Chromium-free, metal surface-treating composition and surface-treated metal sheet
First Claim
1. A chromium-free composition for treating the surface of metals, the composition comprising:
- (a) a hydroxyl group-containing organic resin;
(b) a phosphoric acid; and
(c) a metal ion or metal compound capable of supplying ions in the composition, the metal being at least one metal selected from the group consisting of Cu, Co, Fe, Mn, Sn, V, Mg, Ba, Al, Ca, Sr, Nb, Y and Zn,wherein the composition comprises from about 2 to about 50 parts by weight of the phosphoric acid by 100 parts by weight of the hydroxyl group-containing organic resin, and the composition further comprises at least one colloid, sol, or powder selected from the group consisting of SiO2, Fe2 O3, Fe3 O4, MgO, ZrO2, SnO2, Al2 O3 and Sb2 O5 said composition being effective to provide corrosion resistance to a metal when applied to the surface of said metal in an amount to provide a coating weight of from about 0.1 g/m2 to about 3.0 g/m2 on dry basis.
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Accused Products
Abstract
A chromium-free composition for treating metal surface comprising (a) a hydroxyl group-containing organic resin, (b) a phosphoric acid and (c) at least one of ions and compounds of at least one metal selected from the group consisting of Cu, Co, Fe, Mn, Sn, V, Mg, Ba, Al, Ca, Sr, Nb, Y and Zn, and (d) at least one of colloids (sol) or powders of SiO2, SnO2, Fe2 O3, Fe3 O4, MgO, ZrO2, Al2 O3 and Sb2 O5 ; as well as a metal sheet or metal article having thereon (i) a coating film of the chromium-free composition and optionally (ii) a coating film of a coating composition comprising an organic resin and if desired a colloid (sol) or a powder.
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Citations
12 Claims
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1. A chromium-free composition for treating the surface of metals, the composition comprising:
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(a) a hydroxyl group-containing organic resin; (b) a phosphoric acid; and (c) a metal ion or metal compound capable of supplying ions in the composition, the metal being at least one metal selected from the group consisting of Cu, Co, Fe, Mn, Sn, V, Mg, Ba, Al, Ca, Sr, Nb, Y and Zn, wherein the composition comprises from about 2 to about 50 parts by weight of the phosphoric acid by 100 parts by weight of the hydroxyl group-containing organic resin, and the composition further comprises at least one colloid, sol, or powder selected from the group consisting of SiO2, Fe2 O3, Fe3 O4, MgO, ZrO2, SnO2, Al2 O3 and Sb2 O5 said composition being effective to provide corrosion resistance to a metal when applied to the surface of said metal in an amount to provide a coating weight of from about 0.1 g/m2 to about 3.0 g/m2 on dry basis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification