Cathode protection

Details Cathode protection Cathode protection

C - Chemistry, Metallurgy

23

F

204/48, 204/88.5

C23F 13/08 (2006.01) C25C 3/06 (2006.01) C25C 3/08 (2006.01)

Patent

CA 2010316

A method of operating an aluminium smelting cell during the start-up phase of the cell comprising forming a layer of boron oxide on the exposed surface of the cathode of the cell, forming a layer of aluminium on the boron oxide layer, said boron oxide layer forming a barrier impervious to oxygen at temperature from 400°C to about 650°C, and said aluminium layer forming a barrier to oxygen at temperatures above about 600°C up to temperatures of about 1000°C thereby reducing the development of oxidation products in the cathode during cell start-up.

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