. The Bell System technical journal . Fig. 7—Aluminum electrolytic condenser, showing construction of the electrodes The material for the positive plates is aluminum of special com-position, selected on a basis of properties which influence the formationof the film, the leakage current and the life of the metal. In general,the higher the purity of the aluminum the more rapid is the formationof the film and the lower is the resultant leakage current. It has been noticed that the unit-area capacity for high-purity THE ALUMINUM ELECTROLYTIC CONDENSER 53 metals is slightly lower than for metals co
. The Bell System technical journal . Fig. 7—Aluminum electrolytic condenser, showing construction of the electrodes The material for the positive plates is aluminum of special com-position, selected on a basis of properties which influence the formationof the film, the leakage current and the life of the metal. In general,the higher the purity of the aluminum the more rapid is the formationof the film and the lower is the resultant leakage current. It has been noticed that the unit-area capacity for high-purity THE ALUMINUM ELECTROLYTIC CONDENSER 53 metals is slightly lower than for metals containing small quantitiesof alloying materials, but this difference is of inconsequential im-portance. The difference in the rate of film formation under similarconditions between per cent aluminum and per cent aluminumis shown in Fig. 8. After 24 hours in these particular cases the. 20 30 40 TIME OF FORMATION-MINUTES 50 60 Fig. 8—Rate of film formation as influenced by composition of metal
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