Mixed acid anodization
AssigneeRtx Corporation
InventorsLei Chen, Mimi Nguyen-Vu
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Abstract
Disclosed are methods of anodizing a metal component. In the methods an anodization bath includes an organic acid.
Claims14
A method of making an anodized metal component comprising anodizing a metal component in a first anodizing bath to form an initial anodization layer and anodizing the metal component with the initial anodization layer in a second anodizing bath to form a metal component with a final anodization layer wherein the first and second anodizing baths comprise at least one inorganic acid selected from the group consisting of sulfuric acid, boric acid and phosphoric acid, and an organic acid and the first anodizing bath and the second anodizing baths have different compositions and operating temperatures;
- wherein anodizing is performed by applying a DC voltage ramped from 0 to a plateau voltage over a period of 1 to 5 minutes, the plateau voltage can vary from 13 to 20 volts and is maintained for a duration of 10 to 25 minutes;
- wherein sulfuric acid is present in the first anodizing bath or the second anodizing bath in an amount of 5 grams per liter (g/L) to 60 g/L;
- and
- wherein the first anodization bath comprises organic acid in an amount of 0.5 g/L to 100 g/L and the second anodizing bath comprises organic acid in an of 1 g/L to 30 g/L.
A method of making an anodized metal component comprising anodizing a metal component in a first anodizing bath to form an initial anodization layer and anodizing the metal component with an initial anodization layer in a second anodizing bath to form a metal component with a final anodization layer wherein the first anodizing bath comprises at least one inorganic acid selected from the group consisting of sulfuric acid, boric acid and phosphoric acid, and an organic acid and the second anodizing bath comprises at least two inorganic acids selected from the group consisting of sulfuric acid, boric acid and phosphoric acid;
- wherein anodizing is performed by applying a DC voltage ramped from 0 to a plateau voltage over a period of 1 to 5 minutes, the plateau voltage can vary from 13 to 20 volts and is maintained for a duration of 10 to 25 minutes;
- wherein the first anodizing bath or the second anodizing bath comprise sulfuric acid in an amount of 5 g/L to 60 g/L;
- and
- wherein the first anodizing bath comprises the organic acid in an amount of 0.5 g/L to 100 g/L and the second anodizing bath comprises boric acid in an amount of 0.5 g/L to 15 g/L.
Dependencies are inferred from the claim text.