Influence of operating conditions on cermet inert anode corrosion in cryolite for aluminium production
Source abstract
Abstract
Abstract A (NixFeyO4–Ni1−x′Fex’O)/(Cux′’Niy’’) cermet candidate as inert anode was investigated in cryolite at 960 °C. Immersion tests were performed and different conditions tested: cryolite ratio, alumina content, electrolyte quality, metallic aluminium content and atmosphere. Then, electrolysis was realised at 0.8 A cm-2 for 4 h in industrial conditions: industrial grade electrolyte, CR 2.2, saturated Al2O3, 960 °C and presence of metallic Al. The initial material composition was still present in the bulk and the phases compositions in the oxidised zone are Ni0.90Fe2.10O4 and Ni0.90Fe0.10O, as observed during immersion tests. The metallic phase is partly oxidised, leading to porosity in the cermet.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Molten salt chemistry and electrochemical processes · Bauxite Residue and Utilization · Extraction and Separation Processes
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (19)
Show source-provided references
1. Charles-M. Hall, U.S. Patent 400766, 1889.
2. U.S. Department of Energy, Inert Anode Roadmap, Report of The Aluminium Association Inc, 1998.
3. Layer growth mechanisms on metallic electrodes under anodic polarization in cryolite-alumina melt10.1016/j.corsci.2013.10.040 ↗
4. Oxidation and corrosion of highly alloyed Cu–Fe–Ni as inert anode material for aluminum electrowinning in as-cast and homogenized conditions10.1016/j.corsci.2012.06.013 ↗
5. Nickel ferrite as inert anode in aluminium electrolysis: Part II – material performance and long-term testing and preliminary testing10.1023/A:1003464304488 ↗
6. Fabrication and characterization of nickel ferrite based inert anodes for aluminum electrolysis10.1007/s11665-014-0914-y ↗
7. Preparation and preliminary testing of cermet inert anode for aluminium electrolysis
8. Corrosion and passivation of cermet inert anodes in cryolite-type electrolytes
9. S.P. Ray, Composition for Inert Electrodes, Aluminum Company of America U.S. Patent 4399008, 1980.
10. S.P. Ray, Inert Electrode Formulation, Aluminum Company of America U.S. Patent 4374761, 1980.
11. Oxidation kinetics of a Ni–Cu based cermet at high temperature10.1016/j.corsci.2012.11.007 ↗
12. Corrosion of NiFe2O4-10NiO-based cermet inert anodes for aluminium electrolysis10.1016/S1003-6326(13)62934-9 ↗
13. Preliminary testing of NiFe2O4-NiO-Ni cermet as inert anode in Na3AlF6-AlF3 melts10.1016/S1003-6326(06)60116-7 ↗
14. Corrosion behavior of nickel ferrite-based ceramics for aluminium electrolysis cell
15. Corrosion of nickel ferrite refractory by Na3AlF6-AlF3-CaF2-Al2O3 bath10.1016/j.jeurceramsoc.2013.04.022 ↗
16. Electrochemical degradation mechanism of a cermet anode for aluminum production
17. C. Barthelemy, S. Bouvet, G. Armand, V. Laurent, A. Marmottant, US Patent US2017130351A1, 2017.
18. Chemical reactions of Sulphur species in cryolite-based melts
19. Young, Solubilities of oxides for inert anodes in cryolithe-based melts