Codeposition of inorganic fullerene-like WS<inf>2</inf> nanoparticles in an electrodeposited nickel matrix under the influence of ultrasonic agitation

E. García-Lecina, I. García-Urrutia, J. A. Díez, J. Fornell, E. Pellicer, J. Sort

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Resum

The effects of ultrasound (US) agitation (at different intensities of ultrasound) on the codeposition of inorganic fullerene-like (IF) WS2 in a metallic Ni matrix are investigated. The wt.% of IF-WS2 particles in the nanocomposite coatings increases from 4.5 wt.% (in films grown under mechanical stirring but without US agitation) up to about 7 wt.% (in films prepared under US agitation at the optimum intensity of ultrasound). While composite coatings obtained only under mechanical stirring exhibit a rather irregular surface morphology, with pronounced 3D multinodular protrusions, a more uniform and compact coating is attained under application of US agitation. In turn, the introduction of WS2 particles significantly modifies the growth of Ni, inducing grain size refinement, increasing the stacking fault probability and causing a drastic change of crystallographic texture. These microstructural features act in a synergistic manner to simultaneously increase the hardness of the composite coatings while causing the expected decrease in the friction coefficient (due to the presence of WS2 solid lubricant particles), therefore enhancing the wear resistance, particularly when the coatings are deposited under the presence of US.©2013 Elsevier Ltd. All rights reserved.
Idioma originalEnglish
Pàgines (de-a)859-867
RevistaElectrochimica Acta
Volum114
DOIs
Estat de la publicacióPublicada - 30 de des. 2013

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