Transpassive dissolution of Ni-Cr alloys in sulphate solutions-comparison between a model alloy and two industrial alloys

Martin Bojinov, Gunilla Fabricius, Petri Kinnunen (Corresponding Author), Timo Laitinen, Kari Mäkelä, Timo Saario, Göran Sundholm, Kirsi Yliniemi

Research output: Contribution to journalArticleScientificpeer-review

18 Citations (Scopus)

Abstract

The application of a general model for the transpassive dissolution mechanism of binary Ni-based alloys to industrial alloys, Alloy 600 and Alloy C276, containing Ni, Cr, Fe and Mo, in 1 M sulphate solutions at pH 0 and 5 is described. A comparison of the electrochemical behaviour of these two alloys to a binary Ni–15%Cr alloy is also included.
The techniques used were ring-disc voltammetry, impedance spectroscopy and resistance measurements. Soluble high-valency products were found to be released in a considerable amount from all the materials. The presence of Mo in Alloy C276 was found to increase the transpassive oxidation rate in comparison to alloys 600 and Ni–15%Cr at pH 0, but the same effect of Mo is not so well pronounced at pH 5.
The mechanism of transpassive dissolution was found to be similar on every material at pH 0. At pH 5 the mechanism of the transpassive dissolution on Alloy C276 at high overpotentials is different from that at low overpotentials or from that at pH 0.
This change is concluded to be due to the increased effect of adsorbed intermediates at the film/solution interface. The model was found to reproduce the steady state current and the impedance spectra satisfactorily.
Original languageEnglish
Pages (from-to)1697-1712
JournalElectrochimica Acta
Volume47
Issue number11
DOIs
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed

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Sulfates
Dissolution
Voltammetry
Spectroscopy
Oxidation

Keywords

  • ni-based alloys
  • oxide film
  • transpassive dissolution
  • kinetic model
  • electrochemical impedance spectroscopy

Cite this

Bojinov, Martin ; Fabricius, Gunilla ; Kinnunen, Petri ; Laitinen, Timo ; Mäkelä, Kari ; Saario, Timo ; Sundholm, Göran ; Yliniemi, Kirsi. / Transpassive dissolution of Ni-Cr alloys in sulphate solutions-comparison between a model alloy and two industrial alloys. In: Electrochimica Acta. 2002 ; Vol. 47, No. 11. pp. 1697-1712.
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abstract = "The application of a general model for the transpassive dissolution mechanism of binary Ni-based alloys to industrial alloys, Alloy 600 and Alloy C276, containing Ni, Cr, Fe and Mo, in 1 M sulphate solutions at pH 0 and 5 is described. A comparison of the electrochemical behaviour of these two alloys to a binary Ni–15{\%}Cr alloy is also included. The techniques used were ring-disc voltammetry, impedance spectroscopy and resistance measurements. Soluble high-valency products were found to be released in a considerable amount from all the materials. The presence of Mo in Alloy C276 was found to increase the transpassive oxidation rate in comparison to alloys 600 and Ni–15{\%}Cr at pH 0, but the same effect of Mo is not so well pronounced at pH 5. The mechanism of transpassive dissolution was found to be similar on every material at pH 0. At pH 5 the mechanism of the transpassive dissolution on Alloy C276 at high overpotentials is different from that at low overpotentials or from that at pH 0. This change is concluded to be due to the increased effect of adsorbed intermediates at the film/solution interface. The model was found to reproduce the steady state current and the impedance spectra satisfactorily.",
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Transpassive dissolution of Ni-Cr alloys in sulphate solutions-comparison between a model alloy and two industrial alloys. / Bojinov, Martin; Fabricius, Gunilla; Kinnunen, Petri (Corresponding Author); Laitinen, Timo; Mäkelä, Kari; Saario, Timo; Sundholm, Göran; Yliniemi, Kirsi.

In: Electrochimica Acta, Vol. 47, No. 11, 2002, p. 1697-1712.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Transpassive dissolution of Ni-Cr alloys in sulphate solutions-comparison between a model alloy and two industrial alloys

AU - Bojinov, Martin

AU - Fabricius, Gunilla

AU - Kinnunen, Petri

AU - Laitinen, Timo

AU - Mäkelä, Kari

AU - Saario, Timo

AU - Sundholm, Göran

AU - Yliniemi, Kirsi

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N2 - The application of a general model for the transpassive dissolution mechanism of binary Ni-based alloys to industrial alloys, Alloy 600 and Alloy C276, containing Ni, Cr, Fe and Mo, in 1 M sulphate solutions at pH 0 and 5 is described. A comparison of the electrochemical behaviour of these two alloys to a binary Ni–15%Cr alloy is also included. The techniques used were ring-disc voltammetry, impedance spectroscopy and resistance measurements. Soluble high-valency products were found to be released in a considerable amount from all the materials. The presence of Mo in Alloy C276 was found to increase the transpassive oxidation rate in comparison to alloys 600 and Ni–15%Cr at pH 0, but the same effect of Mo is not so well pronounced at pH 5. The mechanism of transpassive dissolution was found to be similar on every material at pH 0. At pH 5 the mechanism of the transpassive dissolution on Alloy C276 at high overpotentials is different from that at low overpotentials or from that at pH 0. This change is concluded to be due to the increased effect of adsorbed intermediates at the film/solution interface. The model was found to reproduce the steady state current and the impedance spectra satisfactorily.

AB - The application of a general model for the transpassive dissolution mechanism of binary Ni-based alloys to industrial alloys, Alloy 600 and Alloy C276, containing Ni, Cr, Fe and Mo, in 1 M sulphate solutions at pH 0 and 5 is described. A comparison of the electrochemical behaviour of these two alloys to a binary Ni–15%Cr alloy is also included. The techniques used were ring-disc voltammetry, impedance spectroscopy and resistance measurements. Soluble high-valency products were found to be released in a considerable amount from all the materials. The presence of Mo in Alloy C276 was found to increase the transpassive oxidation rate in comparison to alloys 600 and Ni–15%Cr at pH 0, but the same effect of Mo is not so well pronounced at pH 5. The mechanism of transpassive dissolution was found to be similar on every material at pH 0. At pH 5 the mechanism of the transpassive dissolution on Alloy C276 at high overpotentials is different from that at low overpotentials or from that at pH 0. This change is concluded to be due to the increased effect of adsorbed intermediates at the film/solution interface. The model was found to reproduce the steady state current and the impedance spectra satisfactorily.

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KW - transpassive dissolution

KW - kinetic model

KW - electrochemical impedance spectroscopy

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