Galvanized metal corrosion inhibitor compositions and methods of use

Patent metadata

Field	Value
Publication number	US-12084594-B2
Application number	US-202117186631-A
Country	US
Kind code	B2
Filing date	Feb 26, 2021
Priority date	Mar 27, 2020
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

A method of preventing formation of rust on a metal surface is provided. The method may include applying a polyamine onto the metal surface and applying a compound of formula (I) or salt thereof onto the metal surface. The compositions and methods disclosed herein may be used to inhibit corrosion of a metal surface in contact with an aqueous system.

First claim

What is claimed is:

1. A method of preventing formation of rust on a metal surface, comprising:
applying a compound of formula (I) onto the metal surface,

and
applying a polyamine onto the metal surface, wherein the polyamine comprises poly[oxy(methyl)-1,2-ethandilyl], alpha-(2-aminomethylethyl)-omega-(2-aminomethyl-ethoxy)-) functionalized with 1,2-propanediol, 3-chloro,
wherein X is independently hydrogen, halogen, or a substituted or unsubstituted C 1-5 alkyl group;
m is 1, 2, 3, or 4;
R 1 is hydrogen, a substituted or unsubstituted C 1 -C 12 alkyl group, or a substituted or unsubstituted C 4 -C 6 aryl group;
R 2 is absent, hydrogen, a substituted or unsubstituted C 1 -C 12 alkyl group, or a substituted or unsubstituted C 4 -C 6 aryl group;
R 3 is a bond or CHR 4 ;
R 4 is hydrogen, halogen, NR 5 R 6 , or OR 5 ; wherein R 5 and R 6 are each independently hydrogen, a substituted or unsubstituted C 1 -C 12 alkyl group, or a substituted or unsubstituted C 4 -C 6 aryl group; and
Z is independently nitrogen, CX, or N + R 5 .

2. The method of claim 1 , wherein
X is independently hydrogen or halogen;
R 1 is hydrogen;
R 2 is absent; and
R 3 is CHR 4 .

3. The method of claim 1 , wherein the compound of formula (I) is

4. The method of claim 1 , wherein the metal surface is a galvanized metal surface that is part of an industrial water system.

5. The method of claim 1 , wherein the compound of formula (I) and the polyamine are applied onto the metal surface by spraying directly onto the metal surface.

6. The method of claim 1 , wherein the compound of formula (I) and the polyamine are applied onto the metal surface by dipping the metal surface into a solution containing the compound of formula (I) and the polyamine.

7. The method of claim 1 , further comprising applying one or more compounds selected from the group consisting of: other corrosion inhibitors, scale inhibitors, fluorescent tracers, water treatment polymers, and combinations thereof.

8. The method of claim 1 , further comprising applying one or more other corrosion inhibitors selected from the group consisting of: phosphates; phosphonates; phosphinates; silicates; molybdate; tungstate; borate; zinc and its salts; vanadate; chromate; polycarboxylates; and combinations thereof.

9. The method of claim 1 , wherein the rust is white rust.

10. The method of claim 1 , further comprising mixing the compound of formula (I) and the polyamine before applying to the metal surface.

Assignees

• Ecolab Usa Inc

Inventors

• Hatch Steven R
• Seetharaman Jothibasu
• Dhawan Ashish
• Silvernail Carter M
• Banerjee Santanu
• Cheruku Pradeep

Classifications

• C09D179/02

  Polyamines · CPC title

• C08K5/3447

  condensed with carbocyclic rings · CPC title

• C07D235/06

  with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached in position 2 · CPC title

• C02F5/125

  combined with inorganic substances · CPC title

• C07D401/04

  directly linked by a ring-member-to-ring-member bond · CPC title