FIELD: metallurgy.
SUBSTANCE: procedure for protection of cathode unit of aluminium electrolyser consists in application of coating on carbon sole blocks. Upper surface of carbon sole blocks is preliminary impregnated with water solutions of pure salts of aluminium or with mixture of aluminium salts with sodium salts and conditioned during 20-30 minutes. Also graphite blocks impregnation and drying is alternated 2-4 times to increase depth of impregnation and to reduce cross section of pores.
EFFECT: efficient protection of cathode unit and elimination of contamination in electrolytic aluminium with metal impurities.
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