US 5,534,082 A · Composition and process for treating metal

Abstract

Heating an aqueous mixture of a fluoroacid such as H.sub.2 TiF.sub.6 and an oxide, hydroxide, and/or carbonate such as silica produces a clear mixture with long term stability against settling of any solid phase, even when the oxide, hydroxide, or carbonate phase before heating was a dispersed solid with sufficiently large particles to scatter light and make the mixture before heating cloudy. The clear mixture produced by heating can either be mixed with water soluble and/or water dispersible polymers, for example with dispersed polymers of the diglycidyl ether of bisphenol-A or an acrylic acid polymer, or with soluble hexavalent and/or trivalent chromium, to produce a composition that improves the corrosion resistance of metals treated with the composition, especially after subsequent painting. Another composition that improves the corrosion resistance of metals after contact with them is an aqueous solution of a mixture of: (A') a water soluble or dispersible polymer having at least one --OH group per polymer molecule selected from the group consisting of polyvinyl alcohol, polyethylene glycol, modified starch, and mixtures thereof, and (B') polymers and copolymers of acrylic and methacrylic acid and their salts.

Claims40

Dependent claims

An aqueous liquid composition suitable for treating aluminum and alloys thereof, said composition consisting essentially of water and:

(A') from about 0.5 to about 50 g/l of a water soluble or dispersible polymer selected from the group consisting of polyvinyl alcohol, polyethylene glycol, modified starch, and mixtures thereof;
(B') from about 0.5 to about 50g/l of polymers and copolymers of acrylic and methacrylic acid and their salts;
(C') a component selected from the group consisting of H.sub.2 TiF.sub.6, H.sub.2 ZrF.sub.6, H.sub.2 HfF.sub.6, H.sub.3 AlF.sub.6, H.sub.2 SiF.sub.6, H.sub.2 GeF.sub.6, H.sub.2 SnF.sub.6, HBF.sub.4, and mixtures thereof;
and, optionally, one or more of the following components:
(D') a component selected from the group consisting of the water insoluble oxides, water insoluble hydroxides, water insoluble carbonates, and water insoluble elemental forms of all of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin;
and
(E') a component selected from the group consisting of water soluble oxides, water soluble carbonates, and water soluble hydroxides of all of Ti, Zr, Hf, B, Al, Si, Ge, and Sn.

4 more elements

A process for treating aluminum and alloys thereof comprising contacting said aluminum with an aqueous liquid composition comprising water and:

(A') from about 0.5 to about 50 g/l of a water soluble or dispersible polymer selected from the group consisting of polyvinyl alcohol, polyethylene glycol, modified starch, and mixtures thereof;
(B') from about 0.5 to about 50 g/l of polymers and copolymers of acrylic and methacrylic acid and their salts;
(C') a component selected from the group consisting of H.sub.2 TiF.sub.6, H.sub.2 ZrF.sub.6, H.sub.2 HfF.sub.6, H.sub.3 AlF.sub.6, H.sub.2 SiF.sub.6, H.sub.2 GeF.sub.6, H.sub.2 SnF.sub.6, HBF.sub.4, and mixtures thereof;
and, optionally, one or more of the following components:
(D') a component selected from the group consisting of the water insoluble oxides, water insoluble hydroxides, water insoluble carbonates, and water insoluble elemental forms of all of titanium, zirconium, hafnium, boron, aluminum, silicon, germanium, and tin;
and
(E') a component selected from the group consisting of water soluble oxides, water soluble carbonates, and water soluble hydroxides of all of Ti, Zr, Hf, B, Al, Si, Ge, and Sn.

4 more elements

Dependencies are inferred from the claim text.

Composition and process for treating metal

Life of this patent

Composition and process for treating metal

Life of this patent

Abstract

Claims40