Methods and compositions for forming magnetite coatings on ferrous metals
AssigneeBirchwood Laboratories, Inc.
InventorsZach D. Johnson, Ross Eric Haugberg
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Abstract
The present invention relates to methods and compositions for coating ferrous metal substrates. In an embodiment, the invention includes a composition for forming a magnetite coating on a ferrous metal substrate. The composition comprising an aqueous oxidizing solution. The aqueous oxidizing solution comprising an alkali metal hydroxide, an alkanolamine, and a chloride salt. In an embodiment, the invention includes a method of forming a magnetite coating on a ferrous metal substrate. The method including contacting the ferrous metal substrate with an aqueous oxidizing solution, the aqueous oxidizing solution comprising an alkali metal hydroxide, an alkanolamine, and a chloride salt. Other embodiments are also included herein.
Claims20
A composition for forming a magnetite coating on a ferrous metal substrate comprising:
- an aqueous oxidizing solution, the aqueous oxidizing solution comprising
- an alkali metal hydroxide;
- an alkanolamine;
- and
- a chloride salt;
- wherein the aqueous oxidizing solution has a pH above 10.0.
A composition for forming a magnetite coating on a ferrous metal substrate comprising:
- an aqueous oxidizing concentrate, the aqueous oxidizing concentrate comprising
- an alkali metal hydroxide;
- an alkanolamine;
- and
- a chloride salt;
- wherein the aqueous oxidizing concentrate comprises about 0.1 to about 15 grams per liter of the alkanolamine.
A composition for forming a magnetite coating on a ferrous metal substrate comprising:
- an aqueous oxidizing solution, the aqueous oxidizing solution comprising
- an alkali metal hydroxide;
- an alkanolamine;
- a chloride salt;
- and
- a molybdate salt;
- wherein the aqueous oxidizing solution comprises about 0.01 to about 5 grams per liter of the molybdate salt and/or about 0 parts to about 3 parts of the molybdate salt per 100 parts of non-aqueous components of the composition.
Dependencies are inferred from the claim text.