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Electrodeposition of Ni, Co and Ni–Co alloy powders

Authorized Users Only
2006
Authors
Jović, Vladimir
Jović, Borka
Pavlović, Miomir
Article (Published version)
,
Elsevier
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Abstract
In this paper the polarization characteristics of the processes of Ni and Co powders and Ni-Co alloy powders electrodeposition from ammonium sulfate containing supporting electrolyte are investigated as a function of Ni 2+ and Co 2+ ions concentrations. It is shown that the correct polarization curves for Ni and Co powders and Ni-Co alloy powders electrodeposition could be obtained only after IR drop correction, since the total current density of electrodeposition at the most negative potential of -1.4 V versus Ag|AgCl is extremely high (up to about 3-6 A cm -2 ) as a consequence of simultaneous hydrogen evolution which starts immediately after the beginning of metals (alloys) deposition. After determining the current density for hydrogen evolution and its subtraction from the total current density, correct polarization curves for Ni and Co powders and Ni-Co alloy powders electrodeposition are obtained. They are found to be different for each ratio of Ni 2+ /Co 2+ ions concentration. I...t is also concluded that the shape of the polarization curves in all cases is practically defined by the shape of the polarization curve for hydrogen evolution. The morphology and composition of electrodeposited powders were also found to be sensitive to the ratio of Ni 2+ /Co 2+ ions concentration.

Keywords:
Ni / Co / Ni–Co alloy powders / Electrodeposition / Polarization curves / Hydrogen evolution / Morphology / Alloy powder composition
Source:
Electrochimica Acta, 2006, 51, 25, 5468-5477
Publisher:
  • Elsevier
Projects:
  • Deposition of ultrafinepowders of metals and alloys and nanostructured surfaces by electrochemical techniques (RS-142032)

DOI: 10.1016/j.electacta.2006.02.022

ISSN: 0013-4686; 1873-3859

WoS: 000240026500030

Scopus: 2-s2.0-33746211267
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URI
https://cer.ihtm.bg.ac.rs/handle/123456789/4115
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