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Autori: 9. G. Cârâc, C. Iticescu, Th. Lampke and S. Steinhäuser
Editorial: Revue Roumaine de Chimie, 52(11), p.1057-1062, 2007.
Electrocodeposition is a method successfully used to obtain composite coatings. The composite coatings in nickel matrix and nano-Al2O3 particles (20 nm) as dispersed phase were obtained from a Watts electrolytic bath at a current density of 3A/dm2. The concentration of nano-Al2O3 was 5, 10 and respectively 20g/L oxide in the bath. The effect of the embedded of Al2O3 nanoparticles in nickel matrix was studied. The surface morphology of layers was studied by light and scanning electron microscopy (SEM) and chemical composition by EDAX analysis. The Vickers microhardness on cross section of layers was investigated. The results show that the morphology (structure and roughness) and mechanical characteristics (e.g. microhardness) of the composite coatings differ from nickel deposits without nanoparticles.
Cuvinte cheie: electrocodeposition, composite coatings, nano-Al2O3, Ni matrix