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Lathabai, Sri
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Publications (9/9 displayed)
- 2019Fine Microstructure Control in Additively Manufactured Stainless Steel via Layerwise Rotation of The Scan Direction
- 2019Corrosion Studies of Additive Manufactured Alpha-Beta Ti Alloys
- 2019Corrosion Studies of Additively Manufactured Ti Alpha-Beta Alloys
- 2019Residual Stress in Additive Manufacture
- 2018Additive Manufacturing of Aluminium-based Alloys and Compositescitations
- 2014Welding and weldability of AZ31B by gas tungsten arc and laser beam welding processescitations
- 2013Tin dioxide-based ceramics as inert anodes for aluminium smelting: A laboratory studycitations
- 2013Effect of tool design on the microstructure and microhardness of friction stir processed 5005-H34 aluminium alloy
- 2011Friction stir blind riveting: A novel joining process for automotive light alloyscitations
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Tin dioxide-based ceramics as inert anodes for aluminium smelting: A laboratory study
Abstract
The behaviour of tin dioxide-based ceramics as inert anodes was examined in a laboratory-scale aluminium smelting cell over a range of electrolyte compositions with operating temperatures between 830 -975°C. Anodes of a nominal composition Sn02 (96 wt%), Sb203 (2 wt%) and CuO (2 wt%), were electrolyzed for 90 min at a current density of ~1 A cm"2. The corrosion rate was determined from the tin and copper concentrations in the recovered electrolyte, aluminium metal and the fume. The corrosion rates were 12.5, 1.6 and 6.5 mg (Ah)"1 in electrolytes with bath ratios 1.5 (975°C), 0.89 (903°C) and 0.74 (830°C), respectively. A four-fold increase in corrosion rate was obtained at open-circuit demonstrating the protection provided by oxygen evolution during electrolysis. A preliminary investigation of the dependence of corrosion rate on firing temperatures and additive (Sb203 and CuO) concentrations was conducted using a part-factorial design experiment. Post-electrolysis examination of the anodes using scanning electron microscopy coupled with energy dispersive spectroscopy analysis revealed a depletion of copper from the anode and a build-up of an alumina-rich surface layer under certain conditions.