CORROSION INHIBITORS FOR INHIBITING CORROSION OF COPPER SURFACES

摘要

"CORROSION INHIBITORS FOR INHIBITING CORROSION OF COPPER SURFACES" Corrosion inhibitors for inhibiting corrosion of copper surfaces contacted by an aqueous system being treated with an oxidizing halogen biocide, comprising a non-halogenated, substituted benzotriazole selected from the group consisting of: 5,6-dimethylbenzotriazole; 5,6-diphenylbenzotriazole; 5-benzoyl-benzotriazole; 5-benzylbenzotriazole and 5-phenyl-benzotriazole which: (a) exhibit an 18 hour average copper corrosion rate of less than 0.0076 millimeters per year (0.3 mpy) in said aqueous system in the absence of oxidizing halogen biocide treatment of said aqueous system; and (b) exhibit a 22 hour average copper corrosion rate of less than 0.06 millimeters per year (2.5 mpy) in said aqueous system after treatment of said aqueous system with 5 ppm of oxidizing halogen biocide; and (c) exhibit a free chlorine concentration, in said aqueous system, of at least 4.0 ppm at 19 hours after said aqueous system is treated with 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 5 ppm chlorine.