Aqueous coating compositions and coated metal surfaces
First Claim
1. An aqueous metal surface treatment composition comprising:
- (A) at least one polyhydroxy functional cyclic compound selected from the group consisting of polyhydroxy phenolic compounds and heterocyclic nitrogen-containing compounds having polyhydroxy functionality;
(B) phosphate ions;
(C) at least one 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
21 Claims
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1. An aqueous metal surface treatment composition comprising:
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(A) at least one polyhydroxy functional cyclic compound selected from the group consisting of polyhydroxy phenolic compounds and heterocyclic nitrogen-containing compounds having polyhydroxy functionality; (B) phosphate ions; (C) at least one oxidizer-accelerator; and (D) water. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An aqueous metal surface treatment composition comprising:
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(A) about 0.01% to about 1.5% by weight of a polyhydroxy functional cyclic compound selected from the group consisting of catechol, methylene-bridged poly(alkylphenols), coumaryl alcohol, coniferyl alcohol, hydroxyalkyl celluloses, lignin, tannin material and sinapyl alcohol; (B) about 0.01% to about 3% by weight of phosphate ions; (C) about 0.01% to about 3% by weight of at least one oxidizer-accelerator which is selected from the group consisting of alkali metal chlorates, alkali metal bromates, alkali metal perchlorates, alkali metal chlorites, alkali metal nitrates, alkali metal nitrites, alkali metal perborates and alkali metal salts of meta-nitro benzene sulfonic acid; and (D) water. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification