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The inventors have discovered that a combination of water with an appropriate solvent are required to effectively solubilize these mercapto-substituted silanes in a water matrix.

Specifications for testing the effectiveness of the corrosion inhibition and adhesion promotion of various treatments have been established. It’s not possible mmsds diagnose a finishing problem or the hazards of an operation via these pages. A method according to claim 6 wherein the concentration of the mercapto-substituted silane in the treatment solution is from 0.

ISOPREP by MACDERMID INC Material Safety Data Sheet #CGLCZ.

A method according to claim 1 wherein the metal is selected from the group consisting of aluminum and aluminum alloys. Beccaria et al, Corros. The inventors have found that it is important to dry and bake the treated metal after application of the mercapto-substituted silane in order to properly cure the silane coating on the metal surface.

Steel sheet with enhanced corrosion resistance having a silane treated silicate coating. All information presented is for general reference and does not represent a professional opinion nor the policy of an author’s employer. A method according to claim 2 wherein the metal is selected from the group consisting of aluminum and aluminum alloys.

Treatment of the metal surfaces with the composition of this invention inhibits corrosion of that surface and also improves adhesion of subsequent organic coatings to the treated surface.

Any help would be greatly appreciated David A. Thus, there remains a need for a simple, low cost, effective technique for inhibiting corrosion of metals, particularly for aluminum and aluminum alloys.

Sjon Westre – Minden, Nevada. The silane treatment solution of this invention can become unstable over time.

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Prior art techniques for improving corrosion resistance of metals widely employ the use of chromate conversation coatings to passivate the surface. Method of treating metals using vinyl silanes and multi-silyl-functional silanes in admixture.

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The inventors have found that using an aqueous solution of the foregoing solvents and the mercapto-substituted silane, the treatment solution will naturally make up at a pH of about 4. Once the mercapto-substituted silane is applied to the metal surface the treated metal should be baked in order to dry and cure the coating.

Phosphate conversion coatings are also used, but generally provide substantially less corrosion protection unless used in conjunction with a chromate. Military specification MIL-CD provides specific procedures for measuring the corrosion resistance of a treated part.

Preferably, the contact occurs at room temperature and lasts for from 15 seconds to several minutes. The concentration of mercapto-substituted silane may range from 0. The mercapto-substituted silane of this invention is preferably a multifunctional mercapto-substituted organic silane of the following chemical formula: The inventors have found that salt spray corrosion resistance in excess of 1, hours on T6 aluminum alloy and in excess of hours on T3 aluminum alloy can be achieved with the process of this invention.

You can purchase it though most fine chemical suppliers like Fisher Scientific.

ISOPREP 177

I believe it is a cleaner. A variety of known cleaners, deoxidizers and etchants may be employed for this purpose, with the appropriate choice being made with the specific metal surface to be prepared in mind. The inventors have unexpectedly discovered that the mercapto group on these mercapto-substituted silanes provides significantly better corrosion protection than is provided by other silanes which do not have the mercapto substituted group.

ASTM B is another widely used specification for determining the corrosion resistance of a metal treated part with a salt spray procedure. The concentration of mercapto-substituted silane in the treatment solution will affect the corrosion protection achieved, with better corrosion protection achieved at higher concentrations.

Matienzo et al, ACS Symp. Underhill et al, Prog. The inventors have found gamma-mercaptopropyltrimethoxy silane to be the most preferred mercapto-substituted silane for use in this invention.

I’m stretching my memory on the DWbut believe thats a hexavalent chromate conversion coating we used many years ago These adhesion procedures usually include a cross-hatch tape test whereby the organic coating is cut in a specified cross-cut pattern and tape is applied and removed to determine the quantity, if any, of the organic coating that is removed.

The compositions and methods of this invention are particularly suitable for treating aluminum and aluminum alloys. As a result of this potential instability, it may be useful to prepare a concentrated solution of the mercapto-substituted silane without water that is storage stable and is then added to water to prepare the treatment solution. A method according to claim 1 wherein the mercapto-substituted silane is a multifunctional mercapto-substituted silane having the following chemical structure: US USB1 en For instance, the inventors have found that strongly acid etchants work better on T6 aluminum alloy while strongly basic etchants work better on T3 aluminum alloy.

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Recently, various techniques for eliminating the use of chromates in corrosion inhibition and adhesion promotion treatments have been proposed. A method according to claim 6 wherein the metal is subjected to a process selected from the group consisting of cleaning, deoxidizing, etching and combination of the foregoing, prior to contacting the metal with the treatment solution.

Wherein R 1R 2 and R 3 are independently selected mwds the group comprising of alkoxy groups, alkyl groups and hydrogen, and wherein n is an integer from 0 to Preferably, the metal surfaces are cleaned and etched prior to treatment with the process of this invention.

For reasons that I can’t really appreciate, as a general rule the conglomerates who have gobbled up the old lines seem to be discouraging perpetuation of the former brand names. In addition, excellent adhesion of organic coatings to the treated metal surfaces can be achieved with the process of this invention. Corrosion of metal surfaces, particularly aluminum or aluminum alloy surfaces, is inhibited by contacting the metal surfaces with a solution comprising a mercapto-substituted silane and then preferably baking the metal to cure the silane coating.

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A particularly preferred mercapto-substituted silane is gamma-mercaptopropyltrimethoxy silane which has the following structure: Metal sheet with enhanced corrosion resistance having a silane treated aluminate coating.

Organosilicon metal surface treating agent taking oxygen-containing bis-silane as major film forming agent. Similar specifications, such as ASTM D, have been prepared to test the adhesion of organic coatings to treated metal surfaces.

The composition of the mercapto-substituted silane treatment solution and the corrosion resistance results are given below in Table I. Matienzo et al, J. Wherein R 1R 2 and R 3 are independently selected from the group consisting of alkoxy groups e. Method for treating metal surfaces using a silicate solution and a silane solution.