Method of preventing corrosion of metals using silanes
First Claim
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1. A method of treating a metal substrate to improve corrosion resistance, comprising the steps of:
- (a) providing a metal substrate; and
(b) applying a coating of a first treatment solution directly onto the surface of said metal, said first treatment solution consisting essentially of at least one multi-functional silane having at least two trisubstituted silyl groups wherein the substituents are individually chosen from the group consisting of alkoxy and acetoxy, wherein said multi-functional silane has been at least partially hydrolyzed, and wherein said first treatment solution has a pH of less than about 7.
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Abstract
A method of preventing corrosion of metals using silanes. The method comprises applying a first treatment solution directly onto the surface of the metal, wherein the first treatment solution contains at least one multi-functional silane having at least two trisubstituted silyl groups, and wherein the substituents are individually chosen from the group consisting of alkoxy and acetoxy. An optional second treatment solution containing an organofunctional silane may also be employed, particularly if the metal is to be painted.
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Citations
43 Claims
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1. A method of treating a metal substrate to improve corrosion resistance, comprising the steps of:
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(a) providing a metal substrate; and (b) applying a coating of a first treatment solution directly onto the surface of said metal, said first treatment solution consisting essentially of at least one multi-functional silane having at least two trisubstituted silyl groups wherein the substituents are individually chosen from the group consisting of alkoxy and acetoxy, wherein said multi-functional silane has been at least partially hydrolyzed, and wherein said first treatment solution has a pH of less than about 7. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of treating an aluminum or aluminum alloy surface in order to improve corrosion resistance, comprising the steps of:
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(a) providing a treatment solution consisting essentially of at least one multi-functional silane which has been at least partially hydrolyzed, said at least one multi-functional silane having at least two trisubstituted silyl groups wherein the substituents are individually chosen from the group consisting of alkoxy and acetoxy; and (b) applying a coating of said solution directly onto said surface. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 36)
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32. A method of pretreating cold-rolled steel prior to painting in order to improve corrosion resistance, comprising the steps of:
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(a) providing a first treatment solution consisting essentially of at least one multi-functional silane which has been at least partially hydrolyzed, wherein said multi-functional silane has at least two trialkoxysilyl groups; (b) providing a second treatment solution comprising at least one organofunctional silane which has been at least partially hydrolyzed; (c) applying a coating of said first treatment solution directly onto the surface of the steel; and (d) thereafter applying a coating of said second treatment solution onto said steel. - View Dependent Claims (33, 34, 35, 37, 38, 39, 40, 41, 42, 43)
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Specification