Corrosion control compositions and methods of mitigating corrosion

Patent metadata

Field	Value
Publication number	US-10443133-B2
Application number	US-201514868584-A
Country	US
Kind code	B2
Filing date	Sep 29, 2015
Priority date	Mar 15, 2013
Publication date	Oct 15, 2019
Grant date	Oct 15, 2019

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.

First claim

What is claimed is:

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.

Assignees

• Ecolab Usa Inc

Inventors

• Gill Jasbir
• Zim Danilo
• Paschoalino Matheus

Classifications

• C23F11/08

  in other liquids · CPC title

• B05D7/22

  to internal surfaces, e.g. of tubes · CPC title

• C09D5/08

  Anti-corrosive paints · CPC title

• C23F11/04 Primary

  in markedly acid liquids · CPC title

• C23F11/188

  containing phosphates · CPC title