Influence of the electrolyte composition and temperature on the transpassive dissolution of austenitic stainless steels in simulated bleaching solutions

Iva Betova, Martin Bojinov, Petri Kinnunen, Pekka Pohjanne, Timo Saario

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)

Abstract

The transpassive corrosion of highly alloyed austenitic stainless steels UNS N08904, UNS S31254 and UNS S32654 was investigated at 20 and 70 °C in a range of simulated bleaching solutions with conventional and rotating ring-disc electrode voltammetry, as well as electrochemical impedance spectroscopy. The overall transpassive oxidation rate of UNS S32654 was found to be much higher than that of the other two alloys. The general features of the impedance spectra demonstrate that transpassive dissolution is favoured for UNS S32654 and secondary passivation predominates for the two other steels. The addition of oxalic acid resulted in a significant increase of the transpassive oxidation rate at both temperatures. At room temperature, the addition of diethylenetriaminopentaacetic acid (DTPA) led to a decrease of the transpassive oxidation rate, especially at pH 3. Conversely, the addition of DTPA to the pH 3 solution at 70 °C has been found to increase the transpassive oxidation rate. A kinetic model of the process is proposed, featuring a two-step transpassive dissolution of Cr via a Cr(VI) intermediate species and taking into account the dissolution of Fe(III) through the anodic film. The model has been found to be in quantitative agreement with the steady-state current versus potential curves and the impedance spectra. The kinetic parameters of transpassive dissolution have been determined and the relevance of their values is discussed.
Original languageEnglish
Pages (from-to)3335-3349
JournalElectrochimica Acta
Volume47
Issue number20
DOIs
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed

Fingerprint

Austenitic stainless steel
Bleaching
Electrolytes
Dissolution
Oxidation
Chemical analysis
Oxalic Acid
Temperature
Acids
Oxalic acid
Steel
Voltammetry
Electrochemical impedance spectroscopy
Kinetic parameters
Passivation
Corrosion
Electrodes
Kinetics

Keywords

  • stainless steel
  • transpassivity
  • simulated bleaching solution
  • electrochemical impedance spectroscopy
  • rotating ring-disc voltammetry
  • kinetic model

Cite this

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title = "Influence of the electrolyte composition and temperature on the transpassive dissolution of austenitic stainless steels in simulated bleaching solutions",
abstract = "The transpassive corrosion of highly alloyed austenitic stainless steels UNS N08904, UNS S31254 and UNS S32654 was investigated at 20 and 70 °C in a range of simulated bleaching solutions with conventional and rotating ring-disc electrode voltammetry, as well as electrochemical impedance spectroscopy. The overall transpassive oxidation rate of UNS S32654 was found to be much higher than that of the other two alloys. The general features of the impedance spectra demonstrate that transpassive dissolution is favoured for UNS S32654 and secondary passivation predominates for the two other steels. The addition of oxalic acid resulted in a significant increase of the transpassive oxidation rate at both temperatures. At room temperature, the addition of diethylenetriaminopentaacetic acid (DTPA) led to a decrease of the transpassive oxidation rate, especially at pH 3. Conversely, the addition of DTPA to the pH 3 solution at 70 °C has been found to increase the transpassive oxidation rate. A kinetic model of the process is proposed, featuring a two-step transpassive dissolution of Cr via a Cr(VI) intermediate species and taking into account the dissolution of Fe(III) through the anodic film. The model has been found to be in quantitative agreement with the steady-state current versus potential curves and the impedance spectra. The kinetic parameters of transpassive dissolution have been determined and the relevance of their values is discussed.",
keywords = "stainless steel, transpassivity, simulated bleaching solution, electrochemical impedance spectroscopy, rotating ring-disc voltammetry, kinetic model",
author = "Iva Betova and Martin Bojinov and Petri Kinnunen and Pekka Pohjanne and Timo Saario",
year = "2002",
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pages = "3335--3349",
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Influence of the electrolyte composition and temperature on the transpassive dissolution of austenitic stainless steels in simulated bleaching solutions. / Betova, Iva; Bojinov, Martin; Kinnunen, Petri; Pohjanne, Pekka; Saario, Timo.

In: Electrochimica Acta, Vol. 47, No. 20, 2002, p. 3335-3349.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Influence of the electrolyte composition and temperature on the transpassive dissolution of austenitic stainless steels in simulated bleaching solutions

AU - Betova, Iva

AU - Bojinov, Martin

AU - Kinnunen, Petri

AU - Pohjanne, Pekka

AU - Saario, Timo

PY - 2002

Y1 - 2002

N2 - The transpassive corrosion of highly alloyed austenitic stainless steels UNS N08904, UNS S31254 and UNS S32654 was investigated at 20 and 70 °C in a range of simulated bleaching solutions with conventional and rotating ring-disc electrode voltammetry, as well as electrochemical impedance spectroscopy. The overall transpassive oxidation rate of UNS S32654 was found to be much higher than that of the other two alloys. The general features of the impedance spectra demonstrate that transpassive dissolution is favoured for UNS S32654 and secondary passivation predominates for the two other steels. The addition of oxalic acid resulted in a significant increase of the transpassive oxidation rate at both temperatures. At room temperature, the addition of diethylenetriaminopentaacetic acid (DTPA) led to a decrease of the transpassive oxidation rate, especially at pH 3. Conversely, the addition of DTPA to the pH 3 solution at 70 °C has been found to increase the transpassive oxidation rate. A kinetic model of the process is proposed, featuring a two-step transpassive dissolution of Cr via a Cr(VI) intermediate species and taking into account the dissolution of Fe(III) through the anodic film. The model has been found to be in quantitative agreement with the steady-state current versus potential curves and the impedance spectra. The kinetic parameters of transpassive dissolution have been determined and the relevance of their values is discussed.

AB - The transpassive corrosion of highly alloyed austenitic stainless steels UNS N08904, UNS S31254 and UNS S32654 was investigated at 20 and 70 °C in a range of simulated bleaching solutions with conventional and rotating ring-disc electrode voltammetry, as well as electrochemical impedance spectroscopy. The overall transpassive oxidation rate of UNS S32654 was found to be much higher than that of the other two alloys. The general features of the impedance spectra demonstrate that transpassive dissolution is favoured for UNS S32654 and secondary passivation predominates for the two other steels. The addition of oxalic acid resulted in a significant increase of the transpassive oxidation rate at both temperatures. At room temperature, the addition of diethylenetriaminopentaacetic acid (DTPA) led to a decrease of the transpassive oxidation rate, especially at pH 3. Conversely, the addition of DTPA to the pH 3 solution at 70 °C has been found to increase the transpassive oxidation rate. A kinetic model of the process is proposed, featuring a two-step transpassive dissolution of Cr via a Cr(VI) intermediate species and taking into account the dissolution of Fe(III) through the anodic film. The model has been found to be in quantitative agreement with the steady-state current versus potential curves and the impedance spectra. The kinetic parameters of transpassive dissolution have been determined and the relevance of their values is discussed.

KW - stainless steel

KW - transpassivity

KW - simulated bleaching solution

KW - electrochemical impedance spectroscopy

KW - rotating ring-disc voltammetry

KW - kinetic model

U2 - 10.1016/S0013-4686(02)00271-2

DO - 10.1016/S0013-4686(02)00271-2

M3 - Article

VL - 47

SP - 3335

EP - 3349

JO - Electrochimica Acta

JF - Electrochimica Acta

SN - 0013-4686

IS - 20

ER -