2025 - Sustainable Industrial Processing Summit
SIPS2025 Volume 11. Intl. Symp on Iron and Steel, Non-ferrous, Metals, Bioextraction, Molten and Recycling
| Editors: | F. Kongoli, P. Assis, R. Alvarenga, J.A. de Castro, B. Deo, W.F. Santos Jr., S.L. de Andrade, GS. Mahobia, T. Usui, J. Antrekowitsch, A. Charitos, C. Oosterhof, M. Stelter, Z. Wang, A. Dmitriev, M.C. Gomez Marroquin, Y. Gordon, M. Naimanbayev, S. Prakash, V. Tsepelev |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2025 |
| Pages: | 298 pages |
| ISBN: | 978-1-998384-58-7 (CD) |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
CD shopping page
ELECTROCHEMICAL SYNTHESIS OF Ti-B COMPOUND FROM IMIDAZOLE MELTS
Sergei Devyatkin1; Peixia Yang1; Fan Meng1;1HARBIN INSTITUTE OF TECHNOLOGY, Harbin, China;
Type of Paper: Regular
Id Paper: 112
Topic: 13
Abstract:
In this work, we have studied the possibility of the electrochemical synthesis of titanium borides from ionic-organic melt based on imidazole: C3H4N2 (tm = 91°C) [1]. The solubility of (NH4)2TiF6 and NH4BF4 in imidazole melts at 120°С reaches 5 and 10 wt.%, which makes it possible to carry out voltammetric studies and electrolysis experiments. In the binary system: C3H4N2 (tm = 91°C)–(NH4)2TiF6 a new process, which is more electropositive than the decomposition of imidazole as 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 C3H4N2 –NH4BF4 only the decomposition of imidazole has been observed. In the ternary system C3H4N2–(NH4)2TiF6–NH4BF4 a new process, which is more electropositive than the decomposition of imidazole and more electronegative than the one-electron charge exchange: Ti(IV)/Ti(III) has been observed. 10 micron coatings have been obtained on nickel and stainless steel by the electrolysis from a C3H4N2–(NH4)2TiF6–NH4BF4 melt at 120°C at current densities of 20-40 mA/cm2. The X-ray phase analysis of samples after the electrolysis ofan ionic-organic melt did not allow us to determine the composition of the coating because it was very fine-crystalline. In order to coarsen the crystal structure of the coating, the samples were annealed in a furnace at 600°C in Ar stream. The research has established that the XRD patterns of the products obtained by electrolysis C3H4N2–(NH4)2TiF6–NH4BF4 to nickel cathode at 120°C and after annealing at 600°С in an Ar stream exhibits peaks corresponds to the Ni (COD - 96-901-3025) and TiB (COD - 96-151-1333) [2]. TiB crystallizes in the orthorhombic Pnma space group. The sample was obtained without extraneous phases inclusions. On the basis of XRD analyses it may be assumed that the stoichiometry of the compound deposited from ionic-organic melts is TiB.