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http://elar.urfu.ru/handle/10995/101379
Название: | Determination of the Growth Time Period of Loose Zinc Deposit Using Interval Analysis Methods |
Авторы: | Nikitin, V. S. Ostanina, T. N. Kumkov, S. I. Rudoy, V. M. Ostanin, N. I. |
Дата публикации: | 2020 |
Издатель: | Pleiades journals |
Библиографическое описание: | 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. |
Аннотация: | 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. |
Ключевые слова: | 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://elar.urfu.ru/handle/10995/101379 |
Условия доступа: | info:eu-repo/semantics/openAccess |
Идентификатор РИНЦ: | 45247993 |
Идентификатор SCOPUS: | 85093070167 |
Идентификатор WOS: | 000580524500009 |
Идентификатор PURE: | 36270566-afe6-4a78-ba2c-ab7f94adfc2e 14151400 |
ISSN: | 10678212 |
DOI: | 10.3103/S1067821220050119 |
Сведения о поддержке: | This study was supported by the Government of the Russian Federation, regulation no. 211, state assignment no. 0836-2020-003. |
Располагается в коллекциях: | Научные публикации ученых УрФУ, проиндексированные в SCOPUS и WoS CC |
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2-s2.0-85093070167.pdf | 708,34 kB | Adobe PDF | Просмотреть/Открыть |
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