Carbon bodies resistant to deterioration by oxidizing gases

Details Carbon bodies resistant to deterioration by oxidizing gases Carbon bodies resistant to deterioration by oxidizing gases

1996-01-10

1998-05-19

Kalafut, Stephen

Chemistry: electrical current producing apparatus, product, and

Having earth feature

204290R, 502101, 427113, 4271261, H01M 488, H01M 496

Patent

active

057533822

ABSTRACT:
A carbon body, in particular a prebaked anode of an electrolytic cell for the production of aluminum 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 a soluble boron compound and at least one aluminum compound and/or at least one calcium compound as a powder, suspension or colloid or in solution, e.g. at 80.degree. to 120.degree. C. The same treatment can also be applied to a carbon mass forming a Soderberg anode and to cell sidewalls. The addition of the aluminum and/or calcium compound(s) increases strength and improves oxidation resistance compared to impregnation with boric acid alone.

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