Structure, morphology and mechanical properties of electrodeposited composite coatings Ni–P/SiC

Joël Alexis (1) , Bernard Etcheverry (1) , Jean-Denis Béguin (1) , Jean-Pierre Bonino (2)

1 LGP - Laboratoire Génie de Production
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Physical properties of the NiP/SiC deposits are discussed according to the electroplating parameters and heat treatments. The insertion of silicon carbide in the coatings does not modify their rigidity (E = 230 GPa), increases their hardness slightly (50 Vickers) and decreases the residual stresses in the coatings. The phosphorus content has a major effect on the structure and the physical properties. Indeed, the insertion of phosphorus into the deposits generates a grain size reduction or even an amorphisation which results in morphological modifications observed by AFM. In parallel a very important hardening is associated with incorporation of phosphorus: hardness is multiplied by 3 to reach 600 HV0.1. The deposits tend to become crystalline following the heat treatments. With 420 °C, the precipitation of a Ni3P phase which distorts the crystal lattice is observed, increasing the hardness of the deposits.

Mots clés: Nickel-phosphorus; Coating; Mechanical properties

Domaines: Matériaux

Joël Alexis, Bernard Etcheverry, Jean-Denis Béguin, Jean-Pierre Bonino. Structure, morphology and mechanical properties of electrodeposited composite coatings Ni–P/SiC. Materials Chemistry and Physics, 2010, vol. 120, pp. 244-250. ⟨10.1016/j.matchemphys.2009.12.013⟩. ⟨hal-00760126⟩