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    Effect of surfactant concentration in the electrolyte on the tribological properties of nickel-tungsten carbide composite coatings produced by pulse electro co-deposition
    (Elsevier Science Bv, 2015) Kartal, Muhammet; Uysal, Mehmet; Gül, Harun; Alp, Ahmet; Akbulut, Hatem
    A nickel plating bath containing WC particles was used to obtain hard and wear-resistant particle reinforced Ni/WC MMCs on steel surfaces for anti-wear applications. Copper substrates were used for electro co-deposition of Ni matrix/WC with the particle size of <1 mu m tungsten carbide reinforcements. The influence of surfactant (sodium dodecyl sulfate, SDS) concentration on particle distribution, microhardness and wear resistance of composite coatings has been studied. The nickel films were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The effects of the surfactant on the zeta potential, co-deposition and distribution of WC particles in the nickel matrix, as well as the tribological properties of composite coatings were also investigated. The tribological behaviors of the electrodeposited WC composite coatings sliding against M50 steel ball (empty set 10 mm) were examined on a CSM Instrument. All friction and wear tests were performed without lubrication at room temperature and in the ambient air (relative humidity 55-65%). (C) 2015 Elsevier B.V. All rights reserved.
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    Ni/MWCNT Coatings Produced by Pulse Electrocodeposition Technique
    (Taylor & Francis Inc, 2015) Kartal, Muhammet; Gül, Harun; Uysal, Mehmet; Alp, A.; Akbulut, Hatem
    Nickel/multiwalled carbon nanotube (MWCNT) metal matrix composite coatings were deposited by pulse electrocodeposition method from a Watt's-type electrolyte. The influence of the MWCNT content in the electrolyte on the particle codeposition and distribution, the surface morphology, microstructure, microhardness of nanocomposite coatings were studied. Copper substrates were used for electrocodeposition of Ni matrix/MWCNTs with the diameter of 50-60 nm and length of 10-mu m carbon nanotube reinforcements. The electrodeposited Ni matrix coatings were characterized by scanning electron microscopy and X-ray diffraction analysis.
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    Preparation and Characterization of Copper Powders with Sn Coating by the Electroless Plating
    (Polish Acad Sciences Inst Physics, 2015) Uysal, Mehmet; Çetinkaya, Tuğrul; Gül, Harun; Kartal, Muhammet; Algül, Hasan; Tokur, Mahmud; Akbulut, Hatem
    In this work, Sn-Cu composite powders were produced using an electroless process. The tin content on the surface of copper powders was vaned by using different concentrations of SnSO4 in the plating bath. The surface morphology of the produced Sn-Cu composite powders was characterized using scanning electron microscopy (SEM). Energy dispersive spectroscopy (EDS) was used to determine the elemental surface composition of the composites. X-ray diffraction (XRD) analysis was performed to investigate the structure of the Sn-Cu composite powders. The electrochemical performance of Sn-Cu nanocomposites was studied by charge/discharge tests.
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    Pulse electrocodeposition of Ni/MWCNT nanocomposite coatings
    (Taylor & Francis Ltd, 2015) Kartal, Muhammet; Uysal, Mehmet; Gül, Harun; Alp, Ahmet; Akbulut, Hatem
    Nickel/multiwalled carbon nanotube (MWCNT) metal matrix composite coatings were deposited by pulse electrocodeposition method from a Watt's type electrolyte. The influence of peak current density on the particle codeposition and distribution, the surface morphology, microstructure, microhardness and wear resistance of nanocomposite coatings were studied. Copper substrates were used for electrocodeposition and MWCNTs with the diameter of 50-60 nm and length of 10 mm used as reinforcements. The electrodeposited Ni matrix coatings were characterised by scanning electron microscopy, Raman spectroscopy and X-ray diffraction analysis.