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2017-07-06 - Colloque/Présentation - communication orale - Anglais - 3 page(s)

Bonin Luiza , Vitry Véronique , Delaunois Fabienne , "Properties of Electroless Nickel-Boron coatings stabilized by bismuth salts." in SMT31 - International Conference on Surface Modification Technologies, Mons, Belgique, 2017

  • Codes CREF : Métallurgie (DI2310)
  • Unités de recherche UMONS : Métallurgie (F601)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Ingénierie des matériaux (CRIM)
Texte intégral :

Abstract(s) :

(Anglais) The stabilization of electroless plating baths is generally obtained by the adsorption of primary stabilizers on the reactive surface and consecutive limitation of the number of active sites for the reaction. Electroless Nickel-Boron coatings stabilized by bismuth were prepared using a new environment friendly bath. The purpose of the present work is to produce Nickel-boron deposits reduced by borohydride, from a lead-free bath. These new coatings, when compared with the ‘classical’ bath (Ni-B-Pb), have modified chemical, mechanical and corrosion properties. The morphology of the new coatings does not present the cauliflower-like surface texture generally observed in the case of electroless nickel boron coatings. A change in the cross section morphology was also observed. The new coatings present a cross section with two dissimilar regions: the first region has a columnar structure, while the second one is denser. The NiB coatings stabilized by Bismuth salts have impressive hardness, 860 hv100. The new coatings have also really interesting scratch test resistance and wear behaviour.