2023-Sustainable Industrial Processing Summit
Intl. Symp on Electrochemistry, Molten Salts, Corrosion and Recycling
| Editors: | F. Kongoli, R. Fehrmann, V. Papangelakis, I. Paspaliaris, G. Saevarsdottir, G. Kipouros, R. Singh, F. Wang, D. Macdonald, R. Gupta, M. Barinova, F. Ahmed, H. Ozgunay, K. Tang, N.N. Thanh, C. Gaidau, K. Kolomaznik |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2023 |
| Pages: | 114 pages |
| ISBN: | 978-1-989820-98-8 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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ELECTROCHEMICAL BEHAVIOUR OF (NH4)2TiF6 AND NH4BF4 IN CARBAMIDE MELTS
Sergei Devyatkin1; Peixia Yang2; Fan Meng1;1HARBIN INSTITUTE OF TECHNOLOGY, Harbin, China; 2KHARBIN INSTITUTE OF TECHNOLOGY, Harbin, China;
Type of Paper: Regular
Id Paper: 348
Topic: 13
Abstract:
Carbamide melts have found applications as electrolytes for electrochemical treatment of metals [1, 2]. The possibility of electrochemical synthesis of refractory compounds from carbamide melts at 135°С has been examined for Ti-B as an example. In the binary system (NH2)2CO–(NH4)2TiF6 a new process, which is more electropositive than the decomposition of carbamide has been observed. The scan rate independence of potential characterizes the observed processes as reversible charge transfer. This process corresponds to the one-electron irreversible charge exchange: Ti(IV)/Ti(III). In the binary system (NH2)2CO–NH4BF4 only the decomposition of carbamide has been observed. In the ternary system (NH2)2CO–(NH4)2TiF6–NH4BF4 a new process, which is more electropositive than the decomposition of carbamide and more electronegative than the one-electron charge exchange: Ti(IV)/Ti(III) has been observed. This process corresponds to the electrochemical synthesis of Ti-B compound. Micron coatings of titanium boride have been obtained on nickel and stainless steel by the electrolysis from a (NH2)2CO–(NH4)2TiF6–NH4BF4 melt at 135°C at current densities of 10-20 mA/cm2
Keywords:
Electrodeposition; RefractoryReferences:
[1] Klochko M.A., Strelnikov A.A. 1960. Study of electrical conductivity and viscosity in the system ammonium nitrate – urea. In: Russian Journal of Inorganic Chemistry. Volume 10. p. 2483-2490.[2] Tumanova N.Kh., Devyatkin C.V. Boiko O.I. 2004. Refractory metals electrochemistry in ion and ion–organic melts. In: Ukrainian Chemical Journal. Volume 7/8. p. 78-84.