Influence of lead ions on the macromorphology of electrodeposited zinc
- Univ. of California, Berkeley, CA (United States)
The morphology of zinc as it is electrodeposited from acid solutions demonstrates a remarkable imprint of electrolyte flow conditions. The development of macromorphology of zinc deposits has been investigated under galvanostatic conditions on a rotating plantinum disk electrode by use of photomacrography, scanning electron microscopy, electron probe microanalysis and Auger microprobe analysis. Logarithmic spiral markings, which reflect the hydrodynamic flow on a rotating disk, appear in a certain region of current density well below the limiting current density. Morphological observations revealed the major influence of trace lead ions on the amplifications of surface roughness through coalescence and preferred growth of initial protrusions. Results obtained from ultra-pure electrolyte suggest preferred crystal growth towards well-mixed orientation in the concentration field caused by slight differences in crystallization overpotential. A qualitative model involving a coupling mechanism between the evolving surface roughness and instability phenomena in the boundary layer is advanced to explain the formation of spiral patterns.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5827437
- Report Number(s):
- LBL-13057; ON: DE82002696
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ZINC
ELECTRODEPOSITION
MICROSTRUCTURE
CRYSTAL GROWTH
ROUGHNESS
SCANNING ELECTRON MICROSCOPY
CRYSTAL STRUCTURE
DEPOSITION
ELECTROLYSIS
ELECTRON MICROSCOPY
ELEMENTS
LYSIS
METALS
MICROSCOPY
SURFACE COATING
SURFACE PROPERTIES
360102* - Metals & Alloys- Structure & Phase Studies