Jump to main content
Jump to site search

Issue 74, 2017
Previous Article Next Article

Synthesis, characterization and corrosion inhibition potential of two novel Schiff bases on mild steel in acidic medium

Author affiliations

Abstract

The present study deals with the synthesis of two novel Schiff bases (SBs) namely; 5-((4-chloro-3-nitrophenylimino)methyl)-2-methoxyphenol (SB-1) and 2-(4-hydroxy-3-methoxybenzylidineamino)-4-nitrophenol (SB-2) using a solid–liquid phase equilibrium diagram and their characterization via 1H and 13C NMR, FT-IR and UV-vis spectral analyses. Differential scanning calorimetric (DSC) thermographs were also obtained to further support the synthesis and identify the melting temperatures of SB-1 and SB-2. The XRD technique was employed to study the atomic packing, crystal structure and space group of the grown crystals of SB-1. Results showed that powder X-ray diffraction patterns of both SBs are entirely different than those of their corresponding starting compounds. The inhibition properties of the investigated SBs were evaluated for mild steel corrosion in 1 M HCl using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP) and computational (DFT) methods. Electrochemical and DFT studies revealed that the tested SBs act as good inhibitors for acidic corrosion of mild steel and their efficiency increases (η%) on increasing their concentrations. Electrochemical results revealed that SB-1 and SB-2 showed maximum inhibition efficiencies of 95.58% and 96.80%, respectively, at a concentration as low as 0.327 mM. Results from a polarization study suggest that the studied SBs act as mixed type corrosion inhibitors with some cathodic predominance. The DFT based parameters such as EHOMO, ELUMO, ΔE, electronegativity (χ), hardness (η), softness (σ) and the fraction of electron transfer (ΔN) were calculated to corroborate the experimentally obtained results. Both experimental and DFT results were in good agreement.

Graphical abstract: Synthesis, characterization and corrosion inhibition potential of two novel Schiff bases on mild steel in acidic medium

Back to tab navigation

Supplementary files

Article information


Submitted
11 Aug 2017
Accepted
25 Sep 2017
First published
05 Oct 2017

This article is Open Access

RSC Adv., 2017,7, 47148-47163
Article type
Paper

Synthesis, characterization and corrosion inhibition potential of two novel Schiff bases on mild steel in acidic medium

A. Pandey, B. Singh, C. Verma and E. E. Ebenso, RSC Adv., 2017, 7, 47148
DOI: 10.1039/C7RA08887F

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material.

Reproduced material should be attributed as follows:

  • For reproduction of material from NJC:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC.
  • For reproduction of material from PCCP:
    [Original citation] - Published by the PCCP Owner Societies.
  • For reproduction of material from PPS:
    [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC.
  • For reproduction of material from all other RSC journals:
    [Original citation] - Published by The Royal Society of Chemistry.

Information about reproducing material from RSC articles with different licences is available on our Permission Requests page.


Social activity

Search articles by author

Spotlight

Advertisements