Compositions and methods for inhibiting corrosion in hydrostatic systems

Patent metadata

Field	Value
Publication number	US-10221489-B2
Application number	US-201615007771-A
Country	US
Kind code	B2
Filing date	Jan 27, 2016
Priority date	Jan 23, 2015
Publication date	Mar 5, 2019
Grant date	Mar 5, 2019

Abstract

Compositions and methods for preventing corrosion of equipment having a corrodible metal surface that contacts water in a hydrostatic system are provided. Compositions may include a liquid-phase corrosion inhibitor and vapor-phase corrosion inhibitor. Methods may include introducing into the hydrostatic system a liquid-phase corrosion inhibitor, vapor-phase corrosion inhibitor and/or a scaling inhibitor. A protective film can be formed on the corrodible metal surface.

First claim

What is claimed is:

1. A method of inhibiting corrosion of a corrodible metal surface that contacts water and/or steam in a hydrostatic system, the method comprising:
treating the hydrostatic system with a treatment composition including a liquid-phase corrosion inhibitor that includes a stannous compound,
wherein the treatment composition is provided in a sufficient amount and for a sufficient time to form a stable protective film on at least a portion of the corrodible metal surface, and
the corrodible metal surface is at least a portion of a surface of a metal container that is treated in the hydrostatic system.

2. The method of inhibiting corrosion according to claim 1 , wherein the stannous compound includes a stannous chloride salt.

3. The method of inhibiting corrosion according to claim 1 , wherein the treatment composition further comprises a scaling inhibitor.

4. The method of inhibiting corrosion according to claim 3 , wherein the scaling inhibitor includes a polycarboxylic acid.

5. The method of inhibiting corrosion according to claim 1 , wherein the treatment composition further comprises a polymer dispersant.

6. The method of inhibiting corrosion according to claim 5 , wherein the polymer dispersant includes a 2-acrylamido-2-methylpropane sulfonic acid copolymer.

7. The method of inhibiting corrosion according to claim 1 , wherein the stannous compound is present in the treatment composition in an amount in the range of 1 to 12.5% by weight.

8. The method of inhibiting corrosion according to claim 1 , wherein the concentration of tin in the water of the hydrostatic system is in the range of 0.5 to 100 ppm.

9. The method of inhibiting corrosion according to claim 8 , wherein the concentration of tin in the water of the hydrostatic system is in the range of 1 to 5 ppm.

10. The method of inhibiting corrosion according to claim 1 , wherein the treatment composition is drip-fed into the hydrostatic system.

11. The method of inhibiting corrosion according to claim 1 , wherein the treatment composition is continuously fed into the hydrostatic system.

12. The method of inhibiting corrosion according to claim 1 , wherein the corrodible metal surface is-includes at least a portion of a surface of equipment used in the hydrostatic system.

13. The method of inhibiting corrosion according to claim 12 , wherein the equipment is at least one of a carrier for holding a container, a conveyer for conveying a carrier, a tube, a joint, a chain, a belt, a roller, a partition, and a wall used in the hydrostatic system.

14. The method of inhibiting corrosion according to claim 1 , wherein the container is an aluminum product used in the packaging and storing of food or beverage.

15. The method of inhibiting corrosion according to claim 1 , wherein the treatment composition further comprises a vapor-phase corrosion inhibitor.

16. The method of inhibiting corrosion according to claim 15 , wherein the vapor-phase corrosion inhibitor includes a volatile organic amine compound.

17. The method of inhibiting corrosion according to claim 15 , wherein the vapor-phase corrosion inhibitor is present in the treatment composition in an amount in the range of 1 to 5% by weight.

18. The method of inhibiting corrosion according to claim 15 , wherein the concentration of the vapor-phase corrosion inhibitor in the water of the hydrostatic system is in the range of 5 to 100 ppm.

19. The method of inhibiting corrosion according to claim 15 , wherein a ratio of an amount of the stannous compound and the vapor-phase corrosion inhibitor in the treatment composition is in the range of 1:10 to 10:1.

20. A method of inhibiting corrosion of a corrodible metal surface that contacts water and/or steam in a hydrostatic system, the method comprising:
treating the hydrostatic system with a treatment composition including a liquid-phase corrosion inhibitor that includes a stannous compound,
wherein the treatment composition is provided in a sufficient amount and for a sufficient time to form a stable protective film on at least a portion of the corrodible metal surface,
the treatment composition further comprises a polymer dispersant, and
the polymer dispersant includes a 2-acrylamido-2-methylpropane sulfonic acid copolymer.

21. A method of treating a hydrostatic system to prevent corrosion of a workpiece that passes through the hydrostatic system, the workpiece having a corrodible metal surface that contacts water in the hydrostatic system, the method comprising:
adding to the hydrostatic system a stannous-based liquid-phase corrosion inhibitor;
contacting the workpiece with a water phase in the hydrostatic system; and
forming a stable corrosion-resistant film on at least a portion of the corrodible metal surface.

22. The method of treating a hydrostatic system according to claim 21 , wherein the workpiece is substantially free of an electrolyte coating on the corrodible metal surface.

23. The method of treating a hydrostatic system according to claim 21 , wherein the corrodible metal surface of the workpiece includes aluminum.

24. The method of treating a hydrostatic system according to claim 21 , wherein the workpiece includes a polymeric coating on the corrodible metal surface.

25. The method of treating a hydrostatic system according to claim 21 , wherein the stannous-based liquid-phase corrosion inhibitor is added to the hydrostatic system in a single dose.

26. The method of treating a hydrostatic system according to claim 21 , wherein the workpiece remains in the hydrostatic system for a time period in the range of 2 hours to 3 days.

Assignees

• Chemtreat Inc

Inventors

• Kalakodimi Rajendra Prasad
• Richardson John
• Turner Curt

Classifications

• C23C22/62

  Treatment of iron or alloys based thereon · CPC title

• C23F11/08

  in other liquids · CPC title

• C23F11/02 Primary

  in air or gases by adding vapour phase inhibitors · CPC title