Abstract
The anodic deposition of cerium oxide from cryolite melts onto tin oxide substrates was investigated. Such a coated structure offers promise as an oxygen-evolving anode in Hall-Heroult cells. The development and dimensional stability of the coating is established by the equilibrium between the bath components and the cerium oxide. The coating thickness and morphology is shown to be dependent on the initial cerium oxide bath concentration and, to a lesser extent, on current density. The presence of the cerium oxide coating greatly diminishes dissolution of the anode substrate and increases the purity of the electrowon aluminum. The protection afforded by the coating is achieved by reducing the exposed substrate surface area.
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Walker, J.K., Kinkoph, J. & Saha, C.K. The development of cerium oxide coatings from cryolite melts. A self-forming anode for aluminum electrowinning. J Appl Electrochem 19, 225–230 (1989). https://doi.org/10.1007/BF01062305
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DOI: https://doi.org/10.1007/BF01062305