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Selected measurements were made on each test material and the test solution to determine any degradation. These physical measurements included weight and dimen- 2 sional changes, blisters/mm , surface area, and blister diameter for each test specimen. Changes in the specific gravity and pH of the zinc chloride also were recorded. An atomic absorption analysis of the test solutions was made to check for any leached-out components. Total organic carbon analyses were performed on some test solutions of promising materials to determine the occurrence of any breakdown of the carbon chains. If samples appeared inert in these screening tests at 25°C and 50°C, each was electrochemically evaluated. Some testing also was conducted in wet chlorine gas and chlorinated water. A pro gram which monitors the change in pH of distilled water, aqueous zinc chloride, and acidic water in relation to the absence and presence of materials also was pursued using the same test system. Further studies in this area are to be conducted during 1978. Electrochemical Tests The purpose of the electrochemical evaluation program is to qualify a material for use in the battery. Materials that are evaluated in this program already have undergone extensive screening in chemical tests and are believed suitable. The electrochemical test is the final evaluation made on a material prior to its more widespread use as a battery construction material. The critical nature of this work demands that extreme care be taken in the operation of the test cells. The introduction of external impurities cannot be tolerated. Test results alone may well determine the acceptance or rejection of a material. For this reason, testing must be an accurate measure of the behavior of the material. Figure 33-2 illustrates a typical standard test cell used for electrochemical evalu ation. These cells were operated until "normal" cycles could be achieved using the following cycling parameters. 33-4PDF Image | Development of the Zinc-Chlorine Battery for Utility
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