Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/101379
Title: Determination of the Growth Time Period of Loose Zinc Deposit Using Interval Analysis Methods
Authors: Nikitin, V. S.
Ostanina, T. N.
Kumkov, S. I.
Rudoy, V. M.
Ostanin, N. I.
Issue Date: 2020
Publisher: Pleiades journals
Citation: Determination of the Growth Time Period of Loose Zinc Deposit Using Interval Analysis Methods / V. S. Nikitin, T. N. Ostanina, S. I. Kumkov, et al. — DOI 10.3103/S1067821220050119 // Russian Journal of Non-Ferrous Metals. — 2020. — Vol. 61. — Iss. 5. — P. 540-548.
Abstract: Abstract: A characteristic of obtaining metal powders by direct current electrolysis is changes in the morphology of particles over the loose deposit layer thickness up to the formation of large spherulites. Deposits should be periodically removed from the cathode in order to obtain a powder with homogeneous composition. This paper justifies the choice of the parameter describing the change in loose deposit properties and proposes a method for determining the periodicity of its removal from the cathode. Loose zinc deposits were obtained at 25°C from zincate electrolyte containing 0.3 mol L–1 of ZnO and 4 mol L–1 of NaOH at a current setpoint exceeding six times the limiting diffusion current calculated using the smooth electrode. Electrode potential, deposit thickness and evolved hydrogen volume were measured directly in the process of electrolysis. Current redistribution between the metal reduction and hydrogen evolution leads to a change in the structure of loose deposit particles. It is shown that the differential current efficiency of zinc is the parameter describing the change in the loose zinc deposit density. Its value should not exceed 0.96, in order to ensure deposition of loose deposit with homogeneous properties. A further increase in current efficiency will lead to the formation of aggregates at the deposit growth front. It is proposed to determine the periodicity of loose deposit removal from the cathode using the empirical equation for the time dependency of differential current efficiency of zinc. The mathematical and statistical analysis of the data obtained in six replicates was carried out. The interval approach made it possible to significantly narrow the range of permissible differential current efficiency values and, as a consequence, to determine empirical equation coefficients with acceptable accuracy and calculate the growth time period of a deposit with homogeneous structure. The obtained approach can be used to estimate the time period of loose metal deposition accompanied by hydrogen evolution. © 2020, Allerton Press, Inc.
Keywords: CURRENT EFFICIENCY
ELECTRODEPOSITION
ESTIMATION
GROWTH TIME PERIOD
INTERVAL ANALYSIS METHODS
PROCESS PARAMETERS
ZINC POWDERS
CATHODES
EFFICIENCY
ELECTROLYSIS
ELECTROLYTES
HYDROGEN
II-VI SEMICONDUCTORS
OXIDE MINERALS
POWDER METALS
SODIUM HYDROXIDE
ZINC DEPOSITS
ZINC OXIDE
CURRENT REDISTRIBUTION
DIFFERENTIAL CURRENT
ELECTRODE POTENTIALS
EMPIRICAL EQUATIONS
HOMOGENEOUS COMPOSITION
HOMOGENEOUS STRUCTURE
INTERVAL ANALYSIS METHOD
LIMITING DIFFUSION CURRENT
DEPOSITS
ELECTROLYTE
ESTIMATION METHOD
GROWTH RESPONSE
HEAVY METAL
HOMOGENEITY
NUMERICAL MODEL
SPHERULITE
ZINC
URI: http://hdl.handle.net/10995/101379
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85093070167
PURE ID: 14151400
36270566-afe6-4a78-ba2c-ab7f94adfc2e
ISSN: 10678212
DOI: 10.3103/S1067821220050119
metadata.dc.description.sponsorship: This study was supported by the Government of the Russian Federation, regulation no. 211, state assignment no. 0836-2020-003.
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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