CORROSION RESISTANT COATING
A process has been developed which will provide a product that simulates zinc phosphate by providing a corrosion resistant coating on materials including but not limited to, steel, hot dipped galvanized or electrogalvanized metal. The simulated product provides very similar, if not the same, physical and visual attributes as zinc phosphated materials. The process is one, which does not require a convention chemical tank, as it can be roll applied, thereby allowing for broader applications.
1 . A corrosion resistant coating comprising
(a) a film forming polymer in an amount of from 50 to 70% by weight selected from acrylic polymers, polyfluorocarbons, vinyl ether copolymers, poysaccharides or blends of an acrylic polymer and lubricants;
(b) dye selected from carbon black, ceramic, titanium dioxide, and combinations thereof;
(c) silica;
(d) a passivation agent selected from chromium salts, zirconium salts, titanium salts, cerium salts, silanes, and combinations thereof; and
(e) water;
wherein the dye is effective to create on a material treated with the corrosion resistant coating a similar appearance as a material actually treated with a zinc phosphate.
2 . (canceled)
3 . The corrosion resistant coating of claim 1 which can be roll applied or flow squeegee applied.
4 . (canceled)
5 . (canceled)
6 . The corrosion resistant coating of claim 1 wherein the polymer is present in an amount of from about 55 to about 65% by weight.
7 . (canceled)
8 . The corrosion resistant coating of claim 7 wherein the passivation agent is present in an amount of from about 10 to about 20% by weight.
9 . The corrosion resistant coating of claim 7 wherein the passivation agent chromate is present in an amount of from about 12.5 to about 17.5% by weight.
10 . The corrosion resistant coating of claim 1 wherein the dye is present in an amount of from about 20 to 30% by weight.
11 . The corrosion resistant coating of claim 1 wherein the dye is present in an amount of from about 22.5 to about 27.5% by weight.
12 . A process for producing a corrosion reducing coating comprising
(a) mixing together a polymer which is a film forming polymer in an amount of from 50 to 70% by weight selected from acrylic polymers, polyfluorocarbons, vinyl ether copolymers, polysaccharides or blends of an acrylic polymer and lubricants, a passivation agent and a dye,
(b) adding silica to the mixture of step (a) in an amount of from about 20 to about 100 grams of silica per liter of the mixture (about 0.2 to about 1.0 pounds of silica per gallon of the mixture); and
(c) agitating the mixture of step (b).
13 . The process of claim 12 which further comprises applying the mixture from step (c) to a material to be treated.
14 . The process of claim 13 wherein the material to be treated is chosen from the group comprising steel, hot dipped galvanized or electrogalvanized metal, or combinations thereof.
15 . The process of claim 13 wherein the application is carried out by roll coater or a by flow squeegee method.
16 . The corrosion resistant coating of claim 1 further comprising a pigment.
17 . The corrosion resistant coating of claim 16 wherein the dye or pigment is effective to create on a material treated with the corrosion resistant coating a similar appearance as a material actually treated with a zinc phosphate.