Composition and method for controlling copper discharge and erosion of copper alloys in industrial systems

1. A method of reducing copper ion discharge from an open aqueous system, the open aqueous system having a copper-containing surface in contact with the water of the open aqueous system, the method comprising:

adding to the open aqueous system a composition comprising a synergistic combination of (i) benzotriazole and/or salt(s) thereof and (ii) a substituted benzotriazole and/or salt(s) thereof,

wherein said composition provides an erosion-resistant barrier on the copper-containing surface, and wherein said combination is resistant to degradation by exposure to halogen ions in the water of the open aqueous system and resistant to high turbidity of the open aqueous system,

wherein the substituted benzotriazole and/or salt(s) thereof is selected from the group consisting of chlorobenzotriazole and/or salt(s) thereof, and nitrobenzotriazole and/or salt(s) thereof.

2. The method of claim 1 , wherein the weight-to-weight ratio of (i):(ii) or (ii):(i) is from about 0.001:100 to about 100:0.001.

3. The method of claim 1 , wherein the weight-to-weight ratio of (i):(ii) of (ii):(i) is from about: 0.1:20 to about 20:0.10.

4. The method of claim 1 , wherein the weight-to-weight ratio of (i):(ii) or (ii):(i) is from about 0.1:10 to about 10:0.1.

5. The method of claim 1 , wherein the weight-to-weight ratio of (i):(ii) or (ii):(i) is from about 1:10 to about 10:1.

6. The method of claim 1 , wherein the weight-to-weight ratio of (i):(ii) or (ii):(i) is from about 1:5 to about 5:1.

7. The method of claim 1 , wherein the weight-to-weight ratio of (i):(ii) or (ii):(i) is from about 1:3 to about 3:1.

8. The method of claim 1 , including adding at least about 0.01 ppm of the composition, based on the total weight of the water in the open aqueous system being treated.

9. The method of claim 1 , including adding from about 0:1 to about 500 ppm of the composition, based on the total weight of the water in the open aqueous system being treated.

10. The method of claim 1 , including adding from about 0.5 to about 100 ppm of the composition, based on the total weight of the water in the open aqueous system being treated.

11. The method of claim 1 , wherein the weight-to-weight ratio of (i):(ii) or (ii):(i) is from about 0.5:99.5 to about 99.5:0.5.

12. A method of reducing copper ion discharge from an open aqueous system, the open aqueous system having a copper-containing surface in contact with the water of the open aqueous system, the method comprising:

adding to the open aqueous system a composition comprising a synergistic combination of (i) tolyltriazole and/or salt(s) thereof and (ii) a substituted benzotriazole and/or salt(s) thereof,

wherein said composition provides an erosion-resistant barrier on the copper-containing surface, and wherein said combination is resistant to degradation by exposure to halogen ions in the water of the open aqueous system and resistant to high turbidity of the open aqueous system;

wherein the substituted benzotriazole and/or salt(s) thereof is selected from the group consisting of chlorobenzotriazole and/or salt(s) thereof, and nitrobenzotriazole and/or salt(s) thereof.

13. The method of claim 12 , including adding at least about 0.01 ppm of the composition, based on the total weight of the water in the open aqueous system being treated.

14. The method of claim 12 , including adding from about 0.1 to about 500 ppm of the composition, based on the total weight of the water in the open aqueous system being treated.

15. The method of claim 12 , including adding from about 0.5 to about 100 ppm of the composition, based on the total weight of the water in the open aqueous system being treated.

16. The method of claim 12 , wherein the weight-to-weight ratio of (i):(ii) or (ii):(i) is from about 0.5:99.5 to about 99.5:0.5.

17. The method of claim 12 , wherein the weight-to-weight ratio of (i):(ii) or (ii):(i) is from about 0.001:100 to about 100:0.001.

18. The method of claim 12 , wherein the weight-to-weight ratio of (i):(ii) or (ii):(i) is from about 0.1:20 to about 20:0.10.

19. The method of claim 12 , wherein the weight-to-weight ratio of (i):(ii) or (ii):(i) is from about 0.1:10 to about 10:0.1.

20. The method of claim 12 , wherein the weight-to-weight ratio of (i):(ii) or (ii):(i) is from about 1:10 to about 10:1.

21. The method of claim 12 , wherein the weight-to-weight ratio of (i):(ii) or (ii):(i) is from about 1:5 to about 5:1.

22. The method of claim 12 , wherein the weight-to-weight ratio of (i):(ii) or (ii):(i) is from about 1:3 to about 3:1.