdadi SB, Al-Amiery AA, Kadhim A, Gaaz TS et al. Experimental and theoretical studies of Schiff bases as corrosion inhibitors. Chemistry Central Journal. 2018 Feb 5;12(1). 7. https://doi.org/10.1186/s13065-018-0376-7
Jamil, Dalia M. ; Al-Okbi, Ahmed K. ; Al-Baghdadi, Shaimaa B. ; Al-Amiery, Ahmed A. ; Kadhim, Abdulhadi ; Gaaz, Tayser Sumer ; Kadhum, Abdul Amir H. ; Mohamad, Abu Bakar. / Experimental and theoretical studies of Schiff bases as corrosion inhibitors. In: Chemistry Central Journal. 2018 ; Vol. 12, No. 1.
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