Corrosion resistant conversion coatings
AssigneeDeft, Inc.
InventorEric L. Morris
Life of this patent
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Abstract
A conversion coating composition for coating a metal substrate is provided which imparts corrosion resistance to the underlying metal substrate. The conversion coating composition comprises an aqueous carrier and first and second rare earth element salts. A complete coating system employing the conversion coating composition is also provided as well as methods for conversion coating a metal substrate with the rare earth element conversion coating compositions of the present invention.
Claims19
A composition for coating a metal substrate comprising:
- an aqueous carrier;
- an oxidizing agent;
- and
- first and second salts, the first salt comprising a rare earth element nitrate, and the second salt comprising a rare earth element halide, and the first and second salts in combination are present in the composition in an amount effective to form a corrosion resistant coating on the metal substrate.
A composition for coating a metal substrate comprising:
- an aqueous carrier;
- first and second salts, wherein
- the first salt is cerium nitrate, present in the composition in an amount from about 0.01 weight percent to about 24 weight percent;
- the second salt is cerium chloride, present in the composition in an amount from about 0.03 weight percent to about 60 weight percent;
- and
- an oxidizing agent comprising a 30 weight percent hydrogen peroxide solution, present in the composition in an amount of from about 0.1 weight percent to about 15 weight percent.
A composition for coating a metal substrate, the composition consisting essentially of:
- an aqueous carrier;
- first and second rare earth element salts, wherein
- the first rare earth element salt is cerium nitrate or neodymium nitrate;
- the second salt is cerium chloride, wherein the first and second salts in combination are present in the composition in an amount effective to form a corrosion resistant coating on the metal substrate;
- and
- an oxidizing agent.
Dependencies are inferred from the claim text.