Journal of Solid State Electrochemistry

, Volume 10, Issue 7, pp 423–429 | Cite as

The study of Ni–Co alloy deposition on iron powder particles in a fluidized bed from sulphate bath

  • R. Rozik
  • R. Oriňàková
  • K. Markušová
  • L. Trnková
Original Paper
First Online:
Received:
Revised:
Accepted:

Abstract

This paper describes a process of electrolytic deposition of nickel–cobalt (Ni–Co) binary alloy on Fe powder. Electrochemical behavior of this binary alloy was studied by cyclic voltammetry with a paraffin impregnated graphite electrode as a working electrode. Deposition of individual metals (Ni, Co), as well as the simultaneous nickel–cobalt co-deposition, was performed in aqueous solutions (Watts-type electrolyte) both with and without Fe powder. Special attention was paid to the influence of suspension density on the electrode process. This density affects on the quality of iron powder electroplating. Preferential deposition of the less noble metal (Co) leading to its higher content in the deposit was observed in contrast to the more noble one (Ni) in spite of higher content of Ni in the plating solution. This anomalous phenomenon–known already for other metals (Zn, Cd, Sn)–has been confirmed and investigated for iron-group metals (Fe, Co, Ni) in this work. Electrolytic deposition of Ni–Co binary alloys, including anomalous behavior is a complicated process. Understanding the anomalous behavior would lead to better control of the deposition process and to explanation of the mechanism of Ni–Co co-deposition.

Keywords

Nickel Cobalt Fe powder Paraffin impregnated graphite electrode (PIGE) Anomalous co-deposition Cyclic voltammetry Polarization curves 

Abbreviations

ε

Voidage factor

Vpowder

Volume of iron powder

Velectrolyte

Volume of the electrolyte

α

Charge transfer coefficient

CV

Cyclic voltammetry

PIGE

Paraffin impregnated graphite electrode

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Notes

Acknowledgements

This work was supported by the research project INCHEMBIOL (MSM 0021622412), the projects AIP no. 46 and no. 750/2005 from the Ministry of Education, Youth and Sports and GA SR, VEGA (Grant number 1/2118/05).

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • R. Rozik
    • 1
  • R. Oriňàková
    • 2
  • K. Markušová
    • 2
  • L. Trnková
    • 1
  1. 1.Department of Theoretical and Physical Chemistry, Faculty of ScienceMasaryk UniversityBrnoCzech Republic
  2. 2.Institute of Chemistry, Faculty of ScienceP.J. Šafárik UniversityKošiceSlovak Republic

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