Abstract
Control of the electrocrystallization process is essential in the deposition of metals from aqueous electrolytes. A knowledge of the influence of mass transfer on the metal ion reduction is a critical element in any number of electrolytic processes, particularly where relatively high current densities are desired. The use of more positive ion tracer techniques as a means of experimentally determining some of the mass transport properties of interest are described. Examples for copper, zinc and zinc alloys electrolysis are included.
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Abbreviations
- C b :
-
concentration in the bulk of the solution
- C s :
-
concentration at the surface of the electrode
- d :
-
hydraulic diameter of the cross section of the cell
- D :
-
diffusion coefficient
- e Me :
-
equivalent weight of Me
- F :
-
Faraday number
- g :
-
acceleration due to gravity
- Gr :
-
Grashof number
- H :
-
hydrodynamic entrance length
- (It):
-
quantity of electricity (current times time)
- J :
-
current density
- J dl :
-
diffusion limiting current density
- k=J dl/zFC :
-
mass transfer coefficient
- L :
-
electrode length
- P Me :
-
deposited mass of Me
- Re=vd/ν:
-
Reynolds number
- Sc=ν/D :
-
Schmidt number
- Sh :
-
Sherwood number
- v :
-
speed of electrolyte
- z :
-
number of electrons exchanged in the electrode reaction
- δ:
-
thickness of the diffusion layer
- η d :
-
diffusion overvoltage
- ν:
-
kinematic viscosity of electrolyte
- ϱ:
-
average density across diffusion layer
- ϱb :
-
bulk electrolyte density
- ϱ1 :
-
density of the electrolyte at the surface of the electrode
- ω:
-
rotation speed of the electrode
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Wang, H.M., Chen, S.F., O'Keefe, T.J. et al. Evaluation of mass transport in copper and zinc electrodeposition using tracer methods. J Appl Electrochem 19, 174–182 (1989). https://doi.org/10.1007/BF01062297
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DOI: https://doi.org/10.1007/BF01062297