# US 2019/0169757 A1 · Cerium citrate, method of making and corrosion inhibitor comprising cerium citrate

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- Number: US 2019/0169757 A1
- Document ID: US20190169757A1
- Status: Published application
- Kind: A1
- Application number: 16/197,955
- Filed: 2018-11-21
- Published: 2019-06-06
- Earliest claimed: 2016-06-06
- Assignees: United Technologies Corporation
- Applicants: United Technologies Corporation
- Inventors: Zhongfen Ding; Georgios S. Zafiris; Bart Antonie van Hassel; Catalin G. Fotache
- Web page: https://patentgrep.com/patent/US20190169757A1

## CPC

- C07C 51/412: {by conversion of the acids, their salts, esters or anhydrides with the same carboxylic acid part}
- C07C 59/265: Citric acid
- C09D 5/00: Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes
- C09D 5/084: {Inorganic compounds}
- C09D 7/61: inorganic
- C23F 11/10: using organic inhibitors
- C23F 11/18: using inorganic inhibitors
- C23F 11/187: {Mixtures of inorganic inhibitors}
- C23F 13/005: {Anodic protection}
- C23F 13/06: Constructional parts, or assemblies of cathodic-protection apparatus
- C23F 13/14: Material for sacrificial anodes
- C08K 3/10: Metal compounds
- C08K 3/24: Acids; Salts thereof {(C08K3/16 takes precedence)}
- C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS
- 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)
- 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
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

A method of making cerium citrate includes combining cerium carbonate and citric acid to produce cerium citrate and carbon dioxide. The cerium citrate is substantially free of negative ions other than citrate. The cerium citrate can be used in a corrosion inhibitor composition.

## Claims

### Claim at position 1

1-9. (canceled)

### Claim 10

A cerium citrate produced by combining cerium carbonate and citric acid to produce cerium citrate and carbon dioxide, wherein the cerium citrate is substantially free of negative ions other than citrate.

### Claim 11 (depends on 10)

The cerium citrate of claim 10, wherein the cerium citrate is hydrated.

### Claim 12 (depends on 10)

The cerium citrate of claim 10, wherein the cerium citrate has greater than or equal to 10 weight percent water of hydration.

### Claim 13 (depends on 10)

The cerium citrate of claim 10, wherein the cerium citrate is a trivalent cerium citrate.

### Claim 14

A corrosion inhibitor composition comprising a cerium citrate substantially free of negative ions other than citrate.

### Claim 15 (depends on 14)

The corrosion inhibitor composition of claim 14, wherein the cerium citrate is a hydrate.

### Claim 16 (depends on 14)

The corrosion inhibitor composition of claim 14, wherein the cerium citrate has greater than or equal to 10 weight percent water of hydration.

### Claim 17 (depends on 14)

The corrosion inhibitor composition of claim 14, wherein the cerium citrate is a trivalent cerium citrate.

### Claim 18 (depends on 14)

The corrosion inhibitor composition of claim 14 further comprising zinc molybdate.

### Claim 19 (depends on 14)

The corrosion inhibitor composition of claim 14 in combination with at least one of an adhesive, primer, paint, lubricant, cooling fluid, sealant and epoxy.

### Claim 20

An article comprising:
a metal substrate; and
a corrosion inhibitor disposed on the substrate, wherein the corrosion inhibitor comprises a cerium citrate substantially free of negative ions other than citrate.