Analysis of Film Formation in High Chromium White Iron Hardfacing Alloys in alkaline Solution using EIS and SIMS

Varmaa Marimuthu, Goore Poorwa, V S Raja, Kannoorpatti Krishnan

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    A popular hardfacing alloy consisting of high chromium white iron (HCWI) was deposited on low carbon steel using shielded metal arc welding. The wear-resistant alloys are not only used in applications requiring wear resistance but also used in applications involving fluids of a range of pH values. It is well known that chromium containing alloys have good corrosion resistance due to the presence of passive film. In this study for understanding the film formation on carbides and eutectic austenite matrix, HCWI alloy were exposed to potentials (0.157 V vs. SCE and 0.758 V vs. SCE) derived from potentiodynamic studies in highly alkaline solution of pH 14, simulating Bayer refining process in alumina industry. Electrochemical impedance spectroscopy (EIS) technique was used to analyse the impedance of films. The thickness and the composition of film properties at various potentials were investigated by time-of-flight secondary ion mass spectrometry (ToF-SIMS). At potential 0.157 V versus SCE, chromium carbide had a thick layer of oxide film consisting of mainly FeO with minor amounts of CrO. The eutectic austenite matrix consisted of a much denser and slightly thinner film of FeO. It is proposed in this study that for the formation of an oxide film on carbides, the carbides would have to dissociate on the surface. This dissociation of carbides may likely render the hardfacing alloy less effective in wear-resistant applications. The results were explained through superimposing the Pourbaix diagram of chromium carbides and iron (Fe).
    Original languageEnglish
    Article number41
    Pages (from-to)1-8
    Number of pages8
    Journaljournal of bio- and tribo-corrosion
    Volume4
    Issue number3
    Early online date7 Jun 2018
    DOIs
    Publication statusPublished - Sep 2018

    Fingerprint

    Iron alloys
    Chromium
    Secondary ion mass spectrometry
    Electrochemical impedance spectroscopy
    Carbides
    Eutectics
    Oxide films
    Austenite
    Wear of materials
    Aluminum Oxide
    Iron
    Electric arc welding
    Low carbon steel
    Refining
    Wear resistance
    Corrosion resistance
    Metals
    Alumina
    Thin films
    Fluids

    Cite this

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    title = "Analysis of Film Formation in High Chromium White Iron Hardfacing Alloys in alkaline Solution using EIS and SIMS",
    abstract = "A popular hardfacing alloy consisting of high chromium white iron (HCWI) was deposited on low carbon steel using shielded metal arc welding. The wear-resistant alloys are not only used in applications requiring wear resistance but also used in applications involving fluids of a range of pH values. It is well known that chromium containing alloys have good corrosion resistance due to the presence of passive film. In this study for understanding the film formation on carbides and eutectic austenite matrix, HCWI alloy were exposed to potentials (0.157 V vs. SCE and 0.758 V vs. SCE) derived from potentiodynamic studies in highly alkaline solution of pH 14, simulating Bayer refining process in alumina industry. Electrochemical impedance spectroscopy (EIS) technique was used to analyse the impedance of films. The thickness and the composition of film properties at various potentials were investigated by time-of-flight secondary ion mass spectrometry (ToF-SIMS). At potential 0.157 V versus SCE, chromium carbide had a thick layer of oxide film consisting of mainly FeO with minor amounts of CrO. The eutectic austenite matrix consisted of a much denser and slightly thinner film of FeO. It is proposed in this study that for the formation of an oxide film on carbides, the carbides would have to dissociate on the surface. This dissociation of carbides may likely render the hardfacing alloy less effective in wear-resistant applications. The results were explained through superimposing the Pourbaix diagram of chromium carbides and iron (Fe).",
    keywords = "Hardfacing, High chromium white irons, Alkaline, Passivity, ToF-SIMS, EIS, Pourbaix diagram of carbides",
    author = "Varmaa Marimuthu and Goore Poorwa and {V S Raja} and Kannoorpatti Krishnan",
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    doi = "10.1007/s40735-018-0158-8",
    language = "English",
    volume = "4",
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    journal = "journal of bio- and tribo-corrosion",
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    Analysis of Film Formation in High Chromium White Iron Hardfacing Alloys in alkaline Solution using EIS and SIMS. / Marimuthu, Varmaa; Poorwa, Goore; V S Raja ; Krishnan, Kannoorpatti.

    In: journal of bio- and tribo-corrosion, Vol. 4, No. 3, 41, 09.2018, p. 1-8.

    Research output: Contribution to journalArticleResearchpeer-review

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    T1 - Analysis of Film Formation in High Chromium White Iron Hardfacing Alloys in alkaline Solution using EIS and SIMS

    AU - Marimuthu, Varmaa

    AU - Poorwa, Goore

    AU - V S Raja

    AU - Krishnan, Kannoorpatti

    PY - 2018/9

    Y1 - 2018/9

    N2 - A popular hardfacing alloy consisting of high chromium white iron (HCWI) was deposited on low carbon steel using shielded metal arc welding. The wear-resistant alloys are not only used in applications requiring wear resistance but also used in applications involving fluids of a range of pH values. It is well known that chromium containing alloys have good corrosion resistance due to the presence of passive film. In this study for understanding the film formation on carbides and eutectic austenite matrix, HCWI alloy were exposed to potentials (0.157 V vs. SCE and 0.758 V vs. SCE) derived from potentiodynamic studies in highly alkaline solution of pH 14, simulating Bayer refining process in alumina industry. Electrochemical impedance spectroscopy (EIS) technique was used to analyse the impedance of films. The thickness and the composition of film properties at various potentials were investigated by time-of-flight secondary ion mass spectrometry (ToF-SIMS). At potential 0.157 V versus SCE, chromium carbide had a thick layer of oxide film consisting of mainly FeO with minor amounts of CrO. The eutectic austenite matrix consisted of a much denser and slightly thinner film of FeO. It is proposed in this study that for the formation of an oxide film on carbides, the carbides would have to dissociate on the surface. This dissociation of carbides may likely render the hardfacing alloy less effective in wear-resistant applications. The results were explained through superimposing the Pourbaix diagram of chromium carbides and iron (Fe).

    AB - A popular hardfacing alloy consisting of high chromium white iron (HCWI) was deposited on low carbon steel using shielded metal arc welding. The wear-resistant alloys are not only used in applications requiring wear resistance but also used in applications involving fluids of a range of pH values. It is well known that chromium containing alloys have good corrosion resistance due to the presence of passive film. In this study for understanding the film formation on carbides and eutectic austenite matrix, HCWI alloy were exposed to potentials (0.157 V vs. SCE and 0.758 V vs. SCE) derived from potentiodynamic studies in highly alkaline solution of pH 14, simulating Bayer refining process in alumina industry. Electrochemical impedance spectroscopy (EIS) technique was used to analyse the impedance of films. The thickness and the composition of film properties at various potentials were investigated by time-of-flight secondary ion mass spectrometry (ToF-SIMS). At potential 0.157 V versus SCE, chromium carbide had a thick layer of oxide film consisting of mainly FeO with minor amounts of CrO. The eutectic austenite matrix consisted of a much denser and slightly thinner film of FeO. It is proposed in this study that for the formation of an oxide film on carbides, the carbides would have to dissociate on the surface. This dissociation of carbides may likely render the hardfacing alloy less effective in wear-resistant applications. The results were explained through superimposing the Pourbaix diagram of chromium carbides and iron (Fe).

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    KW - High chromium white irons

    KW - Alkaline

    KW - Passivity

    KW - ToF-SIMS

    KW - EIS

    KW - Pourbaix diagram of carbides

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    DO - 10.1007/s40735-018-0158-8

    M3 - Article

    VL - 4

    SP - 1

    EP - 8

    JO - journal of bio- and tribo-corrosion

    JF - journal of bio- and tribo-corrosion

    SN - 2198-4220

    IS - 3

    M1 - 41

    ER -