# US 9,518,328 B1 · Corrosion inhibiting gel

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- Number: US 9,518,328 B1
- Document ID: US9518328B1
- Status: Granted
- Kind: B1
- Application number: 14/986,756
- Filed: 2016-01-04
- Granted: 2016-12-13
- Earliest claimed: 2011-03-04
- Assignees: Cortec Corporation
- Applicants: Cortec Corporation
- Inventors: Tim Whited; Margarita Kharshan; Kristy Gillette; Boris Miksic
- Web page: https://patentgrep.com/patent/US9518328B1

## CPC

- C23F 11/143: {Salts of amines}
- C09D 4/00: Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16}
- C23F 11/02: in air or gases by adding vapour phase inhibitors
- C23F 11/10: using organic inhibitors
- C23F 11/141: {Amines; Quaternary ammonium compounds}
- C23F 11/142: {Hydroxy amines}
- C23F: NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE (working metal by laser beams B23K26/00; desurfacing by applying flames B23K7/00; working of metal by electro-erosion B23H; producing decorative effects by removing surface material, e.g. by engraving, by etching, B44C1/22; electrolytic etching or polishing C25F); INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)

## Abstract

A gel-forming corrosion inhibiting composition may be employed to protect a metal article from corrosion. The gel-forming corrosion inhibitor composition is combined with water and delivered to an enclosed space at least partially defined by the metal article. Subsequent to delivery, the combination forms a gel to sustainably fill the enclosed space, thereby protecting the metal article from corrosion.

## Claims

### Claim 1

A method for inhibiting corrosion of a metal article defining an enclosure, said method comprising:
(a) providing a first mixture having:
(i) 0.1-20% by weight of a corrosion inhibitor selected from the group consisting of amine and ammonium salts of organic acids, ammonium salts of tribasic acids, amine salts of inorganic acids, alkali and amine dibasic acid salts, tall oil imidazolines, and combinations thereof;
(ii) 1-50% by weight of a water-soluble gel-forming agent including a super-absorbent polymer;
(iii) a cross-linking agent reactable with hydrophilic groups of said gel-forming agent, wherein said cross-linking agent includes at least one of a zirconium ion donor and a titanium ion donor; and
(iv) water;
(b) providing a second mixture having a hydrophilic polymer viscosity modifier that is different from said water-soluble gel-forming agent;
(c) combining said first and second mixtures into a combination having a gelation time that initiates upon combining said first and second mixtures into said combination; and
(d) delivering said combination to the enclosure within a delivery time that is less than said gelation time.

### Claim 2 (depends on 1)

A method as in claim 1 wherein said combination initially exhibits a pre-gel viscosity.

### Claim 3 (depends on 2)

A method as in claim 2 wherein said gelation time is between 30 and 300 minutes.

### Claim 4 (depends on 3)

A method as in claim 3 wherein, upon expiration of said gelation time, said combination attains a gel condition with a gel viscosity that is at least one order of magnitude greater than said pre-gel viscosity.

### Claim 5 (depends on 4)

A method as in claim 4 wherein said gel viscosity is at least 10,000 cP at 20° C.

### Claim 6 (depends on 5)

A method as in claim 5 wherein said pre-gel viscosity is between 0.5-2,000 cP at 20° C.

### Claim 7 (depends on 1)

A method as in claim 1 wherein said corrosion inhibitor is present at about 2-3% by weight of said combination.

### Claim 8 (depends on 1)

A method as in claim 1 wherein said hydrophilic polymer viscosity modifier is present in said combination at a weight ratio of about 3:1 of said viscosity modifier to said gel-forming agent.

### Claim 9 (depends on 1)

A method as in claim 1 wherein the enclosure is between the metal article and another metal article.

### Claim 10 (depends on 9)

A method as in claim 9 wherein the enclosure is between coaxial metal tubes.

### Claim 11 (depends on 9)

A method as in claim 9 wherein said combination exhibits an electrical resistivity of less than 104 Ω·m.

### Claim 12 (depends on 11)

A method as in claim 11 wherein said combination facilitates cathodic corrosion protection to said metal articles.

### Claim 13 (depends on 1)

A method as in claim 1, including removing the gelled combination from the enclosure by applying water to the gelled combination.

### Claim 14 (depends on 13)

A method as in claim 13 wherein the removal water is at a temperature of at least 100° F.

### Claim 15 (depends on 1)

A method as in claim 1, including combining said first and second mixtures immediately prior to delivering said combination to the enclosure.