ELECTROCHEMICAL AND THEORETICAL STUDIES INFLUENCING THE EFFECT OF HYDROXYL POSITION OF TETRAPHENOLIC SCHIFF BASES TOWARDS CORROSION INHIBITION OF MILD STEEL IN 1M HCL

Authors

  • A. Kheniche Laboratoire des matériaux inorganiques (LMI), Université Mohamed Boudiaf- M’sila 28003 http://orcid.org/0000-0003-1625-3515
  • A. Ourari Laboratoire d’Electrochimie, d’Ingénierie Moléculaire et de Catalyse Redox (LEIMCR), Faculté de Technologie, Université Ferhat ABBAS Sétif-1, Maabouda, Route de Béjaia, 19000
  • A. Dakhouche Laboratoire des matériaux inorganiques (LMI), Université Mohamed Boudiaf- M’sila 28003
  • A. Ghanem Laboratoire des matériaux inorganiques (LMI), Université Mohamed Boudiaf- M’sila 28003
  • W. Min
  • K. Meguellati

DOI:

https://doi.org/10.4314/jfas.v10i3.16

Keywords:

Mild steel, Tetrahydroxylated H2Salen, Corrosion inhibitors, AFM and SEM images, DFT-calculations and molecular dynamic simulations.

Abstract

Three Schiff bases, derived from N,N-bis(salicylidene)-4,4’-diphenylmethane in which second hydroxyl, is introduced in 3,4 and 5 positions of salicylaldehyde were synthesized, characterized and studied as inhibitors for mild steel in 1M HCl medium. The experiments were performed using potentiodynamic polarization. This inhibition proved an efficient increase according the position of second hydroxyl of salicylaldehyde suggesting that this inhibition is dependent on concentration and the compound nature. Among these position-isomers, the best inhibition efficiency was obtained with p-hydroxylated (94%) at 1mM. Tafel plots of these inhibitors are the mixed- type, their adsorption is spontaneous obeying to Langmuir’s isotherm. AFM/SEM-EDS characterized metal surface. DFT-calculations and molecular dynamics simulations are correlated to inhibition efficiency obtained.

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Published

2018-09-01

Issue

Vol. 10 No. 3 (2018)

Section

Research Articles

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