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FLUX - Zinc Chloride is used in fluxes for galvanizing, soldering and tinning. Its ability to remove oxides and salts from metal surfaces insures good metal to metal bonding.
AGRICULTURE - Zinc Chloride may be reacted with chelating agents to form solutions of zinc that are biologically available to plants and animals. Zinc is one of the essential elements for plant and animal life.
PETROLEUM - Zinc Chloride is an excellent emulsion breaker and is used to separate oil from water. It is also an effective packer fluid in oil and gas wells due to its high specific gravity.
WATER TREATMENT - Zinc Chloride is used in specialty corrosion inhibitors in cooling towers, potable water, and in gas and oil wells.
MISCELLANEOUS - Zinc Chloride has been used as a catalyst in production of methylene chloride from methyl alcohol. In the textile industry it has found use in resin systems to impart durable press to cotton and synthetic fabrics. It has been used in reclaiming rubber where it dissolves rayon cord. In conjunction with sodium dichromate it has made an excellent wood preservative. Zinc Chloride has found use in the manufacture of glue, diazo dyes, paper, cosmetics, rayon, synthetic fibers, disinfectants and fire fighting foam. In ore refining it has been used as a flotation agent. Zinc Chloride is an excellent source of zinc as a starting material in the production of other zinc chemicals and is an effective catalyst for removing molecules of water, ammonia or mercaptans.
DRY CELL BATTERIES - Zinc Chloride is commonly used in dry cell batteries as an electrolyte where it also acts as a moisture absorbent and corrosion inhibitor. Madison Industries provides a Battery Grade in both a 50% and 62.5% solution.
from duracell's site (fig 1-more)
ADVANTAGES AND APPLICATIONS
Zinc Chloride and Zinc Carbon primary batteries are inexpensive alternatives for low power and intermittent device applications, i.e. flashlights and smoke alarms. In addition to their suitability for infrequent usage applications, Mallory® Super zinc chloride batteries are environmentally-friendly with no added mercury and constructed to be leak resistant.
The can enclosing the cell materials is made of zinc and also functions as the anode. A paste-like sleeve of flour and starch, saturated with electrolyte, lines the inside of the can. The cathode is a core of manganese dioxide and is also infused with electrolyte to ensure adequate contact to the interior. In Zinc Carbon cells the electrolyte solution is made of ammonium chloride and zinc chloride, whereas the Zinc Chloride electrolyte solution is made of zinc chloride only - allowing for better performance characteristics and an added benefit of becoming drier as it discharges. A carbon rod is inserted in the manganese dioxide core and is in direct contact with the cathode material. It acts as the current collector for the cathode. The anode current collector is formed by pressing a metal end closure at the bottom of the zinc can.
The open circuit voltage of zinc chloride and zinc carbon cells is typically 1.5 Volts and the approximate shelf-life is 1 year.