Nano-structured inorganic zinc phosphate corrosion...

Details Nano-structured inorganic zinc phosphate corrosion... Nano-structured inorganic zinc phosphate corrosion...

2004-07-06

2009-08-25

Fletcher, III, William Phillip (Department: 1792)

Coating processes

Applying superposed diverse coating or coating a coated base

Synthetic resin coating

C427S419200, C427S419800

Reexamination Certificate

active

07579049

ABSTRACT:
A method is provided for enhancing corrosion resistance of a metal surface that includes the step of forming a sol-gel coating in which nanostructured zinc phosphate (Zn3(PO4)2) and zinc oxide (ZnO) phases are present in the mixture. The method may include the steps of mixing an organosilane, organometallic, organic acid, water, and alcohol, and allowing the components of the mixture to partially hydrolyze, followed by adding at least one component having zinc functionality and at least one component having phosphate functionality to the partially hydrolyzed mixture, wherein the zinc component and phosphate component are added in a molar ratio of from about 1.5:1 to about 5:1 (Zn:PO4). The resulting mixture can be applied as a coating to a metal surface to improve the corrosion resistance of the metal and to enhance the adhesion of resinous materials to the metal surface.

REFERENCES:
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patent: 5814137 (1998-09-01), Blohowiak et al.
patent: 5939197 (1999-08-01), Blohowiak et al.
patent: 6579472 (2003-06-01), Chung et al.
patent: 2003/0024432 (2003-02-01), Chung et al.

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