Patent ID: 8722592

Claim:
A method comprising the following steps: (a) providing a composition comprising one or more triazoles in an amount of at least about 250 ppm (single strength usage basis) effective to reduce cobalt leaching from a metal working tool comprising cobalt, wherein the one or more triazoles comprise from about 2 to 100% by weight of a sodium salt of butyl-benzotriazole, or a mixture of butyl-benzotriazole and the sodium salt of butyl-benzotriazole, and from 0 to about 98% by weight of a mixture of benzotriazole and tolyltriazole in a weight ratio of benzotriazole to tolyltriazole of from about 1:10 to about 10:1; and (b) contacting a metal working tool with the composition of step (a) during a metal working process, wherein the metal working tool comprises cobalt.