Abstract: A method of producing a polymer coated bullet jacket comprises applying a polymer to a substrate and drawing the substrate. The coating provides sufficient thickness, ductility and durability to replace the conventional copper/zinc jacketing layer, but also has an appropriate amount of flexibility and adhesion to the substrate to allow the substrate to be formed into the bullet jacket after the polymer coating is applied. A bullet jacket comprises a ferrous or aluminum substrate and a polymer layer bound to the substrate and is essentially devoid of a metal layer on the ferrous substrate. A bullet jacket may also comprise a metal substrate, and a polyethylene terephthalate layer bound to the substrate. A coated steel strip comprises a metal substrate and a polymer layer bound to the substrate, where the polymer layer has a Taber abrasion resistance less than 20 mg wear per 250 revolutions.

Abstract: The electrical resistance aging properties of a coating intended for use on a base material in a primary alkaline cell battery are be tested by manufacturing at least one test device, measuring a first and a second electrical resistance across two distinct circuits in the device, and calculating the effective electrical resistance at the interface between a cathode mix and a coated surface of the base material as the difference between the two electrical resistances. By storing the test device at temperatures above ambient, the aging properties of the coated surface resistance are estimated by repeating the electrical resistance measurements at predetermined time intervals at ambient temperature.

Abstract: Novel plating baths and the processes for plating therewith are disclosed which provide corrosion-resistant nickel/zinc alloy coatings containing 13-15 weight/% of nickel for iron or steel substrates. The novel baths have combined nickel and zinc contents in the range of 14 to 24 ounces of metal per gallon with the ratio of nickel to zinc maintained in the range 0.1:0.4. These baths permit satisfactory plating of the alloy to be achieved at current densities in the range 30 to 120 amperes per square foot. At alloy coating thicknesses in the range 0.00005 to 0.0005 inches, a salt spray corrosion resistance in excess of 0.5 hours per microinch is afforded. Additionally, by coating the substrate, before alloy plating, with a substantially pure nickel priming layer, the corrosion resistance rate can be effectively doubled. Apparatus for the continuous plating of the priming layer and the corrosion-resistant alloy layer is also described.