The influence of halide ions on the passivity breakdown of carbon steel based on the point defect model

Elmira Ghanbari; Alireeza Saatchi; Danyil Kovalov; Bruno Kursten; Digby D. Macdonald

The influence of halide ions on the passivity breakdown of carbon steel based on the point defect model

Elmira Ghanbari, Alireeza Saatchi, Danyil Kovalov, Bruno Kursten, Digby D. Macdonald

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Abstract

An important factor in determining the breakdown of the barrier layer of the passive film on carbon steel in halide-containing solutions is the anion size. In this study, the influence of the size of aggressive anions on the passivity breakdown of UNS K02700 grade carbon steel exposed to saturated Ca(OH)2 solutions with the addition of different halides was investigated by using the potentiodynamic polarization (PDP) experiments. The PDP results were interpreted by using a mechanistic description based on the Point Defect Model (PDM). The experimental results revealed a linear dependence of the critical breakdown potential (Ec) on the logarithm of the activity of the breakdown-inducing halide (F-, Cl-, Br-, and I-), as predicted by the PDM. Furthermore, the PDM successfully accounted for the order with which the halides induce passivity breakdown, F- < Cl- > Br- > I-, in terms of competitive Gibbs free energy of anion dehydration and expansion of surface oxygen vacancies, into which the halide must absorb as the initial event in the breakdown process.

Original language	English
Title of host publication	NACE - International Corrosion Conference Series
Publisher	NACE International
Pages	1-8
Number of pages	8
Edition	2018
ISBN (Print)	978-151086440-5
State	Published - 16 Apr 2018
Event	2018 - CORROSION: Conference & Expo - Phoenix Convention Center, Phoenix Duration: 15 Apr 2018 → 19 Apr 2018 http://events.nace.org/WA/corrosion/c2018/index.html

Conference

Conference	2018 - CORROSION
Country/Territory	United States
City	Phoenix
Period	2018-04-15 → 2018-04-19
Internet address	http://events.nace.org/WA/corrosion/c2018/index.html

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Cite this

Ghanbari, E., Saatchi, A., Kovalov, D., Kursten, B., & Macdonald, D. D. (2018). The influence of halide ions on the passivity breakdown of carbon steel based on the point defect model. In NACE - International Corrosion Conference Series (2018 ed., pp. 1-8). Article 11025 NACE International. https://store.nace.org/the-influence-of-halide-ions-on-the-passivity-breakdown-of-carbon-steel-based-on-the-point-defect-mo-2

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title = "The influence of halide ions on the passivity breakdown of carbon steel based on the point defect model",

abstract = "An important factor in determining the breakdown of the barrier layer of the passive film on carbon steel in halide-containing solutions is the anion size. In this study, the influence of the size of aggressive anions on the passivity breakdown of UNS K02700 grade carbon steel exposed to saturated Ca(OH)2 solutions with the addition of different halides was investigated by using the potentiodynamic polarization (PDP) experiments. The PDP results were interpreted by using a mechanistic description based on the Point Defect Model (PDM). The experimental results revealed a linear dependence of the critical breakdown potential (Ec) on the logarithm of the activity of the breakdown-inducing halide (F-, Cl-, Br-, and I-), as predicted by the PDM. Furthermore, the PDM successfully accounted for the order with which the halides induce passivity breakdown, F- < Cl- > Br- > I-, in terms of competitive Gibbs free energy of anion dehydration and expansion of surface oxygen vacancies, into which the halide must absorb as the initial event in the breakdown process.",

keywords = "Passivity breakdown, Point defect model, Halide ion size",

author = "Elmira Ghanbari and Alireeza Saatchi and Danyil Kovalov and Bruno Kursten and Macdonald, {Digby D.}",

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Ghanbari, E, Saatchi, A, Kovalov, D, Kursten, B & Macdonald, DD 2018, The influence of halide ions on the passivity breakdown of carbon steel based on the point defect model. in NACE - International Corrosion Conference Series. 2018 edn, 11025, NACE International, pp. 1-8, 2018 - CORROSION, Phoenix, Arizona, United States, 2018-04-15. <https://store.nace.org/the-influence-of-halide-ions-on-the-passivity-breakdown-of-carbon-steel-based-on-the-point-defect-mo-2>

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T1 - The influence of halide ions on the passivity breakdown of carbon steel based on the point defect model

AU - Ghanbari, Elmira

AU - Saatchi, Alireeza

AU - Kovalov, Danyil

AU - Kursten, Bruno

AU - Macdonald, Digby D.

N1 - Score=3

PY - 2018/4/16

Y1 - 2018/4/16

N2 - An important factor in determining the breakdown of the barrier layer of the passive film on carbon steel in halide-containing solutions is the anion size. In this study, the influence of the size of aggressive anions on the passivity breakdown of UNS K02700 grade carbon steel exposed to saturated Ca(OH)2 solutions with the addition of different halides was investigated by using the potentiodynamic polarization (PDP) experiments. The PDP results were interpreted by using a mechanistic description based on the Point Defect Model (PDM). The experimental results revealed a linear dependence of the critical breakdown potential (Ec) on the logarithm of the activity of the breakdown-inducing halide (F-, Cl-, Br-, and I-), as predicted by the PDM. Furthermore, the PDM successfully accounted for the order with which the halides induce passivity breakdown, F- < Cl- > Br- > I-, in terms of competitive Gibbs free energy of anion dehydration and expansion of surface oxygen vacancies, into which the halide must absorb as the initial event in the breakdown process.

AB - An important factor in determining the breakdown of the barrier layer of the passive film on carbon steel in halide-containing solutions is the anion size. In this study, the influence of the size of aggressive anions on the passivity breakdown of UNS K02700 grade carbon steel exposed to saturated Ca(OH)2 solutions with the addition of different halides was investigated by using the potentiodynamic polarization (PDP) experiments. The PDP results were interpreted by using a mechanistic description based on the Point Defect Model (PDM). The experimental results revealed a linear dependence of the critical breakdown potential (Ec) on the logarithm of the activity of the breakdown-inducing halide (F-, Cl-, Br-, and I-), as predicted by the PDM. Furthermore, the PDM successfully accounted for the order with which the halides induce passivity breakdown, F- < Cl- > Br- > I-, in terms of competitive Gibbs free energy of anion dehydration and expansion of surface oxygen vacancies, into which the halide must absorb as the initial event in the breakdown process.

KW - Passivity breakdown

KW - Point defect model

KW - Halide ion size

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SN - 978-151086440-5

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BT - NACE - International Corrosion Conference Series

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Y2 - 15 April 2018 through 19 April 2018

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