Aqueous coating compositions and coated metal surfaces
First Claim
1. A method of increasing the corrosion resistance of iron, steel and zinc-coated surfaces which comprises contacting the surface with an aqueous coating composition to provide a first coating on the surface, wherein the aqueous coating composition comprises:
- (A) at least one cyclic hydroxy compound selected from the group consisting of cyclic polyhydroxy compounds and substituted phenols;
(B) phosphate ions;
(C) at least one organic oxidizer-accelerator; and
(D) water.
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Accused Products
Abstract
Aqueous coating compositions are described which comprise
(A) at least one cyclic hydroxy compound selected from the group consisting of cyclic polyhydroxy compounds and substituted phenols;
(B) phosphate ions;
(C) at least one oxidizer-accelerator; and
(D) water.
The coating compositions also may contain fluoride ions and/or iron. A method of improving the corrosion resistance of iron, steel, and zinc-coated surfaces also is described, and the method comprises contacting the surfaces with an aqueous acidic coating composition as described above. The coated metal surfaces may be subsequently provided with an organic or inorganic top-coat or seal-coat resulting in improved corrosion resistance, adhesion and detergent resistance properties.
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Citations
12 Claims
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1. A method of increasing the corrosion resistance of iron, steel and zinc-coated surfaces which comprises contacting the surface with an aqueous coating composition to provide a first coating on the surface, wherein the aqueous coating composition comprises:
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(A) at least one cyclic hydroxy compound selected from the group consisting of cyclic polyhydroxy compounds and substituted phenols; (B) phosphate ions; (C) at least one organic oxidizer-accelerator; and (D) water. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of increasing the corrosion resistance of iron, steel and zinc-coated surfaces which comprises contacting the surface with an aqueous coating composition to provide a first coating on the surface, wherein the aqueous coating composition comprises:
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(A) at least one cyclic hydroxy compound selected from the group consisting of cyclic polyhydroxy compounds and substituted phenols; (B) phosphate ions; (C) at least one of nitroguanidine and halo- and nitro-substituted benzene sulfonic acid and alkali metal and ammonium salts thereof; and (D) water. - View Dependent Claims (12)
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Specification