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Electroless nickel-boron coatings on metal carbides

Di Giampaolo, A.R. ; Ordoñez, J.G. ; Gugliemacci, J.M. ; Lira, J.

Surface & coatings technology, 1997-02, Vol.89 (1), p.127-131 [Periódico revisado por pares]

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Título:
Electroless nickel-boron coatings on metal carbides
Autor: Di Giampaolo, A.R. ; Ordoñez, J.G. ; Gugliemacci, J.M. ; Lira, J.
Assuntos: Applied sciences ; Electroless nickel-boron coating ; Exact sciences and technology ; Metal carbides ; Metallic coatings ; Metals. Metallurgy ; Production techniques ; Surface treatment
É parte de: Surface & coatings technology, 1997-02, Vol.89 (1), p.127-131
Descrição: Electroless deposition is a very simple process which can be used to obtain amorphous metallic coatings of uniform thickness on metallic or non-metallic substrates. In this work, nickel-boron coatings were deposited by electroless plating on WC and VC powders and sintered substrates. Two electrolyte solutions for the deposition of Ni-B coatings were developed: an alkaline and an acidic bath, both based on nickel chloride. Coating characterization was carried out by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), Auger electron spectroscopy (AES) and X-ray diffraction (XRD). Both electrolytes produced continuous firms of uniform thickness on sintered carbide substrates; the acidic bath showed a higher deposition rate. Furthermore on the carbide powders it produced crack-free Ni-B continuous coatings. Ni was detected by EDS and the coating purity was confirmed by AES. XRD proved that amorphous coatings were obtained in all cases.
Editor: Lausanne: Elsevier B.V
Idioma: Inglês

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