Patent ID: 6464901
Filing Date: 2002-10-15
Classification: C09K,C23F

Abstract:
Corrosion inhibitors for copper surfaces contacted by an aqueous system being treated with an oxidizing halogen biocide, consisting essentially of non-halogenated, nitrogen containing, aromatic compounds which:a) exhibit an 18 hour coverage corrosion rate for copper of less than about 0.3 mpy in said aqueous system in the absence of halogen; and b) exhibit a 22 hour average corrosion rate for copper of less than about 2.5 mpy in said aqueous system after treatment with about 5 ppm of halogen; and c) exhibit a free chlorine concentration, in said aqueous system, of at least about 4.0 ppm of 19 hours after said aqueous system is treated with about 5 ppm chlorine; and d) exhibit a free chlorine concentration, in said aqueous system, of at least about 2.0 ppm at 40 hours after said aqueous system is treated with about 5 ppm chlorine.