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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Electrode Technology Symposium for Aluminum Production
Presentation Title Corrosion Behavior of Fe-Ni Alloys as Inert Anodes in Molten KF–AlF3–Al2O3 Salts at 700 °C
Author(s) Dao Cao, Zhongning Shi, Xianwei Hu, Bingliang Gao, Zhaowen Wang
On-Site Speaker (Planned) Dao Cao
Abstract Scope The corrosion behavior of Fe-Ni alloys as inert anodes in molten KF–AlF3–Al2O3 salts at 700 °C under both polarization and non-polarization were in-situ characterized respectively by utilizing electrochemical impedance spectroscopy (EIS). It was shown that the electrochemical impedance spectrums are composed of two capacitive loops in relation to localized corrosion on the protective scale under both of conditions. Due to the preferential dissolution of Fe from the substrate at the open-circuit-potentials, the formation of Ni-rich scale protects the alloy from corrosion under non-polarization. Moreover, the further dissolution of the protection scale leads the irregular localized corrosion. On the contrast, the oxygen coming from the alumina decomposition is discovered on the electrode surface at high anodic polarization potential, which makes the corrosion products composed of Fe-Ni-O serve as an effective barrier to greatly promote the corrosion resistance. Meanwhile, the dissolution of oxides results in the localized corrosion.
Proceedings Inclusion? Planned: Light Metals

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

3D Transient Modelling of a Complete Fire Line for Anode Baking Furnace Design and Optimization
A Study of Anode Baking Gas Composition
An XANES Study of Sulfur Speciation and Reactivity of Cokes Used for Aluminium Production
Analysis on the Material Balance Based on the Calcination Characteristics of a Chamber Calciner
Cathode Structure Optimization Research for Aluminum Reduction Cell
Challenges and Successes of Conducting Trials for Anode Design Modification
Development and Application of Electrocalciners with Increased Calcination Temperature
Development and Application of Large-scale Shaft Kilns
Effect of Changes in Anode Top Cover Composition on Anode Butt Quality
Effect of Cover Material on the Oxidation Speed of Prebaked Anodes
Effects of High-Sulfur Cokes on Physicochemical Properties of Prebaked Anodes in Aluminium Electrolysis
Formation of Aluminium Carbide in Hall-Héroult Electrolysis Cell Environments
Improved Compaction Method for the Production of Large Scale Anode Paste Samples for Thermo-mechanical Characterization
Inert Anodes – the Blind Alley to Environmental Friendliness?
Influence of Crushing Technology and Particle Shape on the Bulk Density of Anode Grade Petroleum Coke
Interaction between Anode Aggregate and Binder in the Sessile Drop Wetting Test
Laboratory Study of the Impact of Cathode Grade on the Formation of Deposits on the Aluminium Cathode Interface in Hall-Héroult Cells
Method of Defining the Degree of Impregnation of the Dry Aggregate with Pitch in the Process of Anode Production
Multi-scale Modelling of TiB2 Degradation Using Crystal Elasticity Model and Density Functional Theory
Numerical Investigation of the Thermomechanical Behaviour of Anode Butt
Opportunities and Challenges Associated to Green Anode Plant Upgrade for Smelter Amperage Creeping
Research and Application for Large Scale, High Efficiency and Energy Saving Baking Furnace Technology
Research on the Penetration of Potassium-based Electrolyte into Dry Barrier Materials
Role of the Porosity of Carbon Anodes in the Nucleation and Growth of Gas Bubbles
Rotary Hearth Calcining of Petroleum Cokes
Simulation on the Initial Stage of Sodium-Graphite Intercalation Using First Principle Calculation
Study on Optimization of Anode Structure for Aluminum Reduction Cell
Study on the Calcination Performance and Desulfurization Mechanism of Petroleum Cokes with Different Sulfur Contents between 700-1100℃
Study on the Property and Desulfurization Mechanisms of Petroleum Cokes with Different Sulfur Contents from 1200℃to 2800℃
Systemic Analysis for the Selection of Anode Baking Furnace Refractories
The Current Status and Development Trend of the Prebaked Anode Market in China
The Research and Industrial Application of An Improved Impact Cleaning Technology of the Double Anode Butts in Aluminium Electrolysis
The Research and Trial of the Aluminum Electrolysis Cells with Current Flowing Out from the Bottom
Transport of Sodium in TiB2 Materials Investigated by a Laboratory Test and DFT Calculations
Understanding the Anode Porosity as a Means for Improved Aluminium Smelting

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