High temperature resistant coating compositions
AssigneePraxair S.T. Technology, Inc.
InventorsMark F. Mosser, Kevin Eddinger, Eileen Fox, Thomas F. Lewis, III
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Abstract
An aqueous phosphoric bonding solution consists essentially of phosphoric acid, a source of magnesium ions, and a leachable corrosion inhibitor. The bonding solution is stable with respect to inorganic metal particles, such as aluminum, which are admixed to the bonding solution for the preparation of a coating slurry. Metal parts coated with the coating compositions have very satisfactory properties such as heat and corrosion resistance.
Claims23
An aqueous bonding solution consisting essentially of phosphoric acid, a source of magnesium ions, and a leachable corrosion inhibitor, wherein the solution has a pH from about 2 to about 4.5 and is substantially free of chromate ions.
An aqueous bonding solution consisting essentially of phosphoric acid;
- a source of magnesium ions selected from the group consisting of magnesium oxide, magnesium carbonate, and a combination thereof;
- and a leachable corrosion inhibitor selected from the group consisting of zinc aluminum orthophosphate, zinc aluminum tripolyphosphate, aluminum tripolyphosphate, zinc aluminum polyphosphate, strontium aluminum polyphosphate, modified strontium aluminum polyphosphate, modified zinc calcium polyphosphate, zinc molybdate phosphate, and combinations thereof;
- wherein the solution has a pH from about 2.5 to about 3.5.
An aqueous bonding solution consisting essentially of phosphoric acid, a source of magnesium ions, a source of borate ions, and a leachable corrosion inhibitor, wherein the solution has a pH from about 2 to about 4.5.
Dependencies are inferred from the claim text.