THERMODINAMIC ASPECTS OF HYDROGEN REMOVAL DURING WELDING UNDER FLUORINE-CONTAINING FLUXES
https://doi.org/10.17073/0368-0797-2016-2-99-104
Abstract
The article gives the thermodynamic assessment of the probability of hydrogen removal processes from the welded metal during welding under fl uoride fl ux in standard states at the temperature range 1700 – 2200 K. Na3AlF6 ж , ЅіО2 ж , SiF4 г , NaAlO2 тв , Na2SiO3 ж , CaF2 ж , CaSiO3 тв , Н2 г , SiF2 г , HFг , О2 г , SiFг , Ng have been selected as the standard states for substances reagents. As the result of calculation of standard Gibbs energy and the equilibrium constants of the reactions, it has been determined that the reactions of direct interaction between fl uorine agents of slag with hydrogen and oxygen in metal are the most probable reactions of the interaction with cryolite. In more complex mechanism of interaction involving in the reactions, except fl oriental, silica slag and the possible formation of an intermediate product SiF4 г , process of interaction with the fl uorite is more probable. The calculations have shown the feasibility of using Na3AlF6 compounds with fl uorite for hydrogen removal in submerged-arc welding. The calculations have formed the basis for the development of new compositions of fl ux-additives, protected by patents of the Russian Federation.
About the Authors
R. E. Kryukov
Siberian State Industrial University, Novokuznetsk, Russia
Russian Federation
Russian Federation
Postgraduate of the Chair “Materials, Foundry and Welding Production”
Yu. V. Bendre
Siberian State Industrial University, Novokuznetsk, Russia
Russian Federation
Russian Federation
Cand. Sci. (Chem.), Assist. Professor of the Chair of General and Analytical Chemistry
G. V. Galevskii
Siberian State Industrial University, Novokuznetsk, Russia
Russian Federation
Russian Federation
Dr. Sci. (Eng.), Professor, Director of the Institute of Metallurgy and Materials
N. A. Kozyrev
Siberian State Industrial University, Novokuznetsk, Russia
Russian Federation
Russian Federation
Dr. Sci. (Eng.), Professor, Head of the Chair “Materials, Foundry and Welding Production”
V. F. Goryushkin
Siberian State Industrial University, Novokuznetsk, Russia
Russian Federation
Russian Federation
Dr. Sci. (Eng.), Professor, Head of the Chair of Gene ral and Analytical Chemistry
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For citations:
Kryukov R.E., Bendre Yu.V., Galevskii G.V., Kozyrev N.A., Goryushkin V.F. THERMODINAMIC ASPECTS OF HYDROGEN REMOVAL DURING WELDING UNDER FLUORINE-CONTAINING FLUXES. Izvestiya. Ferrous Metallurgy. 2016;59(2):99-104. (In Russ.) https://doi.org/10.17073/0368-0797-2016-2-99-104
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