Corrosion inhibiting additive

Patent metadata

Field	Value
Publication number	US-11091840-B2
Application number	US-201816036168-A
Country	US
Kind code	B2
Filing date	Jul 16, 2018
Priority date	Jun 6, 2016
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

A corrosion resistant article including an aluminum substrate and a corrosion-inhibiting cerium based corrosion inhibitor corrosion inhibiting additive on the aluminum substrate, the corrosion inhibiting additive comprising an anodic corrosion inhibitor and a cathodic corrosion inhibitor, the anodic corrosion inhibitor greater than 25 wt % of the total inhibitor.

First claim

What is claimed is:

1. An article comprising:
a metal substrate; and
a cerium based corrosion inhibiting additive on the metal substrate, the corrosion inhibiting additive comprising an anodic corrosion inhibitor and a cathodic corrosion inhibitor, the anodic corrosion inhibitor greater than about 25 wt % of the total inhibitor, wherein the anodic corrosion inhibitor is at least 25 wt % ZnMoO 4 .

2. The corrosion resistant article as recited in claim 1 , wherein the anodic corrosion inhibitor is at least 50 wt% ZnMoO 4 .

3. The corrosion resistant article as recited in claim 1 , wherein the anodic corrosion inhibitor is at least 75 wt % ZnMoO 4 .

4. The corrosion resistant article as recited in claim 1 , wherein the anodic corrosion inhibitor is at least 99 wt % ZnMoO 4 .

5. The corrosion resistant article as recited in claim 1 , wherein the cathodic corrosion inhibitor includes a Ce-Citrate.

6. A method of selecting a corrosion-inhibiting substance, comprising:
selecting a cerium-based corrosion-inhibiting composition based upon a solubility range, the corrosion inhibiting additive comprising an anodic corrosion inhibitor and a cathodic corrosion inhibitor, the anodic corrosion inhibitor greater than about 25 wt % of the total inhibitor, wherein the corrosion-inhibiting cerium based corrosion inhibitor substance includes an anodic corrosion inhibitor containing at least 25 wt % ZnMoO 4 .

7. The method as recited in claim 6 , wherein the solubility range is 0.01 mM to 20 mM.

8. The method as recited in claim 6 , wherein the corrosion-inhibiting Cerium based corrosion inhibitor substance includes a cathodic corrosion inhibitor with a Ce-Citrate.

9. A method of selecting a corrosion-inhibiting substance, comprising:
selecting a cerium-based corrosion-inhibiting composition based upon a solubility range, the corrosion inhibiting additive comprising an anodic corrosion inhibitor and a cathodic corrosion inhibitor, the anodic corrosion inhibitor greater than about 25 wt % of the total inhibitor, wherein the corrosion-inhibiting cerium based corrosion inhibitor substance includes a cathodic corrosion inhibitor with a Ce-Tartrate, or a Ce-Acetate.

10. The method as recited in claim 6 , wherein the corrosion-inhibiting Cerium based corrosion inhibitor substance includes active sodium ions concentration lower than 1 % in the corrosion inhibitor dry powder.

11. The method as recited in claim 6 , wherein the corrosion-inhibiting Cerium based corrosion inhibitor substance includes anodic and cathodic corrosion inhibitors synthesized separately as powders of a similar particle size range so that the powders can be mixed homogeneously.

12. A corrosion-inhibiting composition comprising:
a carrier fluid;
a cathodic corrosion inhibitor in the carrier fluid; and
an anodic corrosion inhibitor in the carrier fluid, the anodic corrosion inhibitor greater than about 25 wt % of the total inhibitor.

13. The composition as recited in claim 12 , wherein the carrier fluid comprises at least one of water, alcohol, organic or inorganic solvent or dispersing fluid, primer, paint, adhesive, a coolant, or sealant.

Assignees

• Raytheon Tech Corp

Inventors

• Ding Zhongfen (Vivian)
• Zafiris Georgios S
• Zhang Weilong
• Kryzman Michael A
• Fotache Catalin G
• Jaworowski Mark R

Classifications

• C09D5/084 Primary

  Inorganic compounds · CPC title

• C23F13/06

  Constructional parts, or assemblies of cathodic-protection apparatus · CPC title

• C08K3/11

  Compounds containing metals of Groups 4 to 10 or of Groups 14 to 16 of the Periodic Table · CPC title

• C23F13/005

  Anodic protection · CPC title

• C08K2003/2296

  of zinc · CPC title