Claims
- 1. A non-chromate conversion coating comprising:sodium metatitanate, sodium fluoride, potassium ferricyanide and nitric acid.
- 2. A non-chromate conversion coating in accordance with claim 1 having a pH ranging from about 1.0 to about 6.0.
- 3. A non-chromate conversion coating in accordance with claim 1 wherein the sodium metatitanate is present in a concentration ranging from greater than 0 to about 1 M, the sodium fluoride is present in a concentration ranging from greater than 0 to about 1 M and potassium ferricyanide is present in a concentration ranging from greater than 0 to about 1 M.
- 4. A non-chromate conversion coating comprising:sodium metatitanate in a concentration ranging from greater than 0 to about 1 M; sodium fluoride in a concentration ranging from greater than 0 to about 1 M; potassium ferricyanide in a concentration ranging from greater than 0 to about 1 M; and nitric acid; wherein the coating has a pH ranging from about 1.0 to about 6.0.
- 5. A non-chromate conversion coating according to claim 4 excluding organic additives, structural component additives and/or chelating agents.
- 6. A non-chromate conversion coating comprising:potassium titanate, sodium fluoride and nitric acid.
- 7. A non-chromate conversion coating in accordance with claim 6 having a pH ranging from about 1.0 to about 6.0.
- 8. A non-chromate conversion coating in accordance with claim 6 potassium titanate is present in an amount ranging from about 4 g/l to about 8 g/l and sodium fluoride is present in an amount ranging from about 2 g/l to about 6 g/l.
- 9. A non-chromate conversion coating comprising:potassium titanate in an amount ranging from about 4 g/l to about 8 g/l; sodium fluoride in an amount ranging from about 2 g/l to about 6 g/l; and nitric acid; wherein the coating has a pH ranging from about 1.0 to about 6.0.
- 10. A non-chromate conversion coating in accordance with claim 9 excluding organic additives, structural component additives and/or chelating agents.
- 11. A method of providing corrosion protection to a metal surface comprising:applying the non-chromate conversion coating of claim 1, 4, 5, 6, 8, 9 or 10 to the metal surface.
- 12. A method in accordance with claim 11 further comprising washing the metal surface with a first solvent; degreasing the metal surface; rinsing the metal surface in deionized water or a second solvent a first time; applying a deoxidizing solution to the metal surface; rinsing the metal surface in deionized water a second time after applying the non-chromate conversion coating; and air drying the metal surface.
- 13. A method in accordance with claim 12 wherein the first solvent is methanol or TCE; the degreaser is a sodium hydroxide solution applied to the metal surface for about 1 minute at a temperature ranging from about 50° C. to about 60° C.; the metal surface is immersed in the deionized water or the second solvent for about ten minutes at about room temperature; and the non-chromate conversion coating has a temperature ranging from about 60° C. to about 80° C.
CROSS REFERENCE TO OTHER PATENT APPLICATIONS
This patent application is co-pending with one related patent application Ser. No. 10/143,173 entitled NON-CHROMATE METAL SURFACE ETCHING SOLUTIONS, by the same inventors as this application.
STATEMENT OF GOVERNMENT INTEREST
The invention described herein may be manufactured and used by or for the Government of the United States of America for Governmental purposes without the payment of any royalty thereon or therefor.
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