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Journal of Solid State Electrochemistry

, Volume 10, Issue 12, pp 959–966 | Cite as

Morphology and composition of Ni–Co alloy powders electrodeposited from ammoniacal electrolyte

  • V. D. Jović
  • B. M. Jović
  • M. G. Pavlović
  • V. Maksimović
Original Paper

Abstract

In this paper, the morphology and phase structure of Ni–Co powders electrodeposited from ammoniacal electrolyte are investigated as a function of alloy powder composition. Composition of the electrolyte, i.e. the ratio of Ni2+/Co2+ concentration is found to influence both, the phase structure and the morphology of Ni–Co alloy powders. It is shown that the current density practically does not influence the morphology of Ni–Co alloy powders as well as alloy powder composition. At the highest ratio of the Ni2+/Co2+ ions typical spongy particles were obtained. With the decrease of the Ni2+/Co2+ ions ratio agglomerates of the size of about 100 μm, composed of a large number of fern-like dendrites on their surface were obtained. At the lowest Ni2+/Co2+ concentration ratio, among more dendritic particles, agglomerates typical for pure Co powder deposition were detected. It is also shown that depending on the Ni2+/Co2+ ratio different types of Ni and Co codeposition could be detected: anomalous and irregular. At the Ni2+/Co2+ ions ratio higher than 1 only β-Ni phase was detected, while at concentration ratios Ni2+/Co2+<1 h.c.p. α-Co phase together with β-Ni phase was detected in the alloy powder deposit.

Keywords

Ni-Co powders Fern-like dendrites Different agglomerates f.c.c. β-Ni phase h.c.p. α-Co phase 

Notes

Acknowledgement

This work was supported by the Ministry of Science and Environmental Protection of the Republic of Serbia under the research project “Electrodeposition of Metal Powders at a Constant and Periodically Changing Rate” (1806/2002).

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • V. D. Jović
    • 1
  • B. M. Jović
    • 1
  • M. G. Pavlović
    • 2
  • V. Maksimović
    • 3
  1. 1.Center for Multidisciplinary Studies University of BelgradeBelgradeSerbia and Montenegro
  2. 2.ICTMInstitute of ElectrochemistryBelgradeSerbia and Montenegro
  3. 3.Institute of Nuclear Science, BelgradeSerbia and Montenegro

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