Transpassive dissolution mechanism of Ni-based alloys in a simulated bleaching solution: Effect of alloying elements

Iva Betova, Martin Bojinov, Petri Kinnunen, Timo Laitinen, Pekka Pohjanne, Timo Saario, Martti Vilpas

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

The transpassive dissolution of several nickel-based alloys has been studied in a simulated bleaching solution (0.014 M SO2−4, 0.017 M Cl−, and 0.0025 M diethylenetriaminopentaacetic acid, DTPA, pH 2.8) by electrochemical techniques.
The alloys have been prepared by welding superaustenitic stainless steels (UNS S31254 and S32654) with nickel-based filler metals (UNS N06625 and N06059). According to the rotating ring-disk voltammetric studies, the release of soluble high-valency products from the alloys plays a significant role in the transpassive potential region.
Electrochemical impedance spectroscopic data point to a competition between transpassive dissolution and secondary passivation reactions. The experimental data have been compared to a previously proposed model for the transpassive dissolution of nickel-based alloys.
The model treats the transpassive dissolution of Cr as a two-step reaction featuring a Cr(VI) intermediate. It assumes that the dissolution of Ni follows two parallel reaction paths, one of which involves a self-catalytic step.
The kinetic parameters of the process for the studied alloys have been determined, and a discussion of the role of alloying elements such as Fe and Mo on the transpassive dissolution mechanism is given
Original languageEnglish
Pages (from-to)B499-B509
JournalJournal of the Electrochemical Society
Volume149
Issue number11
DOIs
Publication statusPublished - 2002
MoE publication typeA1 Journal article-refereed

Fingerprint

Alloying elements
Bleaching
Dissolution
Nickel
Filler metals
Stainless Steel
Kinetic parameters
Passivation
Welding
Stainless steel
Acids

Keywords

  • alloy steel
  • dissolving
  • electrochemistry
  • austenitic stainless steel
  • electric impedance
  • passivation
  • catalysts
  • alloying additions
  • nickel alloys
  • nickel-based alloys

Cite this

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title = "Transpassive dissolution mechanism of Ni-based alloys in a simulated bleaching solution: Effect of alloying elements",
abstract = "The transpassive dissolution of several nickel-based alloys has been studied in a simulated bleaching solution (0.014 M SO2−4, 0.017 M Cl−, and 0.0025 M diethylenetriaminopentaacetic acid, DTPA, pH 2.8) by electrochemical techniques. The alloys have been prepared by welding superaustenitic stainless steels (UNS S31254 and S32654) with nickel-based filler metals (UNS N06625 and N06059). According to the rotating ring-disk voltammetric studies, the release of soluble high-valency products from the alloys plays a significant role in the transpassive potential region. Electrochemical impedance spectroscopic data point to a competition between transpassive dissolution and secondary passivation reactions. The experimental data have been compared to a previously proposed model for the transpassive dissolution of nickel-based alloys. The model treats the transpassive dissolution of Cr as a two-step reaction featuring a Cr(VI) intermediate. It assumes that the dissolution of Ni follows two parallel reaction paths, one of which involves a self-catalytic step. The kinetic parameters of the process for the studied alloys have been determined, and a discussion of the role of alloying elements such as Fe and Mo on the transpassive dissolution mechanism is given",
keywords = "alloy steel, dissolving, electrochemistry, austenitic stainless steel, electric impedance, passivation, catalysts, alloying additions, nickel alloys, nickel-based alloys",
author = "Iva Betova and Martin Bojinov and Petri Kinnunen and Timo Laitinen and Pekka Pohjanne and Timo Saario and Martti Vilpas",
year = "2002",
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Transpassive dissolution mechanism of Ni-based alloys in a simulated bleaching solution : Effect of alloying elements. / Betova, Iva; Bojinov, Martin; Kinnunen, Petri; Laitinen, Timo; Pohjanne, Pekka; Saario, Timo; Vilpas, Martti.

In: Journal of the Electrochemical Society, Vol. 149, No. 11, 2002, p. B499-B509.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Transpassive dissolution mechanism of Ni-based alloys in a simulated bleaching solution

T2 - Effect of alloying elements

AU - Betova, Iva

AU - Bojinov, Martin

AU - Kinnunen, Petri

AU - Laitinen, Timo

AU - Pohjanne, Pekka

AU - Saario, Timo

AU - Vilpas, Martti

PY - 2002

Y1 - 2002

N2 - The transpassive dissolution of several nickel-based alloys has been studied in a simulated bleaching solution (0.014 M SO2−4, 0.017 M Cl−, and 0.0025 M diethylenetriaminopentaacetic acid, DTPA, pH 2.8) by electrochemical techniques. The alloys have been prepared by welding superaustenitic stainless steels (UNS S31254 and S32654) with nickel-based filler metals (UNS N06625 and N06059). According to the rotating ring-disk voltammetric studies, the release of soluble high-valency products from the alloys plays a significant role in the transpassive potential region. Electrochemical impedance spectroscopic data point to a competition between transpassive dissolution and secondary passivation reactions. The experimental data have been compared to a previously proposed model for the transpassive dissolution of nickel-based alloys. The model treats the transpassive dissolution of Cr as a two-step reaction featuring a Cr(VI) intermediate. It assumes that the dissolution of Ni follows two parallel reaction paths, one of which involves a self-catalytic step. The kinetic parameters of the process for the studied alloys have been determined, and a discussion of the role of alloying elements such as Fe and Mo on the transpassive dissolution mechanism is given

AB - The transpassive dissolution of several nickel-based alloys has been studied in a simulated bleaching solution (0.014 M SO2−4, 0.017 M Cl−, and 0.0025 M diethylenetriaminopentaacetic acid, DTPA, pH 2.8) by electrochemical techniques. The alloys have been prepared by welding superaustenitic stainless steels (UNS S31254 and S32654) with nickel-based filler metals (UNS N06625 and N06059). According to the rotating ring-disk voltammetric studies, the release of soluble high-valency products from the alloys plays a significant role in the transpassive potential region. Electrochemical impedance spectroscopic data point to a competition between transpassive dissolution and secondary passivation reactions. The experimental data have been compared to a previously proposed model for the transpassive dissolution of nickel-based alloys. The model treats the transpassive dissolution of Cr as a two-step reaction featuring a Cr(VI) intermediate. It assumes that the dissolution of Ni follows two parallel reaction paths, one of which involves a self-catalytic step. The kinetic parameters of the process for the studied alloys have been determined, and a discussion of the role of alloying elements such as Fe and Mo on the transpassive dissolution mechanism is given

KW - alloy steel

KW - dissolving

KW - electrochemistry

KW - austenitic stainless steel

KW - electric impedance

KW - passivation

KW - catalysts

KW - alloying additions

KW - nickel alloys

KW - nickel-based alloys

U2 - 10.1149/1.1510135

DO - 10.1149/1.1510135

M3 - Article

VL - 149

SP - B499-B509

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

SN - 0013-4651

IS - 11

ER -