Titanium and magnesium compound for corrosion-resistant coatings

Patent metadata

Field	Value
Publication number	US-2023193051-A1
Application number	US-202318154469-A
Country	US
Kind code	A1
Filing date	Jan 13, 2023
Priority date	Aug 15, 2019
Publication date	Jun 22, 2023
Grant date	—

Abstract

A crystalline titanium and magnesium compound having an X-ray diffraction pattern having interplanar spacing (d-spacing) values at about 5.94, 3.10, 2.97, 2.10, 1.98, 1.82, and 1.74±0.1 angstroms may be used in protective coatings for metal or metal alloy substrates. The coatings exhibit excellent corrosion resistances and provide corrosion protection equal to or better than typical non-chromate coatings.

First claim

What is claimed is:

1 . A crystalline titanium and magnesium compound, having an X-ray diffraction (XRD) pattern having interplanar spacing (d-spacing) values at 5.94, 3.10, and 2.97 angstroms.

2 . The crystalline titanium and magnesium compound of claim 1 , wherein the XRD pattern has additional interplanar spacing (d-spacing) values at 1.98, 1.82, and 1.74 angstroms.

3 . The crystalline titanium and magnesium compound of claim 1 , further having a cubic symmetry and a lattice parameter from about 10.225 angstroms to about 10.325 angstroms.

4 . The crystalline titanium and magnesium compound of claim 1 , further having an XRD pattern, produced with an x-ray wavelength of 1.54 angstroms (Cu k alpha), having peaks at 14.89°, 28.78°, and 30.09°±0.25 2θ.

5 . The crystalline titanium and magnesium compound of claim 4 , further having XRD peaks, produced with an x-ray wavelength of 1.54 angstroms (Cu k alpha), at 45.85°, 50.20°, and 52.66°±0.25 2θ.

6 . The crystalline titanium and magnesium compound of claim 1 , wherein titanium is present at about 15 at % to about 25 at % and magnesium is present at about 1 at % to about 8 at %.

7 . The crystalline titanium and magnesium compound of claim 6 , further comprising oxygen and fluorine.

8 . The crystalline titanium and magnesium compound of claim 7 , wherein the oxygen is present at about 30 at % to about 45 at % and the fluorine is present at about 30 at % to about 40 at %.

9 . The crystalline titanium and magnesium compound of claim 8 , wherein titanium is present at about 25 at %, magnesium is present at about 5 at %, oxygen is present at about 35 at %, and fluorine is present at about 35 at %.

10 . A protective coating comprising a crystalline titanium and magnesium compound having an X-ray diffraction (XRD) pattern having interplanar spacing (d-spacing) values at 5.94, 3.10, and 2.97 angstroms.

11 . The protective coating of claim 10 , further comprising titanium dioxide.

12 . The protective coating of claim 10 , having a thickness of about 500 nm to about 10 μm.

13 . The protective coating of claim 10 , having a polarization resistance of 80 kOhms-cm 2 to 3,000 kOhms-cm 2 .

14 . The protective coating of claim 13 , having a polarization resistance of 100 kOhms-cm 2 to 400 kOhms-cm 2

15 . A method comprising,
preparing a titanium/magnesium solution comprising a titanium compound, boric acid, sodium tetraborate, and a magnesium compound; and precipitating, from the titanium/magnesium solution, a crystalline titanium and magnesium compound having an X-ray diffraction (XRD) pattern having interplanar spacing (d-spacing) values at 5.94, 3.10, and 2.97 angstroms.

16 . The method of claim 15 , wherein the titanium compound comprises ammonium hexafluorotitanate and the magnesium compound comprises one or more of magnesium acetate, magnesium sulfate, magnesium chloride, or magnesium nitrate.

17 . The method of claim 15 , wherein preparing the titanium/magnesium solution comprises:
dissolving the boric acid, the sodium tetraborate, and the magnesium compound in water to form a first solution; dissolving the titanium compound in water to form a second solution; and pouring the second solution into the first solution.

18 . The method of claim 15 , further comprising:
reacting a metal surface with the titanium/magnesium solution; and drying the metal surface with the titanium/magnesium solution to form a titanium/magnesium protective coating on the metal surface.

19 . The method of claim 18 , further comprising applying a primer and/or a paint on the titanium/magnesium protective coating.

20 . The method of claim 18 , wherein the metal surface comprises aluminum or an aluminum alloy substrate selected from 2024-T3 aluminum alloy, 6061 aluminum alloy, or 7075 aluminum alloy.

Assignees

• Boeing Co

Inventors

• Vajo John J
• Graetz Jason
• Adjorlolo Alain A

Classifications

• C01G23/002

  Compounds containing titanium, with or without oxygen or hydrogen, and containing two or more other elements (C01G23/001, C01G23/003 take precedence) · CPC title

• C01P2002/74

  by peak-intensities or a ratio thereof only · CPC title

• C23C22/54

  Treatment of refractory metals or alloys based thereon · CPC title

• C01P2002/76

  by a space-group or by other symmetry indications · CPC title

• C01P2004/03

  obtained by SEM · CPC title