Mechanical Properties and Corrosion Behaviour of Nanostructured Cu-rich CuNi Electrodeposited Films
Varea Espelt, Aïda (Universitat Autònoma de Barcelona. Departament de Física)
Suriñach, Santiago (Suriñach Cornet) (Universitat Autònoma de Barcelona. Departament de Física)
Pellicer Vilà, Eva Maria (Universitat Autònoma de Barcelona. Departament de Física)
Pané i Vidal, Salvador (Institute of Robotics and Intelligent Systems)
Nelson, Bradley J. (Institute of Robotics and Intelligent Systems)
Baró, M. D.. (Universitat Autònoma de Barcelona. Departament de Física)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)

Date:	2012
Abstract:	Nanocrystalline Cu-rich CuNi alloy thin films (with copper content ranging from 22 to 97 at%) have been grown by electrodeposition, using galvanostatic conditions in an electrolytic bath containing Ni and Cu sulphates with a [Ni(II)]/[Cu(II)] molar ratio of 11. The Cu content is tuned by varying the applied current density during deposition. The nanoscrystalline nature of Cu-rich CuNi thin films has been achieved using saccharine as a grain refinement agent, although for high Cu content (> 90 at%) the refinement effect is less pronounced. Due to the nanocrystalline character of the films, low surface roughness, good compactness, and outstanding mechanical properties (e. g. nanoindentation hardness values off approximately 7 GPa) are obtained, particularly for Cu percentages below 70 at%. The presence of stacking faults also contributes to the observed high strength. The films show good corrosion protective behaviour in a 3. 5 wt% NaCl medium, with corrosion potentials more positive than the bare substrate (pure-Cu) and lower corrosion current density values ranging from 1. 8 to 5. 4 [mi]A/square centimeters.
Grants:	Ministerio de Economía y Competitividad MAT2011-27380-C02-01 Agència de Gestió d'Ajuts Universitaris i de Recerca 2009/SGR-1292
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; Versió publicada
Subject:	Nanoestructures
Published in:	International journal of electrochemical science, Vol. 7, N. 2 (2012) , p. 1288-1302, ISSN 1452-3981

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Group of Smart Nanoengineered Materials, Nanomechanics and Nanomagnetism (Gnm3)
Articles > Published articles