Adsorption isotherm mechanism of amino organic compounds as mild steel corrosion inhibitors by electrochemical measurement method

A. Y. Musa, Abdul Amir H. Kadhum, Abu Bakar Mohamad, Mohd Sobri Takriff, A. R. Daud, Siti Kartom Kamarudin

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The inhibition ability of 4-amino-5-phenyl-4H-1, 2, 4-trizole-3-thiol (APTT), ethylenediaminetetra-acetic acid (EDTA) and thiourea (TU) for mild steel corrosion in 1.0 mol/L HCl solution at 30 °C was investigated. Tafel polarization and electrochemical impedance spectroscopy (EIS) were used to investigate the influence of these organic compounds as corrosion inhibitors of mild steel in 1.0 mol/L HCl solution at 30 °C. The inhibition mechanism was discussed in terms of Langmuir isotherm model. Results obtained from Tafel polarization and impedance measurements are in a good agreement. The inhibition efficiency increases with the increase of the inhibitor concentration. The adsorption of the inhibitors on the mild steel surface follows Langmuir adsorption isotherm and the free energy of adsorption ΔG ads indicates that the adsorption of APTT, EDTA, and TU molecules is a spontaneous process and a typical chemisorption.

Original languageEnglish
Pages (from-to)34-39
Number of pages6
JournalJournal of Central South University of Technology (English Edition)
Volume17
Issue number1
DOIs
Publication statusPublished - Feb 2010

Fingerprint

Steel corrosion
Corrosion inhibitors
Adsorption isotherms
Organic compounds
Carbon steel
Thiourea
Thioureas
Adsorption
Acetic acid
Acetic Acid
Polarization
Chemisorption
Electrochemical impedance spectroscopy
Sulfhydryl Compounds
Free energy
Isotherms
Molecules

Keywords

  • Corrosion inhibitor
  • Langmuir adsorption isotherm
  • Mild steel

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Adsorption isotherm mechanism of amino organic compounds as mild steel corrosion inhibitors by electrochemical measurement method. / Musa, A. Y.; Kadhum, Abdul Amir H.; Mohamad, Abu Bakar; Takriff, Mohd Sobri; Daud, A. R.; Kamarudin, Siti Kartom.

In: Journal of Central South University of Technology (English Edition), Vol. 17, No. 1, 02.2010, p. 34-39.

Research output: Contribution to journalArticle

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AU - Daud, A. R.

AU - Kamarudin, Siti Kartom

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AB - The inhibition ability of 4-amino-5-phenyl-4H-1, 2, 4-trizole-3-thiol (APTT), ethylenediaminetetra-acetic acid (EDTA) and thiourea (TU) for mild steel corrosion in 1.0 mol/L HCl solution at 30 °C was investigated. Tafel polarization and electrochemical impedance spectroscopy (EIS) were used to investigate the influence of these organic compounds as corrosion inhibitors of mild steel in 1.0 mol/L HCl solution at 30 °C. The inhibition mechanism was discussed in terms of Langmuir isotherm model. Results obtained from Tafel polarization and impedance measurements are in a good agreement. The inhibition efficiency increases with the increase of the inhibitor concentration. The adsorption of the inhibitors on the mild steel surface follows Langmuir adsorption isotherm and the free energy of adsorption ΔG ads indicates that the adsorption of APTT, EDTA, and TU molecules is a spontaneous process and a typical chemisorption.

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