Patent ID: 8715404

Claim:
A water-reactive Al composite material comprising 4NAl or 5NAl which contains added In in an amount ranging from 2 to 5% by mass; and Si including the Si as a contaminant of Al in a total amount ranging from 0.04 to 0.6% by mass, on the basis of the amount of Al, wherein the In and Si are uniformly dispersed in the Al, and wherein even after a water-reactive Al film, which is produced by melting the composite material in such a manner that the resulting molten material has a uniform composition, thermally spraying the molten material on the surface of a base material, and then solidifying the sprayed molten material through quenching to thus form a film in which the In and Si are uniformly dispersed in an Al crystalline grains, is subjected to an influence of a thermal hysteresis within a film-forming chamber of a film-forming apparatus in which an upper limit of a thermal hysteresis temperature is on an order of 300 to 350° C., a reaction current density, as determined by immersing the base material covered with the Al film in warm water maintained at a temperature ranging from 40 to 130° C., is not less than 50 mA/cm 2 .