Ambient curable corrosion resistant sol-gel coating and composition and process for making the same

Patent metadata

Field	Value
Publication number	US-9359507-B2
Application number	US-201313832833-A
Country	US
Kind code	B2
Filing date	Mar 15, 2013
Priority date	Mar 15, 2013
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

A coating composition and a method for coating metallic substrates for corrosion resistance. In at least one embodiment, the coating composition comprises acid, metal acetate, epoxy silane, aminosilane and water.

First claim

What is claimed is:

1. An aqueous organo sol-gel composition for coating a metallic component, the composition comprising:
acid;
metal acetate comprising zirconium acetate, magnesium acetate, or a combination thereof;
an epoxy silane;
an aminosilane; and
water;

wherein the epoxy silane and the aminosilane are provided in a weight ratio of 4:1 to 8:1.

2. The composition of claim 1 further comprising an optional surfactant, wherein the components are present in the following weight percents based on weight percent solids:

Components
Weight Percent

acid
1.75 to 8  

metal acetate
1.5 to 8  

epoxy silane
 8 to 40

aminosilane
 2 to 10

water
35 to 90

surfactant
 0 to 1.

3. The composition of claim 2 , wherein the components are present in the following weight percents based on weight percent solids:

Components
Weight Percent

acid
2 to 4

metal acetate
1.75 to 4  

epoxy silane
 8 to 20

aminosilane
2 to 5

water
55 to 80

surfactant
0 to 1

solvent
  6 to 12.

4. The composition of claim 1 , wherein the acid comprises glacial acetic acid.

5. The composition of claim 1 , wherein the epoxy silane comprises glycidoxypropyl trimethoxy silane.

6. The composition of claim 1 , wherein the aminosilane comprises N-2-aminoethyl-3-aminopropyltrimethoxysilane.

7. The composition of claim 1 , wherein the pH of the composition is between 2.5 and 5.

8. The coating composition of claim 1 , wherein the coating composition is sprayable against a metal substrate to form a coating 0.6 to 2.5 microns thick on the substrate.

9. A method for improving corrosion resistance of a metallic substrate, the method comprising:
providing the aqueous organo sol-gel

of claim 1 ;
depositing the composition on an aluminum alloy substrate; and
allowing the composition to dry to form a sol-gel coating on the substrate.

10. The method of claim 9 , wherein the substrate comprises aluminum and copper and has a metallic oxide coating thereon, the sol-gel coating being disposed on the metallic oxide coating in a thickness of 0.6 to 2.5 microns to form a seal over the oxide coating, and the step of depositing the composition comprises spraying the composition over the oxide coating.

11. The method of claim 10 , wherein the composition comprises:

Components
Weight Percent

acid
2 to 4

metal acetate
1.75 to 4  

epoxy silane
 8 to 20

aminosilane
2 to 5

water
65 to 88

surfactant
  0.1 to 0.25.

12. The method of claim 10 , wherein the composition comprises:

Components
Weight Percent

acid
2 to 4

metal acetate
1.75 to 4  

epoxy silane
 8 to 20

aminosilane
2 to 5

water
55 to 88

surfactant
0 to 1

solvent
  6 to 12.

13. The method of claim 10 wherein the metal oxide coating is selected from the group consisting of zirconium oxide, titanium oxide and combinations thereof.

14. The method of claim 10 , wherein the metal oxide coating comprises titanium oxide.

15. The method of claim 9 , wherein the substrate has a metallic oxide coating thereon, the sol-gel coating being disposed on the metallic oxide coating in a thickness of 0.6 to 2.5 microns to form a seal over the oxide coating, and the step of depositing the composition comprises spraying the composition over the oxide coating.

16. The composition of claim 1 , wherein the aq

Assignees

• Henkel Ag & Co Kgaa

Inventors

• Kramer Kirk
• Salet Lisa

Classifications

• C23C2222/20

  Use of solutions containing silanes · CPC title

• C23C18/1245

  Inorganic substrates other than metallic · CPC title

• C23C22/83

  Chemical after-treatment · CPC title

• C09D7/40

  Additives · CPC title

• C09D5/086

  Organic or non-macromolecular compounds · CPC title