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2016-08-18 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Vitry Véronique , Bonin Luiza, "Formation and characterization of multilayers borohydride and hypophosphite reduced electroless nickel deposits" in 11th International Symposium on Electrochemical Micro & Nanosystem Technologies, Bruxelles, Belgique, 2016

  • Codes CREF : Chimie des surfaces et des interfaces (DI1327), Matériaux composites (DI2726), Résistance et comportement des matériaux (DI2110), Electrochimie hautes et basses températures (DI1326), Corrosion des matériaux (DI2114)
  • Unités de recherche UMONS : Métallurgie (F601)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Ingénierie des matériaux (CRIM)

Abstract(s) :

(Anglais) The present work aims to study the formation of multilayers electroless Ni-B and Ni-P deposits and evaluation of their characteristic properties. The Ni–P/Ni–B multilayer coatings were prepared using dual baths. A commercial acid bath having hypophosphite as the reducing agent was used to prepare the electroless Ni-P coatings. A second alkaline bath, having nickel chloride as the source of nickel and borohydride as the reducing agent was used to prepare the electroless Ni-B deposits. Different samples are made with Ni–P and Ni–B as inner layers and Ni-B and Ni-P single layers coatings were also prepared to better compare the properties. Ni-B/Ni-P multilayers coatings were prepared on mild steel substrate. The multilayer coatings are composed of ten layers, the layers deposition alternating between Ni-P and Ni-B electroless bath. The total deposition time was one hour (10 x 6min). Scanning electron microscopy (SEM) was used to assess the multiples interfaces and measuring the thickness. The surface microhardness and roughness were compared with the single layer depositions. Scratch test was used to qualify the adherence between the layers. XRD patterns reveal that Ni-B/Ni-P deposits of the present study are X-ray amorphous in as-plated condition.