Surface applied corrosion inhibitor
A sealer composition for a cementitious substrate, a cementitious structure sealed with the sealer composition, and a method of sealing a steel reinforced cementitious structure with the sealer composition. The sealer composition includes a substantially non-aqueous blend of a first silane, a second silane having a higher molecular weight than the first silane, and a corrosion inhibitor. The corrosion inhibitor is soluble in silane, soluble in solvent-diluted silane, and at least partially soluble in water. The cementitious structure includes a cementitious substrate and the sealer applied to the surface of the substrate and at least partially penetrating into the substrate. The method of sealing a steel reinforced cementitious structure from intrusion of corrosion-causing agents includes applying the sealer to the surface of a steel reinforced cementitious substrate and permitting the sealer composition to penetrate into the substrate to seal the substrate.
1. A sealer composition for a cementitious substrate, comprising a substantially non-aqueous blend of:
a first silane;
a second silane having a higher molecular weight than said first silane; and
at least one corrosion inhibitor,
wherein said corrosion inhibitor is soluble in silane, and soluble in solvent-diluted silane, and at least partially soluble in water, and wherein said corrosion inhibitor comprises a blend of ethynylcarbinolalkoxylate and amine blocked C6-C10 alkyl phosphate monoester.
2. The sealer composition of claim 1 , wherein the molecular weight of said first silane is from about 100 g/mol to about 270 g/mol.
3. The sealer composition of claim 1 , wherein the molecular weight of said second silane is from about 270 g/mol to about 575 g/mol.
4. The sealer composition of claim 1 , wherein the molecular weight of said first silane is from about 150 g/mol to about 250 g/mol, and wherein the molecular weight of said second silane is from about 270 g/mol to about 400 g/mol.
5. The sealer composition of claim 1 , wherein the molecular weight of said first silane is from about 100 g/mol to about 270 g/mol, and wherein the molecular weight of said second silane is from about 270 g/mol to about 576 g/mol.
6. The sealer composition of claim 5 , wherein said first silane comprises isobutyl triethoxysilane, and wherein said second silane comprises n-octyl triethoxysilane.
7. The sealer composition of claim 5 , wherein said first silane is selected from the group consisting of alkyl trialkoxysilanes, dialkyl dialkoxysilanes, and trialkyl alkoxysilanes.
8. The sealer composition of claim 7 , wherein said first silane is selected from the group consisting of methyl trimethoxysilane, ethyl trimethoxysilane, n-butyl trimethoxysilane, isobutyl trimethoxysilane, methyl triethoxysilane, ethyl triethoxysilane, n-butyl triethoxysilane, and isobutyl triethoxysilane.
9. The sealer composition of claim 5 , wherein said second silane is selected from the group consisting of alkyl trialkoxysilanes, dialkyl dialkoxysilanes, and trialkyl alkoxysilanes.
10. The sealer composition of claim 9 , wherein said second silane is selected from the group consisting of n-octyl trimethoxysilane, isooctyl trimethoxysilane, dodecyl trimethoxysilane, hexadecyl trimethoxysilane, n-octyl triethoxysilane, isooctyl triethoxysilane, dodecyl triethoxysilane, and hexadecyl triethoxysilane.
11. A cementitious structure comprising:
a cementitious substrate; and
a penetrating sealer applied to the surface of the cementitious substrate and at least partially penetrating into said substrate, the penetrating sealer comprising a substantially non-aqueous blend of:
a first silane;
a second silane having a higher molecular weight than said first silane; and
at least one corrosion inhibitor, wherein said corrosion inhibitor is soluble in silane, and soluble in solvent-diluted silane, and at least partially soluble in water, and wherein said corrosion inhibitor comprises at least one of:
(a) a blend of ethynylcarbinolalkoxylate and amine blocked C6-C10 alkyl phosphate monoester, or
(b) a blend of dimethyl acetamide and triisobutyl phosphate.
12. The cementitious structure of claim 11 , wherein said cementitious substrate is selected from the group consisting of concrete, masonry, and mortar substrates.
13. The cementitious structure of claim 12 , wherein the molecular weight of said first silane is from about 150 g/mol to about 250 g/mol, and wherein the molecular weight of said second silane is from about 270 g/mol to about 400 g/mol.
14. The cementitious structure of claim 12 , wherein the molecular weight of said first silane is from about 100 g/mol to about 270 g/mol, and wherein the molecular weight of said second silane is from about 270 g/mol to about 575 g/mol.
15. The cementitious structure of claim 14 , wherein said first silane is selected from the group consisting of methyl trimethoxysilane, ethyl trimethoxysilane, n-butyl trimethoxysilane, isobutyl trimethoxysilane, methyl triethoxysilane, ethyl triethoxysilane, n-butyl triethoxysilane, and isobutyl triethoxysilane.
16. The cementitious structure of claim 14 , wherein said second silane is selected from the group consisting of n-octyl trimethoxysilane, isooctyl trimethoxysilane, dodecyl trimethoxysilane, hexadecyl trimethoxysilane, n-octyl triethoxysilane, isooctyl triethoxysilane, dodecyl triethoxysilane, and hexadecyl triethoxysilane.
17. The cementitious structure of claim 14 , wherein said first silane comprises isobutyl triethoxysilane, and wherein said second silane comprises n-octyl triethoxysilane.
18. The cementitious structure of claim 14 , wherein said corrosion inhibitor comprises a blend of ethynylcarbinolalkoxylate and amine blocked C6-C10 alkyl phosphate monoester.
19. The cementitious structure of claim 14 , wherein said corrosion inhibitor comprises a blend of dimethyl acetamide and triisobutyl phosphate.
20. A method of sealing a steel reinforced cementitious structure from intrusion of corrosion-causing agents, comprising:
applying to a surface of said structure to be sealed a penetrating sealer comprising a substantially non-aqueous blend of:
a first silane;
a second silane having a higher molecular weight than said first silane; and
at least one corrosion inhibitor, wherein said corrosion inhibitor is soluble in silane, and soluble in solvent-diluted silane, and at least partially soluble in water, and wherein said corrosion inhibitor comprises at least one of:
(a) a blend of ethynylcarbinolalkoxylate and amine blocked C6-C10 alkyl phosphate monoester, or
(b) a blend of dimethyl acetamide and triisobutyl phosphate;
and permitting the sealer composition to penetrate into the substrate.
21. A sealer composition for a cementitious substrate, comprising a substantially non-aqueous blend of:
a first silane;
a second silane having a higher molecular weight than said first silane; and
at least one corrosion inhibitor,
wherein said corrosion inhibitor is soluble in silane, and soluble in solvent-diluted silane, and at least partially soluble in water, and wherein said corrosion inhibitor comprises a blend of dimethyl acetamide and triisobutyl phosphate.
22. The sealer composition of claim 21 , wherein the molecular weight of said first silane is from about 100 g/mol to about 270 g/mol.
23. The sealer composition of claim 21 , wherein the molecular weight of said second silane is from about 270 g/mol to about 575 g/mol.
24. The sealer composition of claim 21 , wherein the molecular weight of said first silane is from about 150 g/mol to about 250 g/mol, and wherein the molecular weight of said second silane is from about 270 g/mol to about 400 g/mol.
25. The sealer composition of claim 21 , wherein the molecular weight of said first silane is from about 100 g/mol to about 270 g/mol, and wherein the molecular weight of said second silane is from about 270 g/mol to about 576 g/mol.
26. The sealer composition of claim 25 , wherein said first silane comprises isobutyl triethoxysilane, and wherein said second silane comprises n-octyl triethoxysilane.
27. The sealer composition of claim 25 , wherein said first silane is selected from the group consisting of alkyl trialkoxysilanes, dialkyl dialkoxysilanes, and trialkyl alkoxysilanes.
28. The sealer composition of claim 27 , wherein said first silane is selected from the group consisting of methyl trimethoxysilane, ethyl trimethoxysilane, n-butyl trimethoxysilane, isobutyl trimethoxysilane, methyl triethoxysilane, ethyl triethoxysilane, n-butyl triethoxysilane, and isobutyl triethoxysilane.
29. The sealer composition of claim 25 , wherein said second silane is selected from the group consisting of alkyl trialkoxysilanes, dialkyl dialkoxysilanes, and trialkyl alkoxysilanes.
30. The sealer composition of claim 29 , wherein said second silane is selected from the group consisting of n-octyl trimethoxysilane, isooctyl trimethoxysilane, dodecyl trimethoxysilane, hexadecyl trimethoxysilane, n-octyl triethoxysilane, isooctyl triethoxysilane, dodecyl triethoxysilane, and hexadecyl triethoxysilane.