Granted Patent B2

US 12,398,473 · App. 18/627,968 · Granted Aug 26, 2025

Inventors: Janine Clemens (Minnetonka, MN); Robert Hendel (Minnetonka, MN); Paul Frail (Minnetonka, MN); Judy Barron (Minnetonka, MN)

Assignee: BL TECHNOLOGIES, INC.

C23F11/182C02F5/105C02F5/145C02F2103/023

Abstract

Claims (26)

1. A method for corrosion control in aqueous systems, the method comprising:

providing a formulation, the formulation comprising an aluminum corrosion inhibitor and (i) a polycarboxylic acid polymer, (ii) a sulfonic acid polymer, (iii) a combination of a polycarboxylic acid and a polysulfonic acid, (iv) an organic phosphonate, (v) a combination of a phosphonate and a polycarboxylic acid, or (vi) a combination of a phosphonate and a polysulfonic acid; and

delivering the formulation to an aqueous stream in an amount of about 1 ppm to about 1000 ppm,

wherein the formulation has a pH range that is (a) less than 4, or (b) is greater than 10.

2. The method as recited in claim 1 , wherein the aluminum corrosion inhibitor comprises an aluminum salt.

3. The method as recited in claim 2 , wherein the aluminum salt comprises aluminum halides, aluminum sulphate, aluminum hydroxide, aluminum phosphate, aluminum oxide, sodium aluminate, or combinations thereof.

4. The method as recited in claim 1 , wherein the aluminum corrosion inhibitor comprises complexes of (i) citrate and aluminum, (ii) saccharic acid and aluminum, or (iii) aluminum and gluconate.

5. The method as recited in claim 1 , wherein the aluminum corrosion inhibitor is selected from the group consisting of aluminum sulfate and sodium aluminate.

6. The method as recited in claim 5 , wherein the aluminum corrosion inhibitor is aluminum sulfate and is present at a concentration of approximately 0.1-2 wt % actives.

7. The method as recited in claim 5 , wherein the aluminum corrosion inhibitor is sodium aluminate is present at a concentration of approximately 0.1-2 wt % actives.

8. The method as recited in claim 1 , wherein the formulation comprises polymaleic acid, polycarboxylic sulfonic acid polymer, polyacrylic acid, hydroxyacids, phosphonocarboxylic acids, polyhydroxysuccinic acids, polymaleic anhydride, phosphonates, 1-Hydroxy Ethylidene-1,1-Diphosphonic Acid, 2-Phosphonobutane-1,2,4-tricarboxylic acid, amino alkylene phosphonic acids, polymers featuring one monomeric group with a phosphonic acid, or combinations thereof.

9. The method as recited in claim 8 , wherein the formulation comprises a polycarboxylic sulfonic acid polymer.

10. The method as recited in claim 8 , wherein the formulation comprises a polymaleic acid/polycarboxylic sulfonic acid polymer blend.

11. The method as recited in claim 1 , wherein the formulation comprises a polycarboxylic acid polymer, and the polycarboxylic acid polymer is present at a concentration of about 3 to about 50% polymer actives.

12. The method as recited in claim 11 , wherein the concentration ratio of the aluminum corrosion inhibitor to the polycarboxylic acid polymer is greater than about 1:100.

13. The method as recited in claim 1 , wherein the aqueous stream comprises an industrial water-cooling system.

14. The method as recited in claim 1 , wherein the formulation has a pH that is less than 2.

15. The method as recited in claim 1 , wherein the formulation has a pH that is greater than 12.

16. A method for corrosion control in aqueous systems, the method comprising:

providing a formulation, the formulation comprising an aluminum corrosion inhibitor and (i) a polycarboxylic acid polymer, (ii) a sulfonic acid polymer, (iii) a combination of a polycarboxylic acid and a polysulfonic acid, (iv) an organic phosphonate, (v) a combination of a phosphonate and a polycarboxylic acid, or (vi) a combination of a phosphonate and a polysulfonic acid; and

delivering the formulation to an aqueous stream,

wherein the aluminum corrosion inhibitor is aluminum sulfate or sodium aluminate, wherein the aluminum corrosion inhibitor is present at a concentration of approximately 0.1-2 wt % actives, and wherein the pH of the formulation is (a) less than 4, or (b) greater than 10.

17. A method for corrosion control in aqueous systems, the method comprising:

providing a formulation, the formulation comprising an aluminum corrosion inhibitor and (i) a polycarboxylic acid polymer, (ii) a sulfonic acid polymer, (iii) a combination of a polycarboxylic acid and a polysulfonic acid, (iv) an organic phosphonate, (v) a combination of a phosphonate and a polycarboxylic acid, or (vi) a combination of a phosphonate and a polysulfonic acid; and

delivering the formulation to an aqueous stream,

wherein the pH of the formulation is greater than 12.

Assignments (1)

Continuity (3)

References Cited (17)