Metal pretreatment composition containing zirconium, copper, and metal chelating agents and related coatings on metal substrates

Patent metadata

Field	Value
Publication number	US-9580813-B2
Application number	US-201615015523-A
Country	US
Kind code	B2
Filing date	Feb 4, 2016
Priority date	Dec 7, 2010
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

Disclosed is a zirconium-based metal pretreatment coating composition that includes a metal chelator that chelates copper in the metal pretreatment coating composition and thereby improves adhesion of paints to a metal substrate coated with the pretreatment coating composition and the chelating agent is present in a sufficient amount to ensure that in the deposited pretreatment coating on the metal substrate the average total atomic % of copper to atomic % of zirconium is equal to or less than 1.1. The pretreatment coating composition is useful for treating a variety of metal substrates.

First claim

We claim:

1. An article of manufacture comprising a coated metal substrate which has been coated according to a method comprising steps of:
a) contacting a metal substrate with a pre-rinse comprising a copper chelating agent, and optionally copper, prior to application of a zirconium-based pretreatment coating composition to the metal substrate;
b) applying to the metal substrate a zirconium-based metal pretreatment coating composition comprising dissolved Zr, a source of fluoride, optionally materials comprising one or more of silicon, boron and yttrium and optional added dissolved Cu, thereby forming a pretreatment coating on the metal substrate;
wherein the copper chelating agent is present in the pre-rinse in an amount sufficient to control the amount of copper deposited onto the metal substrate by the zirconium-based pretreatment coating composition such that an average total ratio of atomic % of Cu to atomic % of Zr in the pretreatment coating deposited on the metal substrate is in a range of 0.0001 and 1.1.

2. The article of manufacture according to claim 1 , wherein the average total ratio of atomic % of Cu to atomic % of Zr in the pretreatment coating on the metal substrate is about 0.9 to 0.02.

3. The article of manufacture according to claim 1 , wherein the average total ratio of atomic % of Cu to atomic % of Zr in the pretreatment coating on the metal substrate is about 0.3 to 0.1.

4. The article of manufacture according to claim 1 , wherein atomic % of Cu in said pretreatment coating measured at a series of depths from an outer surface of the pretreatment coating to the metal substrate does not exceed 33 atomic % Cu at any of said depths.

5. The article of manufacture according to claim 1 , wherein the metal substrate comprises cold rolled steel.

6. The article of manufacture according to claim 5 , further comprising at least one paint applied to the pretreatment coating resulting in a painted coated substrate that achieves at least 95% paint remaining when tested according to ASTM 3330M (Revised Oct. 1, 2004).

7. The article of manufacture according to claim 5 , further comprising at least one paint applied to the pretreatment coating resulting in a painted coated substrate that achieves 1.9 mm or less average corrosion creep when tested according to ASTM B117 (Revised Dec. 15, 2007) for 500 hours.

8. An article of manufacture comprising a coated metal substrate comprising: a metal substrate; and deposited on said metal substrate, a pretreatment coating comprising metal from said substrate, zirconium, oxygen, copper, and optional elements fluorine and carbon; wherein the pretreatment coating on the metal substrate has an average total ratio of atomic % of Cu to atomic % of Zr that is equal to or less than 1.1.

9. The article of manufacture according to claim 8 , wherein the average total ratio of atomic % of Cu to atomic % of Zr in the pretreatment coating deposited on the metal substrate that is in a range of 0.0001 and 1.1.

10. The article of manufacture according to claim 8 , wherein the average total ratio of atomic % of Cu to atomic % of Zr in the pretreatment coating on the metal substrate is about 0.9 to 0.02.

11. The article of manufacture according to claim 8 , wherein the average total ratio of atomic % of Cu to atomic % of Zr in the pretreatment coating on the metal substrate is about 0.3 to 0.1.

12. The article of manufacture according to claim 8 , wherein the elements fluorine and carbon are present in the pretreatment coating and wherein atomic % of Cu in said pretreatment coating measured at a series of depths from an outer surface of the pretreatment coating to the metal substrate does not exceed 33 atomic % Cu at any of said depths.

13. The article of manufacture according to claim 8 , wherein the metal substrate comprises cold rolled steel.

14. The article of manufacture according to claim 13 , further comprising at least one paint applied to the pretreatment coating resulting in a painted coated substrate that achieves at least 95% paint remaining when tested according to ASTM 3330M (Revised Oct. 1, 2004).

15. The article of manufacture according to claim 13 , further comprising at least one paint applied to the pretreatment coating resulting in a painted coated substrate that achieves 1.9 mm or less average corrosion creep when tested according to ASTM B117 (Revised Dec. 15, 2007) for 500 hours.

Assignees

• Henkel Ag & Co Kgaa

Inventors

• Vonk Donald R
• Kapic Edis
• Sienkowski Michael L

Classifications

• C09D7/1208

  Chemistry & Metallurgy · mapped topic

• B05D3/002

  Pretreatement · CPC title

• C23C22/78

  Pretreatment of the material to be coated · CPC title

• C23C22/83

  Chemical after-treatment · CPC title

• Y10T428/12778

  Alternative base metals from diverse categories · CPC title