Compositions and methods for darkening and imparting corrosion-resistant properties to zinc or other active metals
AssigneeMetal Coatings International Inc.
InventorsMichelle Pearce, Brian Straka, Donald Guhde, Terry Dorsett
Life of this patent
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Abstract
Methods and compositions that serve to both darken a zinc or other active! metal surface and impart corrosion-resistant properties thereto, are disclosed. The compositions include an aqueous solution containing about 0.1 percent to about 5 percent ammonium chloride and about 0.1 percent to about 5 percent ammonium molybdate. The compositions utilize particular ratios of concentrations of ammonium chloride and ammonium molybdate.
Claims36
A composition adapted for darkening and imparting corrosion-resistant properties to a metallic surface selected from zinc, magnesium, manganese, and alloys and intermetallic mixtures thereof, the composition consisting essentially of:
- from about 0.1 percent to about 5 percent ammonium chloride;
- from about 0.1 percent to about 5 percent ammonium molybdate;
- and
- from about 90 percent to about 99.8 percent water;
- wherein the ratio of ammonium chloride to ammonium molybdate is from about 1:2 to about 2:1.
(canceled)
An aqueous composition adapted for application to a metallic surface selected from zinc, magnesium, manganese, and alloys and intermetallic mixtures thereof, the composition comprising:
- from about 0.1 percent to about 5 percent ammonium chloride;
- and
- from about 0.1 percent to about 5 percent ammonium heptamolybdate;
- wherein the ratio of ammonium chloride to ammonium heptamolybdate is from about 1:3 to about 3:1.
A coated metallic substrate comprising:
- a metal substrate having an outer surface, wherein said metal is selected from the group consisting of zinc, magnesium, manganese, and alloys and intermetallic mixtures thereof;
- and
- a darkening coating disposed on said substrate, said coating formed from an aqueous composition consisting essentially of (i) from about 0.1 percent to about 5 percent ammonium chloride, and (ii) from about 0.1 percent to about 5 percent ammonium molybdate, wherein the ratio of ammonium chloride to ammonium molybdate is from about 1:2 to about 2:1.
(canceled)
A method for darkening the surface of zinc comprising:
- providing a substrate having an outer surface of zinc;
- providing a composition including from about 0.1 percent to about 5 percent ammonium chloride and from about 0.1 percent to about 5 percent ammonium molybdate;
- and
- applying said composition to said outer surface of said zinc to form a darkening coating thereon.
A method for imparting corrosion inhibiting properties to a substrate of an active metal, said method comprising:
- providing a substrate of an active metal;
- providing a composition including from about 0.1 percent to about 5 percent ammonium chloride and from about 0.1 percent to about 5 percent ammonium molybdate, wherein the ratio of ammonium chloride to ammonium molybdate is from about 1:3 to about 3:1;
- and
- applying said composition to said substrate.
A method for imparting corrosion resistance properties to a zinc surface, said method comprising:
- providing a component having an outer surface of zinc;
- providing a composition including from about 0.1 percent to about 5 percent ammonium chloride and from about 0.1 percent to about 5 percent ammonium molybdate;
- and
- applying said composition to said outer surface of said zinc.
Dependencies are inferred from the claim text.