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",
    doi = "10.1149/1.1510135",
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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

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    ER -