Abstract
A TiB2 wettable cathode coating was deposited on a graphite carbon cathode material via atmospheric plasma spraying (APS). The microstructure and phase composition of the TiB2 coating were analyzed via scanning electron microscopy (SEM), X-ray diffraction (XRD), and energy-dispersive X-ray spectroscopy (EDS). The wettability and corrosion resistance of the coating were studied in a molten-aluminum electrolytic system. The results showed that the surface of the TiB2 coating prepared via plasma spraying was flat and that the main phase of the coating was TiB2. The wettability between the TiB2 coating and liquid aluminum was better than that between graphite cathode carbon block and liquid aluminum. The abilities of the TiB2 coating and graphite cathode carbon block to resist sodium (Na) penetration and prevent molten salt corrosion were compared through a corrosion test. The TiB2 coating was found to have better resistance to Na penetration and better refractory cryolite corrosion resistance than graphite cathode carbon block.
Highlights
Cryolite molten salt electrolysis is the only method for smelting aluminum [1]
Many domestic and foreign studies on TiB2 and its composites mainly focus on TiB2 ceramic cathodes [4,5], TiB2-carbon adhesive coating [6,7,8], TiB2 layer prepared by plating in molten salt [9,10,11], TiB2 non-carbon adhesive coating [12], TiB2 coating prepared via chemical vapor deposition [13], TiB2 coating prepared via selfspreading high-temperature synthesis TiB2 coating [14], and TiB2 coating prepared via plasma spraying [15]
The current study mainly investigates the microstructure of TiB2 coating prepared via atmospheric plasma spraying (APS) under optimal process conditions and the wettability and corrosion resistance of TiB2 coating in a molten-salt electrolytic aluminum system
Summary
Cryolite molten salt electrolysis is the only method for smelting aluminum [1]. Many studies on cathodic carbon blocks have focused on wettable cathodes, among which TiB2 has become a research hotspot, because it is characterized by good wettability to liquid aluminum, low resolution, resistance to electrolyte erosion, and good electrical conductivity [3]. Our research group has conducted numerous studies on the TiB2 coating preparation via atmospheric plasma spraying (APS) and has achieved certain results. Through several orthogonal experiments on spraying parameters, the best process conditions for the coating preparation have been obtained [16]. The current study mainly investigates the microstructure of TiB2 coating prepared via APS under optimal process conditions and the wettability and corrosion resistance of TiB2 coating in a molten-salt electrolytic aluminum system
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