Metal Complexing Agents as Corrosion Inhibitors

Patent metadata

Field	Value
Publication number	US-2016272818-A1
Application number	US-201414777684-A
Country	US
Kind code	A1
Filing date	Mar 13, 2014
Priority date	Mar 16, 2013
Publication date	Sep 22, 2016
Grant date	—

Abstract

A composition for application to a metal substrate comprises a metal cation, a metal complexing agent and an aqueous carrier. A substrate or article includes the composition for application to a metal substrate and a coating on the composition. A method of fabricating a substrate comprises applying the composition to a substrate, allowing the composition to dry to form a conversion coating, and applying a coating on the conversion coating.

First claim

What is claimed is:

1 . A composition for application to a metal substrate, the composition comprising:
a metal complexing agent; a metal cation; and an aqueous carrier.

2 . The composition according to claim 1 , wherein the metal cation comprises a rare earth element cation, an alkali metal cation, an alkali earth metal cation, and/or a transition metal cation.

3 . The composition according to claim 1 , wherein the composition further comprises an anion capable of forming a salt with the metal cation.

4 . The composition according to claim 3 , wherein the anion comprises a carbonate ion, a silicate ion, a nitrate ion, a halide ion, a phosphate ion, a sulfate ion, and/or a hydroxide ion.

5 . The composition according to claim 1 , wherein the metal cation comprises Ce, Y, Pr, Nd, Li, Na, K, Cr, Mg, Zr and/or Zn.

6 . The composition according to claim 1 , wherein the metal complexing agent comprises a compound capable of binding and/or removing copper and/or iron from a metal surface.

7 . The composition according to claim 1 , wherein the metal complexing agent comprises an azole, an amine, an organosulfur compound, a protein, a polysaccharide, a polynucleic acid, an amino acid, an organic polyacid, an organic acid and/or a polypeptide.

8 . The composition according to claim 1 , wherein the metal complexing agent comprises ethylenediamine tetraacetic acid (EDTA), methyl amine, a urea, a thiourea, an organosulfur compound represented by (R 1 R 2 N)(R 3 R 4 N)C═S where R 1 , R 2 , R 3 and R 4 each independently comprise a hydrocarbon substituent, a thioamide represented by RC(S)NR 2 where R comprises a hydrocarbon substituent, glutamic acid, histidine, malate, glycinate, citrate, ascorbic acid, and/or a phytochelatin.

9 . An article, comprising:
a substrate; and the composition of claim 1 on at least a portion of the substrate.

10 . The article of claim 9 , wherein the substrate comprises aluminum.

11 . The article of claim 9 , further comprising a coating on at least a portion of the composition.

12 . The article of claim 11 , wherein the coating comprises a primer coat and/or a topcoat.

13 . A method of manufacturing a coated article, the method comprising:
applying the composition of claim 1 to at least a portion of a substrate; and allowing the composition to dry to form a conversion coating.

14 . The method of claim 13 , further comprising pre-treating the substrate prior to application of the composition.

15 . The method of claim 13 , further comprising applying a coating on at least a portion of the conversion coating.

16 . The method of claim 15 , wherein the coating comprises a primer coat and/or a topcoat.

17 . The method of claim 13 , further comprising allowing the composition to dry.

Assignees

• Prc Desoto Int Inc

Inventors

• Morris Eric L

Classifications

• C23C26/00

  Coating not provided for in groups C23C2/00 - C23C24/00 · CPC title

• C09D5/08 Primary

  Anti-corrosive paints · CPC title

• C23C22/78

  Pretreatment of the material to be coated · CPC title

• C23C28/00

  Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D · CPC title

• C23F11/185

  Refractory metal-containing compounds · CPC title