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Although the study is incomplete, the collected data indicates that cell performance will not be as sensitive to the state of the active layer as previously thought. The option of reactivation electrolytically is always available if necessary. Indeed, the very corrosion which this test program is to evaluate may be "reforming" (or regenerating) this active layer at a rate comparable with its destructive effect to the very same entity. A Comparison of Chlor-Alkali Diaphragm Cell Corrosion with the Zinc-Chlorine Battery The consumption of graphite during brine electrolysis in diaphragm cells has been well characterized under conditions employed in chlorine production (28-1). Corrosion leads to two types of corrosion products; . oxides of carbon (predominantly CO^) and particulate graphitic debris. Zinc-chlorine battery conditions are quite different, however, than those employed in chlor-alkali cells. In Table 28-1 the most pertinent differences are presented. Table 28-1 COMPARISON OF OPERATIONAL CONDITIONS FOR GRAPHITE ELECTRODES IN CHLOR-ALKALI DIAPHRAGM CELLS AND THOSE System Parameter pH Temperature, °C Current Density, mA/cm^ Cl Concentration, mole/£ Chlor-Alkali Anode Compartment 3-4 90 - 100 100 - 140 4-6 Zinc-Chlorine Battery Stack +0.5 20 - 50 25 - 50 5 - 11 LIKELY IN ZINC-CHLORINE BATTERY STACKS Of these parameters, it is likely that pH is the most important. Current ineffi ciency in a diaphragm cell (directly proportional to the rate of graphite consump tion) is a linear function of the hydroxyl ion concentration — the discharge of this ion at the anode being principally responsible for current inefficiency in the pH range: 3 to 4. If the mechanism at a pH of 0 were identical and the linear 28-2 1 in 0 1PDF Image | Development of the Zinc-Chlorine Battery for Utility
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