In situ and ex situ characterisation of the passive film on a ferritic stainless steel in molten sodium hydroxide

Javor Kolchakov, Tzvety Tzvetkoff, Martin Bojinov (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

Voltammetric and electrochemical impedance spectroscopic measurements in combination with ex situ surface analysis are used to characterise the passive state of Fe–18% Cr in molten NaOH at 470 °C. The areas of corrosion, passivity and transpassivity are derived from experimental voltammetric data and thermodynamic considerations. Impedance measurements in a wide potential range are performed to study the conductivity mechanism of the anodic layers formed. The surface composition of the passive film is estimated by X-ray photoelectron spectroscopy and its in-depth composition by Auger electron spectroscopy. A transfer function based on a tentative kinetic model is proposed to describe the impedance spectra. The parameters of the transfer function are determined by best-fit calculation and some of the kinetic and transport parameters characterising the film growth process are estimated.
Original languageEnglish
Pages (from-to)162 - 175
Number of pages14
JournalApplied Surface Science
Volume249
Issue number1-4
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

Fingerprint

Sodium Hydroxide
Stainless Steel
Ferritic steel
Transfer functions
Molten materials
Stainless steel
Sodium
Kinetics
Surface analysis
Film growth
Auger electron spectroscopy
Surface structure
X ray photoelectron spectroscopy
Thermodynamics
Corrosion
Chemical analysis

Keywords

  • stainless steel
  • molten hydroxide
  • passive film
  • electrochemical impedance spectroscopy
  • surface analysis
  • kinetic model
  • surface treatment
  • X-ray photoelectron spectroscopy

Cite this

Kolchakov, Javor ; Tzvetkoff, Tzvety ; Bojinov, Martin. / In situ and ex situ characterisation of the passive film on a ferritic stainless steel in molten sodium hydroxide. In: Applied Surface Science. 2005 ; Vol. 249, No. 1-4. pp. 162 - 175.
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abstract = "Voltammetric and electrochemical impedance spectroscopic measurements in combination with ex situ surface analysis are used to characterise the passive state of Fe–18{\%} Cr in molten NaOH at 470 °C. The areas of corrosion, passivity and transpassivity are derived from experimental voltammetric data and thermodynamic considerations. Impedance measurements in a wide potential range are performed to study the conductivity mechanism of the anodic layers formed. The surface composition of the passive film is estimated by X-ray photoelectron spectroscopy and its in-depth composition by Auger electron spectroscopy. A transfer function based on a tentative kinetic model is proposed to describe the impedance spectra. The parameters of the transfer function are determined by best-fit calculation and some of the kinetic and transport parameters characterising the film growth process are estimated.",
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In situ and ex situ characterisation of the passive film on a ferritic stainless steel in molten sodium hydroxide. / Kolchakov, Javor; Tzvetkoff, Tzvety; Bojinov, Martin (Corresponding Author).

In: Applied Surface Science, Vol. 249, No. 1-4, 2005, p. 162 - 175.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - In situ and ex situ characterisation of the passive film on a ferritic stainless steel in molten sodium hydroxide

AU - Kolchakov, Javor

AU - Tzvetkoff, Tzvety

AU - Bojinov, Martin

PY - 2005

Y1 - 2005

N2 - Voltammetric and electrochemical impedance spectroscopic measurements in combination with ex situ surface analysis are used to characterise the passive state of Fe–18% Cr in molten NaOH at 470 °C. The areas of corrosion, passivity and transpassivity are derived from experimental voltammetric data and thermodynamic considerations. Impedance measurements in a wide potential range are performed to study the conductivity mechanism of the anodic layers formed. The surface composition of the passive film is estimated by X-ray photoelectron spectroscopy and its in-depth composition by Auger electron spectroscopy. A transfer function based on a tentative kinetic model is proposed to describe the impedance spectra. The parameters of the transfer function are determined by best-fit calculation and some of the kinetic and transport parameters characterising the film growth process are estimated.

AB - Voltammetric and electrochemical impedance spectroscopic measurements in combination with ex situ surface analysis are used to characterise the passive state of Fe–18% Cr in molten NaOH at 470 °C. The areas of corrosion, passivity and transpassivity are derived from experimental voltammetric data and thermodynamic considerations. Impedance measurements in a wide potential range are performed to study the conductivity mechanism of the anodic layers formed. The surface composition of the passive film is estimated by X-ray photoelectron spectroscopy and its in-depth composition by Auger electron spectroscopy. A transfer function based on a tentative kinetic model is proposed to describe the impedance spectra. The parameters of the transfer function are determined by best-fit calculation and some of the kinetic and transport parameters characterising the film growth process are estimated.

KW - stainless steel

KW - molten hydroxide

KW - passive film

KW - electrochemical impedance spectroscopy

KW - surface analysis

KW - kinetic model

KW - surface treatment

KW - X-ray photoelectron spectroscopy

U2 - 10.1016/j.apsusc.2004.11.071

DO - 10.1016/j.apsusc.2004.11.071

M3 - Article

VL - 249

SP - 162

EP - 175

JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

IS - 1-4

ER -