for 1000 ppm a weight of 261 4 grams of nickel chloride is desired thus to allow for possible weapon volume variations 300 grams of nickel chloride is employed in each of the corrosion inhibitor tablets 12 of the present invention a quantity of 300 grams of nickel chloride 200 grams of sodium bicarbonate and 100 grams of citric acid is contained within each tablet formed to give a ratio of 3 2 1 for the active ingredients large quantities containing this ratio of materials are mixed together and pressed into multiple individual tablets in a conventional manner when desired a conventional inert and water soluble binder component may also be added to the mixture to facilitate tablet formation one or more tablets 12 each having a total weight of 600 grams or 1 3 pounds may then be easily inserted through breech door 13 into the submarine weapon tube 11 when weapon 16 is loaded therein tablets containing 300 grams of the corrosion inhibitor will completely disperse in the 9 ft 3 of seawater normally provided during flood down of the loaded tube and maintained therein while the tube is loaded to result in a concentration of at least 1000 ppm nickel chloride in seawater 28 contained within the loaded tube this concentration of corrosion inhibitor material is adequate to chemically effect a cation film coating of the corrosion inhibitor material on any exposed aluminum or aluminum oxide surface on weapon 16 where more or less concentrations of the corrosion inhibitor material.