Determination of the Growth Time Period of Loose Zinc Deposit Using Interval Analysis Methods
| العنوان: | Determination of the Growth Time Period of Loose Zinc Deposit Using Interval Analysis Methods |
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| المؤلفون: | S. I. Kumkov, N. I. Ostanin, V. S. Nikitin, T. N. Ostanina, V. M. Rudoy |
| المصدر: | Russ. J. Non-ferrous Met. Russian Journal of Non-Ferrous Metals |
| بيانات النشر: | Allerton Press, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | CURRENT EFFICIENCY, Hydrogen, 02 engineering and technology, Electrolyte, LIMITING DIFFUSION CURRENT, 01 natural sciences, CURRENT REDISTRIBUTION, NUMERICAL MODEL, 020501 mining & metallurgy, law.invention, ZINC, law, Diffusion current, Composite material, ZINC POWDERS, 010302 applied physics, ELECTRODE POTENTIALS, ZINC DEPOSITS, INTERVAL ANALYSIS METHODS, Metals and Alloys, HYDROGEN, OXIDE MINERALS, HOMOGENEITY, Cathode, Surfaces, Coatings and Films, 0205 materials engineering, Mechanics of Materials, ELECTRODEPOSITION, ELECTROLYSIS, EMPIRICAL EQUATIONS, ELECTROLYTE, Electrode potential, EFFICIENCY, Materials science, POWDER METALS, ZINC OXIDE, chemistry.chemical_element, Zinc, DEPOSITS, GROWTH RESPONSE, SODIUM HYDROXIDE, 0103 physical sciences, CATHODES, HEAVY METAL, HOMOGENEOUS STRUCTURE, DIFFERENTIAL CURRENT, SPHERULITE, HOMOGENEOUS COMPOSITION, Electrolysis, ELECTROLYTES, INTERVAL ANALYSIS METHOD, Direct current, GROWTH TIME PERIOD, II-VI SEMICONDUCTORS, chemistry, ESTIMATION, ESTIMATION METHOD, PROCESS PARAMETERS |
| الوصف: | 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. This study was supported by the Government of the Russian Federation, regulation no. 211, state assignment no. 0836-2020-003. |
| وصف الملف: | application/pdf |
| تدمد: | 1934-970X 1067-8212 |
| DOI: | 10.3103/s1067821220050119 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d82aa5bf7759d1a46ca559935b49863b https://doi.org/10.3103/s1067821220050119 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....d82aa5bf7759d1a46ca559935b49863b |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 1934970X 10678212 |
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| DOI: | 10.3103/s1067821220050119 |