Corrosion inhibition by 1-hydroxy-ethane-1,1-diphosphonic acid. An electrochemical impedance spectroscopy study

E. Kálmán, B. Varhegyi, I. Bakó, I. Felhősi, F. H. Karman, A. Shaban

Research output: Contribution to journalArticle

93 Citations (Scopus)

Abstract

Impedance spectra of carbon steel in the presence of 1-hydroxy-ethane-1,1-diphosphonic acid (HEDP) has been investigated in neutral solutions. The aim of the measurements was to study the effect of HEDP on the carbon steel corrosion as a function of inhibitor concentration. An optimal inhibitor concentration was found to be approximately 10-4 mol dm-3. A two-time constant equivalent circuit model including a constant phase element was consistent with experimental data in the frequency range studied. The system parameters obtained by a nonlinear fit procedure are discussed in terms of the model used. Inhibitor efficiencies derived from impedance data are compared with those obtained from polarization and weight loss measurements. Results of these investigations show that at low concentrations, HEDP inhibits carbon steel corrosion by a precipitation mechanism forming insoluble iron complexes and repairing the porous oxide layer formed on the metal surface. Increasing HEDP concentration beyond the optimal value decreases its inhibition efficiency due to the dissolution of the oxide layer.

Original languageEnglish
Pages (from-to)3357-3360
Number of pages4
JournalJournal of the Electrochemical Society
Volume141
Issue number12
Publication statusPublished - Dec 1994

Fingerprint

Ethane
Electrochemical impedance spectroscopy
ethane
carbon steels
corrosion
impedance
inhibitors
Corrosion
Carbon steel
Steel corrosion
acids
Acids
Oxides
spectroscopy
oxides
Corrosion inhibitors
equivalent circuits
Equivalent circuits
time constant
maintenance

ASJC Scopus subject areas

  • Electrochemistry
  • Surfaces, Coatings and Films
  • Surfaces and Interfaces

Cite this

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title = "Corrosion inhibition by 1-hydroxy-ethane-1,1-diphosphonic acid. An electrochemical impedance spectroscopy study",
abstract = "Impedance spectra of carbon steel in the presence of 1-hydroxy-ethane-1,1-diphosphonic acid (HEDP) has been investigated in neutral solutions. The aim of the measurements was to study the effect of HEDP on the carbon steel corrosion as a function of inhibitor concentration. An optimal inhibitor concentration was found to be approximately 10-4 mol dm-3. A two-time constant equivalent circuit model including a constant phase element was consistent with experimental data in the frequency range studied. The system parameters obtained by a nonlinear fit procedure are discussed in terms of the model used. Inhibitor efficiencies derived from impedance data are compared with those obtained from polarization and weight loss measurements. Results of these investigations show that at low concentrations, HEDP inhibits carbon steel corrosion by a precipitation mechanism forming insoluble iron complexes and repairing the porous oxide layer formed on the metal surface. Increasing HEDP concentration beyond the optimal value decreases its inhibition efficiency due to the dissolution of the oxide layer.",
author = "E. K{\'a}lm{\'a}n and B. Varhegyi and I. Bak{\'o} and I. Felhősi and Karman, {F. H.} and A. Shaban",
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T1 - Corrosion inhibition by 1-hydroxy-ethane-1,1-diphosphonic acid. An electrochemical impedance spectroscopy study

AU - Kálmán, E.

AU - Varhegyi, B.

AU - Bakó, I.

AU - Felhősi, I.

AU - Karman, F. H.

AU - Shaban, A.

PY - 1994/12

Y1 - 1994/12

N2 - Impedance spectra of carbon steel in the presence of 1-hydroxy-ethane-1,1-diphosphonic acid (HEDP) has been investigated in neutral solutions. The aim of the measurements was to study the effect of HEDP on the carbon steel corrosion as a function of inhibitor concentration. An optimal inhibitor concentration was found to be approximately 10-4 mol dm-3. A two-time constant equivalent circuit model including a constant phase element was consistent with experimental data in the frequency range studied. The system parameters obtained by a nonlinear fit procedure are discussed in terms of the model used. Inhibitor efficiencies derived from impedance data are compared with those obtained from polarization and weight loss measurements. Results of these investigations show that at low concentrations, HEDP inhibits carbon steel corrosion by a precipitation mechanism forming insoluble iron complexes and repairing the porous oxide layer formed on the metal surface. Increasing HEDP concentration beyond the optimal value decreases its inhibition efficiency due to the dissolution of the oxide layer.

AB - Impedance spectra of carbon steel in the presence of 1-hydroxy-ethane-1,1-diphosphonic acid (HEDP) has been investigated in neutral solutions. The aim of the measurements was to study the effect of HEDP on the carbon steel corrosion as a function of inhibitor concentration. An optimal inhibitor concentration was found to be approximately 10-4 mol dm-3. A two-time constant equivalent circuit model including a constant phase element was consistent with experimental data in the frequency range studied. The system parameters obtained by a nonlinear fit procedure are discussed in terms of the model used. Inhibitor efficiencies derived from impedance data are compared with those obtained from polarization and weight loss measurements. Results of these investigations show that at low concentrations, HEDP inhibits carbon steel corrosion by a precipitation mechanism forming insoluble iron complexes and repairing the porous oxide layer formed on the metal surface. Increasing HEDP concentration beyond the optimal value decreases its inhibition efficiency due to the dissolution of the oxide layer.

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