| 摘要 |
<p>A carbon body, in particular a pre-backed anode of an electrolytic cell for the production of aluminium by the electrolysis of alumina in a molten fluoride electrolyte, is treated over its surfaces to improve the resistance thereof to deterioration during operation of the cell by air and oxidizing gases released at the anode, by immersing the body in a treating liquid containing at least one soluble boron compound and at least one additive from the group consisting of aluminium compounds, calcium compounds, sodium compounds, magnesium compounds, silicon compounds, elemental carbon, elemental aluminium, said additive being in the form of a powder, in suspension, as a colloid, or in solution, e.g., at 80° to 120 °C. The same treatment can also be appplied to a carbon mass forming a Söderberg anode and to cell sidewalls. The additives increase strength and improve oxidation resistance compared to impregnation with boric acid alone.</p> |
