About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Aluminum Reduction Technology
|
| Presentation Title |
Chemical Corrosion Pathways in Materials for the Hall-Héroult Process: Lessons from Metals, Ceramics and Cermets |
| Author(s) |
Daniela Bellon Monsalve, Francis Lalancette, Jean-Francois Bilodeau, Francois Allard |
| On-Site Speaker (Planned) |
Daniela Bellon Monsalve |
| Abstract Scope |
Materials proposed for Hall-Héroult environments rarely remain chemically unchanged during exposure to molten fluoride electrolytes. Their performance depends on the interfacial region that develops during operation, including oxide scales, reaction layers, depleted zones and electrolyte-infiltrated regions. This review analyses recent work on metallic alloys, ceramics and cermets from the perspective of how these regions form and evolve. Across the three material classes, nominal phase stability can coexist with continued substrate depletion, grain-boundary penetration or metallic-phase loss, while decreasing corrosion rates may result either from the development of a transport-limiting interfacial region or from selective near-surface depletion that increasingly limits supply from the bulk. Recent processing strategies show that controlling connected penetration paths and the spatial distribution of reactive phases can be as important as composition itself. The comparison also shows why reaction depth, electrochemical response and elemental transfer may give different evaluations of the same material. These observations provide a common basis for interpreting corrosion pathways and identifying when interfacial protection has reached a stable regime. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Aluminum, High-Temperature Materials, Other |