Experimental and theoretical investigation on corrosion inhibition of hexamethylenetetramine [HMT] for mild steel in acidic solution

S. Aribo, S. J. Olusegun, G. L.S. Rodrigues, A. S. Ogunbadejo, B. Igbaroola, A. T. Alo, W. R. Rocha, N. D.S. Mohallem, P. A. Olubambi

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

This paper employs gravimetric, potentiodynamic polarization and SEM methods to study the corrosion inhibition of mild steel in 1 M solution of hydrochloric acid using hexamethylenetetramine as an inhibitor. The results show that inhibition efficiency increases with concentration up to 86% at 0.8 g L−1 inhibitor dosage. The data obtain are consistent with the isotherm proposed by Langmuir. The values of both activation and Gibbs free energy show that adsorption is physisorption and spontaneous. DFT quantum calculations also support a physisorption process which validates that nitrogen atoms are the most reactive and nucleophilic atoms, which is consistent with the experimental results.

Original languageEnglish
Pages (from-to)222-231
Number of pages10
JournalJournal of the Taiwan Institute of Chemical Engineers
Volume112
DOIs
Publication statusPublished - Jul 2020

Keywords

  • Acidic solution
  • Mild steel
  • Polarization
  • Quantum chemical calculations
  • SEM
  • Weight loss

ASJC Scopus subject areas

  • General Chemistry
  • General Chemical Engineering

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