COMPOSITIONS INCLUDING MAGNESIUM ION, CALCIUM ION, AND SILICATE OR CARBONATE AND METHODS EMPLOYING THEM TO REDUCE CORROSION AND ETCH

• US 20080300160A1
• Filed: 05/02/2008
• Published: 12/04/2008
• Est. Priority Date: 05/04/2007
• Status: Active Grant

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Inventors: Smith, Kim R., Besse, Michael E., Bartelme, Michael, Lawrence, Michel M.
• Granted Patent: US 7,960,329 B2
• Time in Patent Office: Days
• US Class Current: 510/220
• CPC Class Codes: C02F 2303/14 Maintenance of water treatment installations
• CPC Class Codes: C02F 2303/22 Eliminating or preventing deposits, scale removal, scale prevention C02F1/042, C02F1/4602, C02F5/00 take precedence
• CPC Class Codes: C02F 5/02 Softening water by precipitation of the hardness
• CPC Class Codes: C02F 5/06 using calcium compounds
• CPC Class Codes: C11D 2111/14 Hard surfaces
• CPC Class Codes: C11D 3/044 Hydroxides or bases
• CPC Class Codes: C11D 3/046 Salts
• CPC Class Codes: C11D 3/10 Carbonates ; Bicarbonates
• CPC Class Codes: C11D 7/10 Salts
• CPC Class Codes: C23F 11/08 in other liquids
• CPC Class Codes: C23F 11/124 Carboxylic acids
• CPC Class Codes: C23F 11/18 using inorganic inhibitors
• CPC Class Codes: C23G 1/20 Other heavy metals
• CPC Class Codes: C23G 1/22 Light metals

Abstract

The present invention relates to compositions including a water soluble magnesium salt, water soluble calcium salt, and silicate or carbonate, which have a beneficial effect on corrosion during cleaning. The present compositions can reduce corrosion of glass or aluminum. The present invention also relates to methods employing these compositions.

Claims

1. A corrosion inhibiting composition comprising:

about 1 to about 75 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 1 to about 85 wt-% alkali metal silicate;

wherein the weight ratio of water soluble magnesium salt to the sum of the amount of water soluble calcium salt plus water soluble silicate compound is about 0.5;

1 or less; and

the weight ratio of water soluble calcium salt to water soluble silicate compound salt is about 1-2;

2-1.

2. The composition of claim 1, comprising less than about 0.5 wt-% zinc-containing compounds.

3. The composition of claim 1, comprising less than about 0.5 wt-% aluminum-containing compounds.

4. The composition of claim 1, comprising less than about 0.5 wt-% phosphorous-containing compounds.

5. A corrosion inhibiting composition comprising:

about 1 to about 95 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 5 to about 90 wt-% alkali metal silicate;

wherein the weight ratio of water soluble calcium salt to the sum of the amount of water soluble magnesium salt plus water soluble silicate compound is about 0.65;

1 or less; and

the weight ratio of water soluble calcium salt to water soluble magnesium salt is about 7-13;

5-15.

6. The composition of claim 5, wherein the weight ratio of water soluble calcium salt to water soluble magnesium salt is about 7-8:

12-15

7. The composition of claim 5, wherein the weight ratio of water soluble calcium salt to water soluble magnesium salt is about 1:

2

8. The composition of claim 5, comprising less than about 0.5 wt-% zinc-containing compounds.

9. The composition of claim 5, comprising less than about 0.5 wt-% aluminum-containing compounds.

10. The composition of claim 5, comprising less than about 0.5 wt-% phosphorous-containing compounds.

11. A corrosion inhibiting composition comprising:

about 1 to about 95 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 5 to about 90 wt-% alkali metal carbonate;

wherein the weight ratio of magnesium ions to calcium ions is about 2;

3 to 4;

1.

12. The composition of claim 11, wherein the weight ratio of magnesium ions to calcium ions is about 3:

1.

13. The composition of claim 11, comprising less than about 0.5 wt-% zinc-containing compounds.

14. The composition of claim 11, comprising less than about 0.5 wt-% aluminum-containing compounds.

15. The composition of claim 11, comprising less than about 0.5 wt-% phosphorous-containing compounds.

16. A detergent for warewashing or automatic dishwashing, the detergent comprising source of alkalinity and about 0.01 to about 20 wt-% corrosion inhibitor;

the corrosion inhibitor comprising;

about 1 to about 75 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 1 to about 85 wt-% alkali metal silicate;

wherein the weight ratio of water soluble magnesium salt to the sum of the amount of water soluble calcium salt plus water soluble silicate compound is about 0.5;

1 or less; and

the weight ratio of water soluble calcium salt to water soluble silicate compound salt is about 1-2;

2-1;

or

the corrosion inhibitor comprising;

about 1 to about 95 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 5 to about 90 wt-% alkali metal silicate;

wherein the weight ratio of water soluble calcium salt to the sum of the amount of water soluble magnesium salt plus water soluble silicate compound is about 0.65;

1 or less; and

the weight ratio of water soluble calcium salt to water soluble magnesium salt is about 7-13;

5-15;

or

the corrosion inhibitor comprising;

about 1 to about 95 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 5 to about 90 wt-% alkali metal carbonate;

wherein the weight ratio of magnesium ions to calcium ions is about 2;

3 to 4;

1.

17. The detergent of claim 16, comprising about 0.1 to about 10 wt-% corrosion inhibitor.

18. The detergent of claim 16, further comprising a surfactant.

36. The composition of claim 16, wherein the alkaline source is selected from the group consisting of alkali metal carbonate, alkali metal hydroxide, and mixture thereof.

37. The composition of claim 16, wherein the alkaline source is selected from the group consisting of sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, sodium sesquicarbonate, potassium sesquicarbonate, and mixture thereof.

38. The composition of claim 16, wherein the alkaline source is selected from the group consisting of sodium hydroxide, potassium hydroxide, and mixture thereof.

19. A hard surface cleaner comprising surfactant and about 0.01 to about 20 wt-% corrosion inhibitor;

the corrosion inhibitor comprising;

about 1 to about 75 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 1 to about 85 wt-% alkali metal silicate;

wherein the weight ratio of water soluble magnesium salt to the sum of the amount of water soluble calcium salt plus water soluble silicate compound is about 0.5;

1 or less; and

the weight ratio of water soluble calcium salt to water soluble silicate compound salt is about 1-2;

2-1;

or

the corrosion inhibitor comprising;

about 1 to about 95 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 5 to about 90 wt-% alkali metal silicate;

wherein the weight ratio of water soluble calcium salt to the sum of the amount of water soluble magnesium salt plus water soluble silicate compound is about 0.65;

1 or less; and

the weight ratio of water soluble calcium salt to water soluble magnesium salt is about 7-13;

5-15;

or

the corrosion inhibitor comprising;

about 1 to about 95 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 5 to about 90 wt-% alkali metal carbonate;

wherein the weight ratio of magnesium ions to calcium ions is about 2;

3 to 4;

1.

20. The cleaner of claim 19, comprising about 0.1 to about 10 wt-% corrosion inhibitor.

21. The cleaner of claim 19, further comprising an alkalinity source.

34. The composition of claim 19, comprising about 0.05 wt. % to about 15 wt. % surfactant.

35. The composition of claim 19, wherein the surfactant is selected from the group consisting of anionic surfactant, nonionic surfactant, cationic surfactant, zwitterionic surfactant, and a mixture thereof.

22. A method of inhibiting corrosion during cleaning, the method comprising:

providing a corrosion inhibitor comprising;

about 1 to about 75 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 1 to about 85 wt-% alkali metal silicate;

wherein the weight ratio of water soluble magnesium salt to the sum of the amount of water soluble calcium salt plus water soluble silicate compound is about 0.5;

1 or less; and

the weight ratio of water soluble calcium salt to water soluble silicate compound salt is about 1-2;

2-1;

preparing an aqueous use composition of the corrosion inhibitor;

contacting an object in need of cleaning with the aqueous use composition.

23. A method of washing ware, the method comprising:

providing a detergent for warewashing or automatic dishwashing, the detergent comprising source of alkalinity and about 0.01 to about 20 wt-% corrosion inhibitor;

the corrosion inhibitor comprising;

about 1 to about 75 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 1 to about 85 wt-% alkali metal silicate;

wherein the weight ratio of water soluble magnesium salt to the sum of the amount of water soluble calcium salt plus water soluble silicate compound is about 0.5;

1 or less; and

the weight ratio of water soluble calcium salt to water soluble silicate compound salt is about 1-2;

2-1;

preparing an aqueous use composition of the detergent for warewashing or automatic dishwashing; and

contacting the ware with the aqueous use composition.

24. A method of cleaning a hard surface, the method comprising:

providing a hard surface cleaner comprising surfactant and about 0.01 to about 20 wt-% corrosion inhibitor;

the corrosion inhibitor comprising;

about 1 to about 75 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 1 to about 85 wt-% alkali metal silicate;

wherein the weight ratio of water soluble magnesium salt to the sum of the amount of water soluble calcium salt plus water soluble silicate compound is about 0.5;

1 or less; and

the weight ratio of water soluble calcium salt to water soluble silicate compound salt is about 1-2;

2-1;

preparing an aqueous use composition of the hard surface cleaner; and

contacting the hard surface with the aqueous use composition.

25. A method of corrosion control in a food or beverage processing facility, the method comprising:

providing an alkaline cleaner or a corrosion control composition comprising about 0.01 to about 100 wt-% corrosion inhibitor;

the corrosion inhibitor comprising;

about 1 to about 75 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 1 to about 85 wt-% alkali metal silicate;

wherein the weight ratio of water soluble magnesium salt to the sum of the amount of water soluble calcium salt plus water soluble silicate compound is about 0.5;

1 or less; and

the weight ratio of water soluble calcium salt to water soluble silicate compound salt is about 1-2;

2-1;

preparing an aqueous use composition of the alkaline cleaner;

introducing the aqueous use composition into the process facilities at a temperature in the range of about 4°

C. to 60°

C.;

holding the aqueous use composition in a container or circulating the aqueous use composition throughout the system for a time sufficient to clean; and

draining the aqueous use composition from the container or system.

26. A method of inhibiting corrosion during cleaning, the method comprising:

providing a corrosion inhibitor comprising;

about 1 to about 95 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 5 to about 90 wt-% alkali metal silicate;

wherein the weight ratio of water soluble calcium salt to the sum of the amount of water soluble magnesium salt plus water soluble silicate compound is about 0.65;

1 or less; and

the weight ratio of water soluble calcium salt to water soluble magnesium salt is about 7-13;

5-15;

preparing an aqueous use composition of the corrosion inhibitor;

contacting an object in need of cleaning with the aqueous use composition.

27. A method of washing ware, the method comprising:

providing a detergent for warewashing or automatic dishwashing, the detergent comprising source of alkalinity and about 0.01 to about 20 wt-% corrosion inhibitor;

the corrosion inhibitor comprising;

about 1 to about 95 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 5 to about 90 wt-% alkali metal silicate;

wherein the weight ratio of water soluble calcium salt to the sum of the amount of water soluble magnesium salt plus water soluble silicate compound is about 0.65;

1 or less; and

the weight ratio of water soluble calcium salt to water soluble magnesium salt is about 7-13;

5-15;

preparing an aqueous use composition of the detergent for warewashing or automatic dishwashing; and

contacting the ware with the aqueous use composition.

28. A method of cleaning a hard surface, the method comprising:

providing a hard surface cleaner comprising surfactant and about 0.01 to about 20 wt-% corrosion inhibitor;

the corrosion inhibitor comprising;

about 1 to about 95 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 5 to about 90 wt-% alkali metal silicate;

wherein the weight ratio of water soluble calcium salt to the sum of the amount of water soluble magnesium salt plus water soluble silicate compound is about 0.65;

1 or less; and

the weight ratio of water soluble calcium salt to water soluble magnesium salt is about 7-13;

5-15;

preparing an aqueous use composition of the hard surface cleaner; and

contacting the hard surface with the aqueous use composition.

29. A method of corrosion control in a food or beverage processing facility, the method comprising:

providing an alkaline cleaner or a corrosion control composition comprising about 0.01 to about 100 wt-% corrosion inhibitor;

the corrosion inhibitor comprising;

about 1 to about 95 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 5 to about 90 wt-% alkali metal silicate;

wherein the weight ratio of water soluble calcium salt to the sum of the amount of water soluble magnesium salt plus water soluble silicate compound is about 0.65;

1 or less; and

the weight ratio of water soluble calcium salt to water soluble magnesium salt is about 7-13;

5-15;

preparing an aqueous use composition of the alkaline cleaner;

introducing the aqueous use composition into the process facilities at a temperature in the range of about 4°

C. to 60°

C.;

holding the aqueous use composition in a container or circulating the aqueous use composition throughout the system for a time sufficient to clean; and

draining the aqueous use composition from the container or system.

30. A method of inhibiting corrosion during cleaning, the method comprising:

providing a corrosion inhibitor comprising;

about 1 to about 95 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 5 to about 90 wt-% alkali metal carbonate;

wherein the weight ratio of magnesium ions to calcium ions is about 2;

3 to 4;

1;

preparing an aqueous use composition of the corrosion inhibitor;

contacting an object in need of cleaning with the aqueous use composition.

31. A method of washing ware, the method comprising:

providing a detergent for warewashing or automatic dishwashing, the detergent comprising source of alkalinity and about 0.01 to about 20 wt-% corrosion inhibitor;

the corrosion inhibitor comprising;

about 1 to about 95 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 5 to about 90 wt-% alkali metal carbonate;

wherein the weight ratio of magnesium ions to calcium ions is about 2;

3 to 4;

1;

preparing an aqueous use composition of the detergent for warewashing or automatic dishwashing; and

contacting the ware with the aqueous use composition.

32. A method of cleaning a hard surface, the method comprising:

providing a hard surface cleaner comprising surfactant and about 0.01 to about 20 wt-% corrosion inhibitor;

the corrosion inhibitor comprising;

about 1 to about 95 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 5 to about 90 wt-% alkali metal carbonate;

wherein the weight ratio of magnesium ions to calcium ions is about 2;

3 to 4;

1;

preparing an aqueous use composition of the hard surface cleaner; and

contacting the hard surface with the aqueous use composition.

33. A method of corrosion control in a food or beverage processing facility, the method comprising:

providing an alkaline cleaner or a corrosion control composition comprising about 0.01 to about 100 wt-% corrosion inhibitor;

the corrosion inhibitor comprising;

about 1 to about 95 wt-% water soluble calcium salt and water soluble magnesium salt; and

about 5 to about 90 wt-% alkali metal carbonate;

wherein the weight ratio of magnesium ions to calcium ions is about 2;

3 to 4;

1;

preparing an aqueous use composition of the alkaline cleaner;

introducing the aqueous use composition into the process facilities at a temperature in the range of about 4°

C. to 60°

C.;

holding the aqueous use composition in a container or circulating the aqueous use composition throughout the system for a time sufficient to clean; and

draining the aqueous use composition from the container or system.