Morphology and composition of Ni-Co electrodeposited powders

Journal Article · Thu Dec 15 04:00:00 EST 2011 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2011.09.001· OSTI ID:22066399

Lacnjevac, U C ^[1]; Stoiljkovic, M M ^[2]; Pavlovic, M G ^[3]; Jovic, V D ^[1]

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1. Institute for Multidisciplinary research, University of Belgrade, P.O. Box 33, 11030 Belgrade (Serbia)
2. Institute of Nuclear Sciences, 'Vinca', University of Belgrade, 11001 Belgrade, P. O. Box 522 (Serbia)
3. Institute of Electrochemistry, ICTM, University of Belgrade, 11000 Belgrade, Njegoseva 12 (Serbia)

The morphology, phase and chemical composition of Ni-Co alloy powders electrodeposited from an ammonium sulfate-boric acid containing electrolyte with different ratio of Ni/Co ions were investigated. The ratios of Ni/Co ions were 1/1, 1/2 and 1/3. The morphology, chemical composition and phase composition of the electrodeposited alloy powders were investigated using AES, SEM, EDS and XRD analysis. Composition of the electrolyte, i.e. the ratio of Ni/Co concentrations was found to influence both, the alloy phase composition and the morphology of Ni-Co alloy powders. At the highest ratio of Ni/Co = 1/1 concentrations typical 2D fern-like dendritic particles were obtained. With a decrease of Ni/Co ions ratio among 2D fern-like dendrites, 3D dendrites and different agglomerates were obtained. X-ray diffraction studies showed that the alloy powders mainly consisted of the face-centered cubic {alpha}-nickel phase and hexagonal close-packed {epsilon}-cobalt phase and minor proportions of face-centered cubic {alpha}-cobalt phase. The occurrence of the latter phase was observed only in the alloy powder with the higher cobalt concentration in electrolyte. The electrodeposition of Ni-Co powders occurred in an anomalous manner. - Highlights: Black-Right-Pointing-Pointer Ni-Co alloys powders were successfully electrodeposited. Black-Right-Pointing-Pointer Composition of the electrolyte (Ni/Co ions ratio) was found to influence on morphology of powders. Black-Right-Pointing-Pointer The electrodeposition of Ni-Co powders occurred in an anomalous manner.

• OSTI ID: 22066399
• Journal Information: Materials Characterization, Journal Name: Materials Characterization Journal Issue: 12 Vol. 62; ISSN 1044-5803; ISSN MACHEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMMONIUM SULFATES
AUGER ELECTRON SPECTROSCOPY
CHEMICAL COMPOSITION
COBALT
COBALT IONS
DENDRITES
ELECTRODEPOSITION
FCC LATTICES
HCP LATTICES
INTERMETALLIC COMPOUNDS
MORPHOLOGY
NICKEL
PARTICLES
POWDERS
SCANNING ELECTRON MICROSCOPY
X-RAY DIFFRACTION