Sealing Composition

• US 20190316261A1
• Filed: 08/14/2017
• Published: 10/17/2019
• Est. Priority Date: 08/12/2016
• Status: Active Application

• Current Assignee: PRC-DeSoto International, Inc. (Nouryon BV)
• Original Assignee: PRC-DeSoto International, Inc. (Nouryon BV)
• Inventors: MORRIS, Eric L., POST, Gordon L., MAYO, Michael A., OKERBERG, Brian C., LIM, Mary Lyn Chong
• Application Number:
  US16/325,010
• Publication Number:
  US 20190316261A1
• Time in Patent Office: Days
• CPC Class Codes: C01B 25/37 Phosphates of heavy metals
• CPC Class Codes: C01B 25/372 of titanium, vanadium, zirconium, niobium, hafnium or tantalum
• CPC Class Codes: C09D 5/12 Wash primers
• CPC Class Codes: C23C 22/07 containing phosphates
• CPC Class Codes: C23C 22/12 containing zinc cations
• CPC Class Codes: C23C 22/13 containing also nitrate or nitrite anions
• CPC Class Codes: C23C 22/361 containing titanium, zirconium or hafnium compounds
• CPC Class Codes: C23C 22/56 Treatment of aluminium or alloys based thereon
• CPC Class Codes: C23C 22/66 Treatment of aluminium or alloys based thereon
• CPC Class Codes: C23C 22/73 characterised by the process
• CPC Class Codes: C23C 22/78 Pretreatment of the material to be coated
• CPC Class Codes: C23C 22/82 After-treatment
• CPC Class Codes: C23C 22/83 Chemical after-treatment

Abstract

Disclosed is a method of treating a substrate. The surface is contacted with a sealing composition comprising a lithium cation; and optionally, with conversion composition comprising a cation of a lanthanide, a Group IIIB, and/or a Group IVB metal. The conversion composition is applied to provide a film on the substrate surface resulting in a level of the lanthanide, Group IIIB metal, and/or Group IV metal thereon of at least 100 counts greater than on a surface of a substrate that does not have the film thereon as measured by X-ray fluorescence (measured using X-Met 7500, Oxford Instruments; operating parameters 60 second timed assay, 15 Kv, 45 μA, filter 3, T(p)=1.5 μs for lanthanides, Group IIIB metals, and Group IVB metals except zirconium; operating parameters 60 second timed assay, 40 Kv, 10 μA, filter 4, T(p)=1.5 μs for zirconium). A substrate obtainable by the methods also is disclosed.

Claims

1. A method of treating a substrate comprising:

contacting at least a portion of the substrate surface with a sealing composition comprising a lithium cation;

wherein the sealing composition is applied to provide a layer of the dried sealing composition having a thickness of 5 nm to 550 nm.

2. The method of claim 1, wherein the lithium cation is present in the sealing composition in an amount of 5 ppm to 5500 ppm (as lithium cation) based on total weight of the sealing composition.

3. The method of claim 1, wherein the sealing composition further comprises a carbonate source, a hydroxide source, or combinations thereof.

4. The method of claim 1, wherein the sealing composition further comprises a Group IA metal cation other than lithium, a Group VB metal cation, a Group VIB metal cation, a corrosion inhibitor, an indicator compound, or combinations thereof.

5. The method of claim 1, wherein the pH of the sealing composition is 9.5 to 12.5.

6. The method of claim 1, wherein, following the contacting with the sealing composition, the substrate is not rinsed with water prior to contacting at least a portion of the substrate surface with subsequent treatment compositions.

7. The method of claim 1, wherein the temperature of the sealing composition is 40°

F. to 160°

F.

8. The method of claim 1, wherein the contacting is for 1 second to 15 minutes.

9. The method of claim 1, further comprising contacting at least a portion of the substrate surface with a conversion composition comprising a lanthanide series metal cation, a Group IIIB metal cation, a Group IVB metal cation, or combinations thereof;

wherein the contacting with the conversion composition occurs prior to and/or following the contacting with the sealing composition.

10. The method of claim 9, wherein the conversion composition is applied to provide a film on the substrate resulting in a level of the lanthanide metal, Group IIIB metal cation, and/or Group IV metal cation on the treated substrate surface of at least 100 counts greater than on a surface of a substrate that does not have the film thereon as measured by X-ray fluorescence (measured using X-Met 7500, Oxford Instruments;

operating parameters 60 second timed assay, 15 Kv, 45 μ

A, filter 3, T(p)=1.5 μ

s for lanthanides, Group IIIB metals, and Group IVB metals except zirconium;

operating parameters 60 second timed assay, 40 Kv, 10 μ

A, filter 4, T(p)=1.5 μ

s for zirconium).

11. The method of claim 1, wherein the substrate comprises aluminum, aluminum alloys, or combinations thereof.

12. The method of claim 9, further comprising heating the substrate for 15 minutes to 30 minutes at a temperature of 110°

C. to 232°

C.

13. A substrate treated with the method of claim 1.

14. A system for treating a substrate comprising:

a conversion composition for treating at a least a portion of the substrate, the conversion composition comprising a lanthanide series metal cation, a Group IIIB metal cation, a Group IVB metal cation, or a combination thereof; and

a sealing composition for treating at least a portion of the substrate, the sealing composition comprising a lithium cation.

15. The system of claim 14, wherein the lanthanide series metal cation, Group IIIB metal cation and/or Group IVB metal cation comprises cerium, praseodymium, yttrium, zirconium, titanium, or combinations thereof.

16. The system of claim 14, wherein the lanthanide series metal cation, Group IIIB metal cation and/or the Group IVB metal cation is present in an amount of 50 ppm to 500 ppm, based on a total weight of the conversion composition.

17. The system of claim 14, wherein the lithium cation is present in the sealing composition in an amount of 5 ppm to 30,000 ppm (as lithium cation) based on a total weight of the sealing composition.

18. The system of claim 14, wherein the sealing composition has a pH of 9.5 to 12.5.

19. The system of claim 14, further comprising an alkaline cleaning composition comprising an azole.

20. A substrate treated with the system of claim 14.

21. The substrate of claim 20, wherein the substrate has at least a 50% reduction in the number of pits on the substrate surface compared to a substrate not treated with the sealing composition following 3 day exposure in neutral salt spray cabinet operated according to ASTM B117.

22. The substrate of claim 20, wherein the substrate has at least a 50% reduction in the number of pits on the substrate surface compared to a substrate treated with the conversion composition or the sealing composition but not the conversion composition and the sealing composition following 7 day exposure in neutral salt spray cabinet operated according to ASTM B117.

23. The substrate of claim 20, further comprising a primer layer, an electrocoat layer, and/or a topcoat layer.