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! APPLIED VOLTAGE—volts dc Figure 24-12. Plot of corrosion current measurements made on 8.3kWh submodule test stand at various chlorine concentrations. Note: Test conducted with 3M ZnCl2 at 30°C. voltages. Furthermore, both charge and discharge corrosion currents will be the same for the same chlorine concentration. These diffusion-limited currents at 1.0, 1.5, and 2.Og/l chlorine concentration are plotted in Figure 24-13. Based on the electrode area per unit cell and the slope of this line, the calculated corrosion 2 current density under these conditions is 1.31mA/cm /g/l. This value is approxi- 2 mately half the value of 2.36mA/cm /g/l projected by extrapolating zinc weight-loss data obtained on rotating hemispheres (24-1). These values, acquired by different measuring techniques, were obtained in different electrolytes having different pH values, and at different temperatures. Also the surface roughness of the zinc during the weight-loss measurements could have increased turbulence in the diffusion layer causing a somewhat higher value for the corrosion current. 24-19 1.50 CPDF Image | Development of the Zinc-Chlorine Battery for Utility
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