Corrosion resistant cemented carbide

Claim 1

A corrosion resistant cemented carbide composite comprising a granular tungsten carbide phase, a semi-continuous solid solution carbide phase extending closely adjacent at least a portion of said grains of tungsten carbide for enhancing corrosion resistance, and a substantially continuous metal binder phase, said cemented carbide composite consisting essentially of an effective amount of an anti-corrosion additive, from about 4 to about 16 percent by weight metal binder phase, and with the remaining portion being from about 84 to about 96 percent by weight metal carbide wherein said metal carbide consists essentially of from about 4 to about 30 percent by weight of a transition metal carbide or mixtures thereof selected from Group IVB and Group VB of the Periodic Table of Elements and from about 70 to about 96 percent tungsten carbide, said metal binder phase consists essentially of nickel and from about 10 to about 25 percent by weight chromium, said effective amount of an anti-corrosion additive being selected from the group consisting essentially of copper, silver, tin and combinations thereof.