Ultrasound-assisted electrodeposition of nickel: Effect of ultrasonic power on the characteristics of thin coatings

I. Tudela, Y. Zhang, M. Pal, I. Kerr, Timothy J. Mason, Andrew Cobley

    Research output: Contribution to journalArticle

    36 Citations (Scopus)

    Abstract

    The effect of ultrasonic power on the characteristics of low-frequency ultrasound-assisted electrodeposited Ni coatings from an additive-free Watts bath has been evaluated by different methods. XRD analysis showed that, while mechanical agitation favoured the electrocrystallization of Ni in the [211] direction, ultrasound promoted the electrodeposition of Ni with a [100] preferred orientation. FIB-SEM images of the surface of Ni deposits not only indicated that the surface structure agreed to some extent with the XRD results, but also that ultrasound refined, to a certain extent, some of the grains of the surface of the coatings. FIB-SEM images of the cross-section of the coatings confirmed this effect of ultrasound on the microstructure of the deposits. Such change in the microstructure of Ni, along with work-hardening by ultrasound, resulted in an increase in the hardness of the deposits. The characteristics of the deposits depended on the ultrasonic power employed, and it was found that Ni coatings electrodeposited using an ultrasonic power of 0.124 W/cm3 presented the higher proportion of crystals with a [100] preferred orientation, the highest degree of grain refinement in the surface and the highest microhardness values. Nevertheless, these deposits also presented visible erosion marks on the surface of the coatings due to the formation of transient bubble structures near the surface of the cathode during the electrodeposition. These erosion marks might be considered the main drawback to the use of ultrasound during the electrodeposition.
    Original languageEnglish
    Pages (from-to)49–59
    JournalSurface and Coatings Technology
    Volume264
    Early online date17 Jan 2015
    DOIs
    Publication statusPublished - 25 Feb 2015

    Fingerprint

    Nickel
    Electrodeposition
    electrodeposition
    ultrasonics
    Ultrasonics
    nickel
    coatings
    Coatings
    deposits
    Deposits
    erosion
    microstructure
    scanning electron microscopy
    agitation
    work hardening
    Erosion
    microhardness
    baths
    proportion
    Microstructure

    Bibliographical note

    The full text of this item is not currently available from the repository.

    Keywords

    • Nickel
    • Watts bath
    • Electroplating
    • Electrodeposition
    • Ultrasound

    Cite this

    Ultrasound-assisted electrodeposition of nickel: Effect of ultrasonic power on the characteristics of thin coatings. / Tudela, I.; Zhang, Y.; Pal, M.; Kerr, I.; Mason, Timothy J.; Cobley, Andrew.

    In: Surface and Coatings Technology, Vol. 264, 25.02.2015, p. 49–59.

    Research output: Contribution to journalArticle

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