Development of the electrochemical synthesis method of ultrafine cobalt powder for a superalloy production

Authors

  • Vadym Kovalenko Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0002-8012-6732
  • Valerii Kotok Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0001-8879-7189
  • Sergey Vlasov National Mining University Yavornytskoho ave., 19, Dnipro, Ukraine, 49005 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000, Ukraine https://orcid.org/0000-0002-5537-6342

DOI:

https://doi.org/10.15587/1729-4061.2018.126928

Keywords:

cobalt ( 3) ammine complex, cobalt powder, superalloys, dendrite

Abstract

The electrochemical synthesis method for the preparation of ultrafine cobalt powder from the sulfate-ammonium electrolyte for the preparation of superalloys, has been developed. It was proposed to introduce ammonia to the electrolyte until рН=11. The electrolyte composition and the mechanism behind electrochemical processes during cobalt powder synthesis have been studied. The formation of the Co2+ammine complex has been observed. The precipitate dissolved in the mother liquor during a week, with the formation of a purple-red solution. By recording cathodic and cyclic cathodic-anodic curves, it was discovered that the solution with dissolved precipitate contained Со3+. It was revealed that the synthesis process occurs in two stages «Со3+–Со2+–Со0», which results in the increased polarization and formation of ultrafine cobalt powder. The influence of electrolyte temperature on electrolysis and powder characteristics has been studied. It was revealed that higher temperatures lead to larger particle size and formation of compact metal particles. It has been determined that the maximum electrolyte temperature should not exceed 30 °С. It is shown that under these conditions, the Co powder is composed of spherical particles that form coral-like aggregates with the size of 35–150 µm, which can be easily ground. The cobalt powder forms with the cathodic current yield of 39 % and specific power consumption of 48 kW·h/kg, which indicates a high effectiveness of the developed method.

Author Biographies

Vadym Kovalenko, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000

PhD, Associate Professor

Department of Analytical Chemistry and Food Additives and Cosmetics

Department of Technologies of Inorganic Substances and Electrochemical Manufacturing

Valerii Kotok, Ukrainian State University of Chemical Technology Gagarina ave., 8, Dnipro, Ukraine, 49005 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000

PhD, Associate Professor

Department of Processes, Apparatus and General Chemical Technology

Department of Technologies of Inorganic Substances and Electrochemical Manufacturing

Sergey Vlasov, National Mining University Yavornytskoho ave., 19, Dnipro, Ukraine, 49005 Vyatka State University Moskovskaya str., 36, Kirov, Russian Federation, 610000

Doctor of Technical Sciences, Professor

Department of underground mining

Department of building manufacture

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Published

2018-03-26

How to Cite

Kovalenko, V., Kotok, V., & Vlasov, S. (2018). Development of the electrochemical synthesis method of ultrafine cobalt powder for a superalloy production. Eastern-European Journal of Enterprise Technologies, 2(6 (92), 41–47. https://doi.org/10.15587/1729-4061.2018.126928

Issue

Vol. 2 No. 6 (92) (2018): Technology organic and inorganic substances

Section

Technology organic and inorganic substances

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Copyright (c) 2018 Vadym Kovalenko, Valerii Kotok, Sergey Vlasov

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