| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Aluminum Reduction Technology
|
| Presentation Title |
Correlation Between Corrosion Rate and Electrochemical Parameters of Anode Process on a Metallic Electrode in Molten Oxyfluorides |
| Author(s) |
Andrei Iasinskii, Thomas Jamieson, Kamaljeet Singh, Guðmundur Gunnarsson, Jon Magnússon, Dominic Feldhaus, Roman Düssel, Isabella Gallino, Bernd Friedrich |
| On-Site Speaker (Planned) |
Andrei Iasinskii |
| Abstract Scope |
Using metallic anodes enables oxygen evolution during the aluminum reduction in electrolysis cells with vertical electrodes. Although they are considered non-consumable, they tend to corrode in molten fluoride media, and the corrosion products end up in aluminum as impurities. The big challenge for the industry is finding the best conditions (anode and bath composition, temperature, and current density) that provide the lowest corrosion rate. The most reliable way to characterize the corrosion rate is to perform an electrolysis test and determine the mass of anode components in the produced aluminum. This method is highly time- and resource-demanding. This paper investigates the connection between the electrochemical parameters of the anode process, which can be measured in minutes, and the results of long-term electrolysis tests. Exchange current density on clean and oxidized surfaces was studied in the low-temperature KF-NaF-AlF3-Al2O3 melt at 800 °C. A linear dependency between exchange currents and corrosion rate was found. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Aluminum, Electrometallurgy, Characterization |