The impedance characteristics of protective corrosion films on carbon steel in an alkaline sour medium

R. Cabrera-Sierra, E. Sosa, M. A. Pech-Canul, I. González

Research output: Contribution to conferencePaper

11 Citations (Scopus)

Abstract

A physical model describing the impedance response of iron deficient (Fe1-xS) iron sulfide films in alkaline sour solutions has been developed. It assumes that the faradaic impedance of the anodic reaction was dominated by the transport of cation vacancies, which are created at the film/solution interface and annihilated at the metal/film interface. Simulations showed that the model is sensitive, in the typical frequency range used in EIS measurements, to variations in the values of the diffusion coefficient of cation vacancies and the rate constants of the reaction at the metal/film interface. A typical impedance diagram for FexSy films in a 0.1 M (NH4)2S, 10 ppm CN- solutions was compared to a calculated diagram using the model equations. Qualitatively, there is a good agreement between the model and experimental data, and the parameters make physical sense. © 2005 Elsevier Ltd. All rights reserved.
Original languageAmerican English
Pages1534-1540
Number of pages1379
DOIs
StatePublished - 20 Jan 2006
Externally publishedYes
EventElectrochimica Acta -
Duration: 20 Jan 2006 → …

Conference

ConferenceElectrochimica Acta
Period20/01/06 → …

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Corrosion
Steel
Electric Impedance
Carbon
Cations
Iron
Metals
Sulfides
Theoretical Models

Cite this

Cabrera-Sierra, R. ; Sosa, E. ; Pech-Canul, M. A. ; González, I. / The impedance characteristics of protective corrosion films on carbon steel in an alkaline sour medium. Paper presented at Electrochimica Acta, .1379 p.
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Cabrera-Sierra, R, Sosa, E, Pech-Canul, MA & González, I 2006, 'The impedance characteristics of protective corrosion films on carbon steel in an alkaline sour medium', Paper presented at Electrochimica Acta, 20/01/06 pp. 1534-1540. https://doi.org/10.1016/j.electacta.2005.02.132

The impedance characteristics of protective corrosion films on carbon steel in an alkaline sour medium. / Cabrera-Sierra, R.; Sosa, E.; Pech-Canul, M. A.; González, I.

2006. 1534-1540 Paper presented at Electrochimica Acta, .

Research output: Contribution to conferencePaper

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N2 - A physical model describing the impedance response of iron deficient (Fe1-xS) iron sulfide films in alkaline sour solutions has been developed. It assumes that the faradaic impedance of the anodic reaction was dominated by the transport of cation vacancies, which are created at the film/solution interface and annihilated at the metal/film interface. Simulations showed that the model is sensitive, in the typical frequency range used in EIS measurements, to variations in the values of the diffusion coefficient of cation vacancies and the rate constants of the reaction at the metal/film interface. A typical impedance diagram for FexSy films in a 0.1 M (NH4)2S, 10 ppm CN- solutions was compared to a calculated diagram using the model equations. Qualitatively, there is a good agreement between the model and experimental data, and the parameters make physical sense. © 2005 Elsevier Ltd. All rights reserved.

AB - A physical model describing the impedance response of iron deficient (Fe1-xS) iron sulfide films in alkaline sour solutions has been developed. It assumes that the faradaic impedance of the anodic reaction was dominated by the transport of cation vacancies, which are created at the film/solution interface and annihilated at the metal/film interface. Simulations showed that the model is sensitive, in the typical frequency range used in EIS measurements, to variations in the values of the diffusion coefficient of cation vacancies and the rate constants of the reaction at the metal/film interface. A typical impedance diagram for FexSy films in a 0.1 M (NH4)2S, 10 ppm CN- solutions was compared to a calculated diagram using the model equations. Qualitatively, there is a good agreement between the model and experimental data, and the parameters make physical sense. © 2005 Elsevier Ltd. All rights reserved.

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