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2014-12-09 - Livre/Chapitre ou partie - Anglais - 50 page(s)

Vitry Véronique , Delaunois Fabienne , "Nanostructured electroless nickel-boron coatings for wear resistance" in "Anti-Abrasive Nanocoatings: Current and future applications" , 978-0-85709-211-3

  • Edition : Woodhead Publishing
  • Codes CREF : Chimie des surfaces et des interfaces (DI1327), Physique appliquée des surfaces (DI2723), Tribologie (DI1269), Electrochimie hautes et basses températures (DI1326)
  • 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) Electroless nickel-boron coatings are good candidates for protection of metals against abrasive wear. They are synthesized by an electrochemical process based on the reduction of nickel salts by a chemical reagent, without the use of electrical energy, allowing perfect coverage and respect of dimension. The process can be applied to various metals and other substrates, provided the substrate is adequately prepared for plating. Their structure is linked to their boron content and their thermal history: as deposited coatings present very small grain sizes and can be considered as nearly amorphous while heat treated coatings present larger (but still nanometric) grain sizes and higher hardness. Electroless nickel-boron has a very typical surface texture, similar to a cauliflower. This is favourable to wear applications and is due to the growth mode of electroless nickel. One of the most important features of electroless nickel-boron coatings is their hardness, which is close to 700hv100 in the as deposited condition and can be increased by heat treatments up to 1200hv100. Abrasive wear of electroless nickel-boron coatings is good, as attested by the results of Taber wear tests. Moreover, those coatings present good behaviour in scratch testing.