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
JournalApplied Surface Science
Volume249
Issue number1-4
DOIs
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed

Keywords

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

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