Tailoring the physical properties of electrodeposited CoNiReP alloys with large Re content by direct, pulse, and reverse pulse current techniques

S. Pané, B. Özkale, K. M. Sivaraman, C. Ruiz-Camps, S. Suriñach, M. D. Baró, B. J. Nelson, J. Sort, E. Pellicer

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8 Citations (Scopus)

Abstract

The composition, surface morphology and structure of CoNiReP alloy films with large Re content (up to 27 at%), obtained in a citrate-glycine based electrolyte have been studied as a function of the electrodeposition technique. Direct current (DC), pulse plating (PP) and reverse pulse plating (RPP) were considered with cathodic current densities from -50 mA cm-2 to -250 mA cm-2. The mechanical and magnetic properties have been analyzed and the data obtained has been correlated with composition and crystallographic structure. For values of j (DC), jon (PP) and jc (RPP) below -100 mA cm-2, Co-rich, P-containing deposits are obtained. Beyond these current densities, both the quantities of Ni and Re increase simultaneously at the expense of Co and P, the latter virtually falling to zero. The highest Re percentage (25-27 at%) was achieved in both PP and RPP conditions at a cathodic pulse of -250 mA cm-2. All the films were either entirely nanocrystalline in nature or partially amorphous. Hardness values as high as 9.2 GPa have been found in PP plated Co64Ni 18Re18 deposits. Besides the large hardness, the incorporation of Re in the films leads to high elastic recovery values. The magnetic character of the deposits ranges from soft to semi-hard ferromagnetic. © 2013 Elsevier Ltd.
Original languageEnglish
Pages (from-to)43-50
JournalElectrochimica Acta
Volume96
DOIs
Publication statusPublished - 30 Apr 2013

Keywords

  • Magnetic properties
  • Mechanical properties
  • Pulse current deposition
  • Re-containing alloy
  • Reverse pulse current deposition

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