Claims
- 1. A process for protecting an aluminum substrate against atmospheric corrosion comprising:
providing an aluminum surface to be protected, applying a coating to said surface of a protective material selected from a group consisting of di-mercapto and poly-mercapto compounds and their derivatives, said coating substance having a limited solubility in water of between about 0.01 and about 1000 mmoles/per liter of water.
- 2. A process for protecting an aluminum substrate against atmospheric corrosion comprising:
providing an aluminum surface to be protected, applying a coating to said surface of less than approximately 20 microns in thickness of a protective material selected from a group consisting of di-mercapto and poly-mercapto compounds and their derivatives, said coating substance having a limited solubility in water of between about 0.01 and about 1000 mmoles/per liter of water.
- 3. A process according to claim 1 wherein said coating substance has a limited solubility in water of between about 0.1 and about 10 mmoles/per liter of water.
- 4. A process according to claim 1 wherein said coating substance is applied as a saturated solution and is subsequently dried whereby a conversion coating is formed on said substrate, said conversion coating being subsequently coated with a paint.
- 5. A process according to claim 1 wherein said coating substance is incorporated into a silane-based gel coating.
- 6. A process according to claim 1 wherein saidsubstance is selected from the group consisting of 2,5-dimercapto-1,3,4 thiadiazole (DMTD), 2,4-dimercapto-s-triazolo-[4,3-b]-1,3-4-thiadiazole, trithiocyanuric acid (TMT), derivatives of DMTD and derivatives of TMT.
- 7. A process according to claim 1 wherein said substance is selected from the group consisting of 2,5-dimercapto-1,2,4 thiadiazole; 2,4-dimercapto-s-triazolo-[4,3-b]-1,3-4-thiadiazole; 5,5 dithio-bis (1,3,4 thiadiazole-2(3H)-thione and (DMTD)2; (DMTD)n; M(DMTD)n where n=1,2 or 3, and M is a metal cation selected from the group consisting of Zn, Bi, Co, Ni, Cd, Pb, Ag, Sb, or Cu; aryl ammonium salts of DMTD; aryl ammonium salts of (DMTD)n; alkyl ammonium salts of (DMTD),; quaternary ammonium salts of DMTD; quaternary ammonium salts of (DMTD)n; polyaniline, polythiophen, and polypyrrol doped with DMTD; polyaniline, polythiophen, and polypyrrol doped with (DMTD)2 and micro and nano composites of poly DMTD/polyaniline, DMTD polythiophen and poly DMTD/polypyrrol.
- 8. A process according to claim 1 wherein said coating substance is applied by incorporating the same in a curable polymeric coating composition and applying said composition over said substrate.
- 9. A process according to claim 1 wherein said coating substance is selected from the group consisting of: 2,5-dimercapto-1,3,4 thiadiazole (DMTD); 2,4-dimercapto-s-triazolo-[4,3-b]-1,3-4-thiadiazole; an organic derivative of DMTD; N—, S— and N, N—, S— and N, S-substituted derivatives of DMTD, 5,5 dithio-bis(1,3,4 thiadiazole-2(3H)-thione or (DMTD)2 or (DMTD)n a polymer of DMTD; a salt of DMTD of general formula, M(DMTD)n, where n=1,2 or 3, and M is a metal cation and M=Zn, Bi, Co, Ni, Cd, Pb, Ag, Sb, or Cu; a salt of (DMTD)n of general formula M[(DMTD)n]m, where n=2 or n>2, m=1,2, or 3 and M=Zn, Bi, Co, Ni, Cd, Pb, Ag, Sb, or Cu; aryl and alkyl ammonium salts of DMTD and (DMTD)n; quaternary ammonium salts of DMTD and(DMTD)n; polyammonium salts of DMTD and (DMTD)n formed with a polyamines; polyaniline, polypyrrol and polythiophen doped with DMTD; polyaniline, polypyrrol and polythiophen doped with (DMTD)2; a micro and nano composites of poly DMTD/polyaniline, poly DMTD/polypyrrol, and poly DMTD/polythiophen; DMTD , salts of DMTD , and derivatives of DMTD, as constituents of an inorganic matrix; DMTD , salts of DMTD ,and derivatives of DMTD encapsulated form in a polymer matrix, or as a cyclodextrin-inclusion compound; and a combination of said forms.
- 10. A process according to claim 1 wherein said coating substance is selected from the group consisting of:
Trithiocyanuric acid (TMT); S-substituted derivatives of TMT; a salt of TMT of general formula, M(TMT)n, where n=1,2 or 3, and M is a metal cation and M=Zn, Bi, Co, Ni, Cd, Pb, Ag, Sb, or Cu; aryl and alkyl ammonium salts of TMT; quaternary ammonium salts of TMT; polyamines formed with TMT; polyaniline doped with TMT; polypyrroline and polythiophen doped with TMT; micro and nano composites of poly TMT/polyaniline, poly TMT/polypyrrolidone, and poly TMT/polythiophen; TMT, salts of TMT, and derivatives of TMT, as constituents of an inorganic matrix; salts of DMTD ,and derivatives of TMT encapsulated form in a polymer matrix, or as a cyclodextrin-inclusion compound; and a combination of said forms.
- 11. The coating substance of claim 1 wherein the coating substance is used in a paint.
- 12. The paint according to claim 9, whereby the paint is applied to an aluminum surface.
- 13. A process for protecting a steel substrate against atmospheric corrosion comprising:
providing a steel surface to be protected, applying a coating to said surface of less than approximately 20 microns in thickness of a protective material selected from TMT and TMT derivatives.
- 14. A process according to claim 11 wherein said coating substance is applied as a saturated solution and is subsequently dried whereby a conversion coating is formed on said substrate, said coating being subsequently coated with a paint.
- 15. A process according to claim 11 wherein said coating substance is incorporated into a silane-based gel coating.
- 16. A process according to claim 11 wherein said coating substance is selected from the group consisting of:
Trithiocyanuric acid (TMT); S-substituted derivatives of TMT; a salt of TMT of general formula, M(TMT)n, where n=1,2 or 3, and M is a metal cation and M=Zn, Bi, Co, Ni, Cd, Pb, Ag, Sb, or Cu; aryl and alkyl ammonium salts of TMT; quaternary ammonium salts of TMT; polyamines formed with TMT; polyaniline doped with TMT; polypyrroline and polythiophen doped with TMT; micro and nano composites of poly TMT/polyaniline, poly TMT/polypyrrolidone, and poly TMT/polythiophen; TMT, salts of TMT, and derivatives of TMT, as constituents of an inorganic matrix; salts of DMTD ,and derivatives of TMT encapsulated form in a polymer matrix, or as a cyclodextrin-inclusion compound; and a combination of said forms.
- 17. The steel substrate of claim 11, wherein said steel substrate comprises a galvanized steel.
- 18. The coating substance of claim 11, wherein the coating substance is used in a paint.
- 19. The paint according to claim 14, whereby the paint is applied to a steel surface.
- 20. The paint according to claim 14, whereby said paint is applied to a galvanized steel surface.
RELATED APPLICATION
[0001] This application claims the benefit of provisional application Serial No. 60/288,895 filed May 4 2001.
Provisional Applications (1)
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Number |
Date |
Country |
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60288895 |
May 2001 |
US |