Corrosion inhibition of hypochlorite solutions in saturated wipes

• US 8,557,178 B2
• Filed: 07/13/2012
• Issued: 10/15/2013
• Est. Priority Date: 12/21/2010
• Status: Active Grant

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Inventors: Olson, Erik C., Smith, Kim R., Lentsch, Steven E., Tischler, Sherri L.
• Primary Examiner(s): ANTHONY, JOSEPH DAVID
• Application Number:
  US13/548,367
• Publication Number:
  US 20120273374A1
• Time in Patent Office: 459 Days
• Field of Search: 422/7, 252/389.52, 252/389.61, 252/389.62, 252/396, 252/400.52, 252/400.61, 252/400.62, 252/407, 252/187.24, 252/187.25, 252/187.26, 252/187.27, 252/187.28, 252/187.29, 252/187.3, 205/466, 205/556, 205/746, 205/756, 205/563, 205/265
• US Class Current: 422/7
• CPC Class Codes: C01B 11/06 Hypochlorites
• CPC Class Codes: C23F 11/08 in other liquids
• CPC Class Codes: C23F 11/124 Carboxylic acids
• CPC Class Codes: C23F 11/173 Macromolecular compounds
• CPC Class Codes: C23F 11/18 using inorganic inhibitors
• CPC Class Codes: C23F 11/187 Mixtures of inorganic inhibitors
• CPC Class Codes: Y10T 442/20 Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer

Abstract

Corrosion inhibitor compositions and methods of use are disclosed. Corrosion inhibitors are selected from polyacrylate and calcium corrosion inhibitors, zinc and calcium corrosion inhibitors and/or sugar acids and calcium corrosion inhibitors combined with hypochlorite sources provide use solutions for effective corrosion inhibition for metal surfaces.

Claims

1. A method for cleaning, sanitizing and/or disinfecting a surface contacted by a hypochlorite source comprising:

providing a liquid corrosion inhibitor composition in a saturated wipe, wherein the liquid corrosion inhibitor composition comprises a hypochlorite source and a corrosion inhibitor comprising a water soluble calcium salt and a member selected from the group consisting of a water soluble zinc salt, a non-thickening polymeric salt having a molecular weight less than about 10,000, and a sugar acid, and wherein the wipe is a woven or non-woven material, wherein the pH of said composition is at least about 7, the ratio of said hypochlorite source to corrosion inhibitor is from about 10;

1 to about 600;

1 and the ratio of said zinc salt, polymeric salt or sugar acid to said calcium salt is from about 6;

1 to about 1;

6; and

contacting said corrosion inhibitor composition with a surface in need of cleaning, sanitizing and/or disinfecting, wherein said composition inhibits the corrosion and/or discoloration of said surface in the presence of said hypochlorite source.

2. The method according to claim 1, wherein said corrosion inhibitor concentration in said saturated wipe is from about 25 ppm to about 3000 ppm, and wherein said hypochlorite source concentration in said saturated wipe is from about 500 ppm to about 30,000 ppm.

3. The method according to claim 1, wherein said corrosion inhibitor simultaneously controls corrosive mechanisms of sodium hypochlorite, sodium chloride, and sodium hydroxide of said hypochlorite source and prevents discoloration of the surface, wherein said hypochlorite source is free of carbonate and bicarbonate anions, and wherein said corrosion inhibitor is free of bromide, iodide, aluminum and magnesium.

4. The method according to claim 1, wherein said surface is metal, and wherein said surface loses less than about 0.1% of its weight in the presence of said corrosion inhibitor composition.

5. The method of claim 1, further comprising forming a corrosion-inhibiting layer on said surface.

6. A corrosion inhibitor article comprising:

a woven or non-woven material forming a wipe saturated with a liquid corrosion inhibitor composition;

wherein said

liquid corrosion inhibitor composition comprises a hypochlorite source and a corrosion inhibitor comprising a water soluble calcium compound and a member selected from the group consisting of a zinc compound, a polyacrylate compound, and a sugar acid, wherein the pH of said composition is at least about 7 and wherein the composition does not cause corrosion and/or discoloration on a treated metal surface.

7. The article according to claim 6, wherein said hypochlorite source includes sodium hypochlorite and at least one of sodium chloride and sodium hydroxide, wherein said hypochlorite source is free of carbonate and bicarbonate anions.

8. The article according to claim 6, wherein the ratio of said hypochlorite source to corrosion inhibitor is from about 10:

1 to about 600;

1.

9. The article according to claim 6, wherein said corrosion inhibitor is an EPA approved inert material for antimicrobial formulations and does not adversely impact the stability of the hypochlorite source.

10. The article according to claim 6, wherein said corrosion inhibitor is a water soluble zinc salt and a water soluble calcium salt, wherein said salts have a chloride or non-halide anion and are not effective as oxidizing agents or reducing agents.

11. The article according to claim 10, wherein the zinc salt includes zinc chloride and/or zinc sulfate and the ratio of said zinc salt to said calcium salt is from about 4:

1 to about 1;

4.

12. The article according to claim 6, wherein said corrosion inhibitor is a water soluble, non-thickening polymeric salt having molecular weight less than about 7,000 and a water soluble calcium salt, wherein said salts have a chloride or non-halide anion.

13. The article according to claim 12, wherein said polymeric salt is sodium poly acrylate or sodium methacrylate and said calcium salt is calcium chloride or calcium sulfate.

14. The article according to claim 6, wherein said corrosion inhibitor is a sugar acid and a water soluble calcium salt, wherein said salts have a chloride or non-halide anion, and wherein the ratio of said sugar acid to said calcium salt is from about 4:

1 to about 1;

4.

15. The article according to claim 6, wherein the liquid corrosion inhibitor composition is free of phosphate, silicate, aluminum and triazole compounds.

22. A kit comprising:

a container containing the article of claim 6; and

instructions for use.

16. A corrosion inhibitor article comprising:

a woven or non-woven material forming a wipe saturated with a corrosion inhibitor composition;

wherein said

corrosion inhibitor composition comprises a hypochlorite source comprising sodium hypochlorite, sodium chloride and sodium hydroxide, and about 0.01 to about 2 wt-% corrosion inhibitor comprising a water soluble calcium salt and a member selected from the group consisting of a water soluble zinc salt, a non-thickening polymeric salt having a molecular weight less than about 10,000, and a sugar acid;

wherein the pH of said composition is at least about 7, the ratio of said hypochlorite source to corrosion inhibitor is from about 10;

1 to about 600;

1 and the ratio of said zinc salt, polymeric salt or sugar acid to said calcium salt is from about 6;

1 to about 1;

6, and wherein the composition does not cause corrosion and/or discoloration on a treated metal surface.

17. The article according to claim 16, wherein said corrosion inhibitor composition has a pH of at least 9.

18. The article according to claim 16, wherein the ratio of said zinc salt, polymeric salt or sugar acid to said calcium salt is from about 4:

1 to about 1;

4.

19. The article according to claim 16, wherein the ratio of said hypochlorite source to corrosion in is from about 50:

1 to about 200;

1.

20. The article according to claim 16, wherein said corrosion inhibitor is an EPA approved inert material for antimicrobial formulations and does not adversely impact the stability of the hypochlorite source.

21. The article according to claim 16, wherein said corrosion inhibitor is a water soluble zinc salt and a water soluble calcium salt, wherein said salts have a chloride or non-halide anion.

23. A kit comprising:

a container containing a woven or non-woven material forming a wipe saturated with a liquid corrosion inhibitor composition;

wherein said

corrosion inhibitor composition comprises a hypochlorite source and a corrosion inhibitor comprising a water soluble calcium compound and a member selected from the group consisting of a zinc compound, a polyacrylate compound, and a sugar acid, wherein the pH of said composition is at least about 7 and wherein the composition does not cause corrosion and/or discoloration on a treated metal surface; and

instructions for use to combine and use the wipes with the corrosion inhibitor composition.