Effect of plating parameters on microstructure and tribological properties of Co–BN(hexagonal) nano composite coatings

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Abstract

Effects of current density, duty cycle and frequency on microstructure and particles content of electrodeposited Co–BN (hexagonal) nano composite coatings were analyzed by SEM, FESEM, EDS, AFM and XRD techniques. The microhardness, tribological behavior and wear mechanism were also investigated. Generally, as the current density and frequency increased, the particles content and microhardness of the coatings increased firstly and then decreased. Moreover, by reducing duty cycle, more particles were incorporated and higher microhardness was obtained. The best tribological behavior was achieved under the conditions: duty cycle of 10%, frequency of 50 Hz and current density of 100 mA/cm2.

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Cited by (11)

  • Effects of ultrasonic agitation prior to deposition and additives in the bath on electrodeposited Ni-B/hBN composite coatings

    2018, Journal of Alloys and Compounds
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    In addition, the studies have been made about composite coatings which obtained by codeposition of hBN second phase particles with some alloy or metal matrix. For example; Ni-W/hBN [14], Ni-Fe/hBN [5], Co-hBN [15–17], Ni-hBN [18,19], Ni-hBN-B4C [20,21], Ni-SiC-hBN [22,23]. In this study, Ni-B alloy coatings reinforced with hexagonal boron nitride ceramics were prepared by electrodeposition and the effects of the additives in the bath and the effect of ultrasonic mixing before deposition to the properties of the Ni-B/hBN composite coatings were investigated for the first time in the literature.

  • Production and characterization of electrodeposited Ni-B/hBN composite coatings

    2018, Surface and Coatings Technology
    Citation Excerpt :

    hBN is an inorganic material and its key properties are non-toxic, chemically inert, low thermal expansion, low dielectric constant, easily processable, high electrical resistance, non-abrasive, good thermal shock resistance, lubricity, high thermal conductivity, high corrosion resistance [15]. In the literature Ni-W/hBN [16], Ni-Fe/hBN [17], Co-hBN [18–20], Ni-hBN [21,22], Ni-hBN-B4C [23,24], Ni-SiC-hBN [25,26] can be given as examples to some of the electrodeposited coating studies in which hBN is used as a reinforcement phase. In this study, reinforced Ni-B alloy coatings with hBN ceramic were prepared by use of electrodeposition method and properties of Ni-B/hBN composite coatings were investigated.

  • Morphology and Rietveld analysis of nanostructured Co-Ni electrodeposited thin films obtained at different current densities

    2017, Surface and Coatings Technology
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    This deposition technique, based on a simple and lower cost process involves several chemical reactions in the electrolyte leading to very complex phenomena. A large variety of parameters, including the process conditions (substrate, deposition potential, current density, deposition time, deposition temperature) and the bath conditions (bath composition, electrolyte pH) can be used to control and optimize the structure and properties of deposited films [6,10–13]. Co–Ni alloys have been performed by electrodeposition from a diversity of baths (chloride, sulfate, mixed sulfate-chloride, etc.) [5,14].

  • Tribological and electrochemical corrosion behavior of Ni–W/BN (hexagonal) nano-composite coatings

    2015, Ceramics International
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    Electrodeposition formed by electroplating depends on a lot of parameters such as current density, temperature, pH, time of deposition, etc. [7,8]. To attain better deposits with high caliber, it is essential to control the plating parameters [9]. An agglomeration of particles is an undesirable problem during electrodeposition of a nanocomposite coating, which would decline the properties of the deposition.

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