| abstract |
Solutions of mixtures of benzotriazole and tolyltriazole in water and organic solvents such as benzene and tetrachloroethylene are disclosed. The aqueous solutions contain 40 to 98 percent by weight of benzotriazole and from 60 percent to 2 percent by weight of tolyltriazole, on a solid basis. The aqueous solutions may also contain sodium hydroxide, potassium hydroxide or another pH control agent, and may also contain isopropanol, ethylene glycol or another organic solubilizer that is soluble in water. Aqueous solutions according to the invention are useful as additives for cooling water because of the ability of both benzotriazole and tolyltriazole to inhibit metal corrosion. The benzene solutions contain 2 to 98 percent by weight of benzotriazole and from 98 percent to 2 percent by weight of tolyltriazole, on a solids basis. The tetrachloroethylene solutions contain 2 to 98 percent by weight of benzotriazole and from 98 to 2 percent by weight of tolyltriazole, on a solids basis. Benzene benzotriazole/tolyltriazole solutions are useful in unleaded gasolines, and tetrachloroethylene - benzotriazole/tolyltriazole solutions are useful as dry-cleaning or metal-cleaning additives. Benzotriazole/tolyltriazole impregnated paper for use as a vapor phase corrosion inhibitor for copper and copper alloys may be produced without the use of a solvent system. |