Composition and method for treatment of conversion coated metal surfaces with an aqueous solution of 3-aminopropyltriethoxy silane and titanium chelate

• US 5,053,081 A
• Filed: 04/02/1990
• Issued: 10/01/1991
• Est. Priority Date: 04/02/1990
• Status: Expired due to Fees

• Current Assignee: Oakite Products Inc. (Albemarle Corporation)
• Original Assignee: Oakite Products Inc. (Albemarle Corporation)
• Inventors: Jacob, Savarimuthu M.
• Primary Examiner(s): Lusignan, Michael
• Assistant Examiner(s): Dudash, Diana L.
• Application Number:
  US07/503,321
• Time in Patent Office: 547 Days
• Field of Search: 427/388.4, 427/388.1, 106/287.11, 106/287.19
• US Class Current: 106/287.11
• CPC Class Codes: C23C 22/83 Chemical after-treatment
• CPC Class Codes: C23C 2222/20 Use of solutions containing silanes

Abstract

A final rinse composition, for enhancing the siccative coating adhesion and corrosion resistance properties of conversion coated metal surfaces, comprising an aqueous solution of a selected organosilane and a selected organotitanate, and a method of use thereof.

Claims

1. A composition of matter, useful for treating a conversion coated metal surface to provide enhanced siccative coating adhesion and corrosion resistance properties thereto, comprising an aqueous solution of:

(a) about 0.2-300 g/l of 3-aminopropyltriethoxysilane; and

(b) about 0.01-100 g/l of an organic titanium chelate comprising, as its reactive components, a tetraalkytitanate, a beta-diketone and an alkanolamine, said chelate containing 8.6% titanium and having a specific gravity (25°

C./25°

C.) of 1.03, a viscosity (cP) at 25°

of about 50, a thickening point of less than -25° and

a flash point of 13°

C. (closed cup), as determined by a Pensky-Martens Closed Tester.

2. A composition of matter as recited in claim 1 wherein said organosilane is present in said solution at a concentration of about 0.2-50 g/l.

3. A composition of matter as recited in claim 2 wherein said organic titanium chelate is present in said solution at a concentration of about 0.01-20 g/l.

4. A composition of matter as recited in claim 3 wherein said organosilane is present in said solution at a concentration of about 2.0-5.0 g/l.

5. A composition of matter as recited in claim 4 wherein said organic titanium chelate is present in said solution at a concentration of about 0.05-10 g/l.

6. A composition of matter consisting essentially of an aqueous solution of:

(a) about 8 w/o 3-aminopropyltriethoxysilane; and

(b) about 1 w/o an organic titanium chelate comprising, as its reactive components, a tetraalkyltitanate, a beta-diketone and an alkanolamine, said chelate containing 8.6% titanium and having a specific gravity (25°

C./25°

C.) of 1.03, a viscosity (cP) at 25°

C. of about 50, a thickening point of less than -25°

C. and a flash point of 13°

C. (closed cup), as determined by a Pensky-Martens Closed Tester.

7. A method of imparting enhanced siccative coating adhesion and corrosion resistance properties to a conversion coated metal surface by contacting said surface with a composition of matter comprising an aqueous solution of:

(a) about 0.2-50 g/l of 3-aminopropyltriethoxysilane; and

(b) about 0.01-20 g/l of an organic titanium chelate comprising, as its reactive components, a tetraalkyltitanate, a beta-diketone and an alkanolamine, said chelate containing 8.6% titanium and having a specific gravity (25°

C./25°

C.) of 1.03, a viscosity (cP) at 25°

C. and a flash point of 13°

C. (closed cup), as determined by a Pensky-Martens Closed Tester.

8. A method as recited in claim 7 wherein said organosilane is present in said solution at a concentration of about 2.0-5.0 g/l.

9. A method as recited in claim 8 wherein said organic titanium chelate is present in said solution at a concentration of about 0.05-10 g/l.