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AN INVESTIGATION OF ELECTRODE PROCESSES BY MICROSCOPY. PART 2. THE MICROSTRUCTURE OF LEAD DIOXIDE AND SPONGE LEAD PLATES AS INFLUENCED BY DIFFERENT TEMPERATURES, ELECTROLYTE SPECIFIC GRAVITIES, AND CURRENT DENSITIES IN THE FORMING PROCESS
NAVAL RESEARCH LAB WASHINGTON DC
Battery plates were formed at specific gravities of electrolyte ranging from 1.05 to 1.45, at temperatures from 4 to 30 deg C, and at current densities from 0.023 to 2.3 ampsq dm approximately 0.23 to 23 ampsq ft. All samples received a total current that was 14 of that required for complete formation of a similar plate under the arbitrarily chosen conditions of 30 deg C, 0.23 ampsq dm current density, and acid specific gravity of 1.050. The plates were impregnated with plastic, sectioned, and polished. The area of formed PbO2 in the positive plate increased as the specific gravity of the acid decreased. The greatest area of PbO2 formation occurred at a current density of 0.023 ampsq dm. The formed area in the negative plate was greatest at an acid specific gravity of about 1.25. The area of formed material increased as the current density was decreased to 0.23 ampsq dm, but no increase was observed at lower current density.
See also part 1, NRL-5679.
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