2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 9: Molten Salts and Ionic Liquids, Energy Production
| Editors: | Kongoli F, Gaune-Escard M, Turna T, Mauntz M, Dodds H.L. |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2016 |
| Pages: | 390 pages |
| ISBN: | 978-1-987820-24-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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The possibility of electrodeposition of the titanium diboride coherent coating on graphite or other solid surface from cryolite -alumina melts containing titanium and boron oxides
Sergei Devyatkin1;1INSTITUTE OF GENERAL AND INORGANIC CHEMISTRY, Kiev, Ukraine;
Type of Paper: Regular
Id Paper: 209
Topic: 13
Abstract:
One of the perspective ways to develop the traditional Hall-Heroult technology is to introduce new, inert electrode materials. Titanium diboride has been considered to be the most perspective cathode material for the last decades, due to its following properties:
i. good electric conductivity,
ii. perfect wettability by aluminum under cryolite,
iii. protection sodium expansion to graphite,
iv. high corrosion resistance toward liquid aluminum and cryolite melt, etc.
The objective of this work was to study and to develop a method for electrochemical synthesis of titanium diboride protective coherent coating from cryolite-alumina melts contain boron and titanium oxides.
The chemical and electrochemical behavior of titanium and boron oxides in cryolite -alumina melts were studied by cyclic voltammetry in air and argon atmosphere at 1273 K. Titanium diboride coherent coatings were deposited by electrochemical synthesis from the molten salts system Na3AlF6-Al4B2O9-CaTiO3 onto graphite.
Keywords:
Electrochemical; Electrodeposition; Electrolysis; Moltensalt; Refractory;References:
[1] K.Grjotheim, B.J. Welch:, Aluminium smelter technology, 1980, Aluminium-Verlag Dusseldorf.[2] K. Billehaug, H.A. Øye: Inert Cathodes and Anodes for Aluminium Electrolysis, Aluminium, 56 (1980), 642-648..
[3] Yu.V. Borisoglebskii, M. I. Karimov, M.M. Vetyukov, S.N. Akhmedov: Refractory Compounds Resistance in Cryolite-Alumina and Aluminium Melts, Tsvetnye Metally, 5 (1992), 34-36.
[4] P.J.M. Gliesse, W.R. Foster: The System Al2O3–B2O3, Nature 195 (1962), 69-70.
[5] S.V. Devyatkin, G. Kaptay: Chemical and Electrochemical Behavior of Titanium Diboride in Cryolite-Alumina Melt and in Molten Aluminium, J. Solid State Chem., 154 (2000), 107-109.