Corrosion control compositions and methods of mitigating corrosion

• US 9,175,405 B2
• Filed: 03/15/2013
• Issued: 11/03/2015
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Original Assignee: Ecolab USA Incorporated (Ecolab, Inc.)
• Inventors: Gill, Jasbir S., Zim, Danilo, Paschoalino, Matheus
• Primary Examiner(s): FLETCHER III, WILLIAM P
• Application Number:
  US13/839,721
• Publication Number:
  US 20140272133A1
• Time in Patent Office: 963 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: B05D 7/22 to internal surfaces, e.g. of tubes
• CPC Class Codes: C09D 5/08 Anti-corrosive paints
• CPC Class Codes: C23F 11/04 in markedly acid liquids
• CPC Class Codes: C23F 11/08 in other liquids
• CPC Class Codes: C23F 11/1676 Phosphonic acids
• CPC Class Codes: C23F 11/188 containing phosphates

Abstract

Corrosion inhibitor compositions are provided that can include a mixture of one or more transition metals, one or more organic phosphates, one or more inorganic phosphates, optionally a dispersant, and hydroxyphosphono acetic acid and/or salts thereof. Methods of mitigating or inhibiting corrosion of housing or conduits containing aqueous mediums are also disclosed. The methods can include the steps of pretreating the metal conduit with a mixture of one or more transition metals, one or more organic phosphates, one or more inorganic phosphates, and hydroxyphosphono acetic acid, introducing an aqueous medium into the metal conduit, and injecting a mixture of one or more transition metals, one or more organic phosphates, one or more inorganic phosphates, and hydroxyphosphono acetic acid and/or salts thereof into the aqueous medium.

Claims

1. A method of mitigating corrosion of a conduit containing an aqueous medium comprising:

(a) providing a metal conduit;

(b) introducing an aqueous medium into said metal conduit;

(c) injecting a mixture comprising an effective amount of one or more transition metals, one or more organic phosphates, and one or more inorganic phosphates into said aqueous medium;

(d) injecting an effective amount of hydroxyphosphono acetic acid and/or salts thereof into said aqueous medium,

(e) treating said metal conduit with an effective amount of a mixture comprising one or more transition metals, one or more organic phosphates, and one or more inorganic phosphates before step (b); and

(f) treating said metal conduit with an effective amount of hydroxyphosphono acetic acid and/or salts thereof before step (b).

2. The method of claim 1, wherein said effective amount in step (e) is about 100 ppm and said effective amount in step (f) is about 50 ppm.

3. The method of claim 1, further comprising the step of adjusting a pH of the aqueous medium to about 8.5 by adding lime or soda ash.

4. The method of claim 1, wherein said effective amount in step (c) is from about 5 ppm to about 20 ppm and said effective amount in step (d) is from about 2.5 ppm to 10 ppm.

5. The method of claim 1, wherein said aqueous medium is sea water.

6. The method of claim 1, wherein said one or more transition metals comprises zinc.

7. A method of mitigating corrosion of a conduit containing an aqueous medium comprising:

(a) providing a metal conduit;

(b) introducing an aqueous medium into said metal conduit;

(c) injecting a mixture comprising an effective amount of one or more transition metals, one or more organic phosphates, and one or more inorganic phosphates into said aqueous medium; and

(d) injecting an effective amount of hydroxyphosphono acetic acid and/or salts thereof into said aqueous medium, wherein said aqueous medium is sea water.

8. A method of mitigating corrosion of a conduit containing an aqueous medium comprising:

(a) providing a metal conduit;

(b) introducing an aqueous medium into said metal conduit;

(c) injecting a mixture comprising an effective amount of one or more transition metals, one or more organic phosphates, and one or more inorganic phosphates into said aqueous medium, wherein said one or more transition metals comprises zinc; and

(d) injecting an effective amount of hydroxyphosphono acetic acid and/or salts thereof into said aqueous medium.