Corrosion control compositions and methods of mitigating corrosion

• US 10,443,133 B2
• Filed: 09/29/2015
• Issued: 10/15/2019
• 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, Zim, Danilo, Paschoalino, Matheus
• Primary Examiner(s): Heincer, Liam J
• Assistant Examiner(s): Oyer, Andrew J.
• Application Number:
  US14/868,584
• Publication Number:
  US 20160017500A1
• Time in Patent Office: 1,477 Days
• 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 corrosion inhibitor composition comprising:

a mixture comprising zinc, phosphinosuccinic oligomer (PSO), and orthophosphate; and

hydroxyphosphono acetic acid and/or salts thereof.

2. The corrosion inhibitor composition of claim 1, wherein said mixture is present in an amount ranging from about 2 ppm to about 500 ppm.

3. The corrosion inhibitor composition of claim 1, wherein said mixture is present in an amount ranging from about 2.5 ppm to about 5 ppm.

4. The corrosion inhibitor composition of claim 1, wherein said hydroxyphosphono acetic acid and/or salts thereof is present in an amount ranging from about 1 ppm to about 50 ppm.

5. The corrosion inhibitor composition of claim 1, wherein said hydroxyphosphono acetic acid and/or salts thereof is present in an amount ranging from about 1.25 ppm to about 5 ppm.

6. The corrosion inhibitor composition of claim 1, further comprising a dispersant, wherein the dispersant is a terpolymer of acrylic acid, acrylamide, and sulfonated acrylamide, wherein said dispersant is present in an amount ranging from about 1 ppm to about 50 ppm.

7. The corrosion inhibitor composition of claim 6, wherein said dispersant is present in an amount of about 5 ppm to about 15 ppm.

8. The corrosion inhibitor composition of claim 6, wherein the terpolymer comprises acrylic acid/acrylamide/sulfonated acrylamide in a monomer ratio of about 40/about 20/about 40.

9. A corrosion inhibitor composition consisting of:

a mixture consisting of zinc, phosphinosuccinic oligomer (PSO), and orthophosphate; and

hydroxyphosphono acetic acid and/or salts thereof.

10. A corrosion inhibitor composition consisting of:

zinc;

phosphinosuccinic oligomer (PSO);

orthophosphate;

hydroxyphosphono acetic acid and/or salts thereof; and

a dispersant, the dispersant being a terpolymer of acrylic acid, acrylamide, and sulfonated acrylamide.