Hierarchically structured duplex anodized aluminum alloy
AssigneeUnited Technologies Corporation
InventorsZhongfen (Vivian) Ding, Georgios S Zafiris, Mark R Jaworowski
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Abstract
A method of growing a hierarchically structured anodized film to an aluminum substrate including growing a Phosphoric Acid Anodizing (PAA) film layer to an aluminum substrate and growing a multiple of Tartaric-Sulfuric Acid Anodizing (TSA) film layers under the Phosphoric Acid Anodizing (PAA) film layer.
Claims16
A method of growing a hierarchically structured anodized film to an aluminum substrate, comprising:
- growing a Phosphoric Acid Anodizing (PAA) film layer to an aluminum substrate;
- and
- growing a stepped growth Tartaric-Sulfuric Acid (TSA) film layer underneath said Phosphoric Acid Anodizing (PAA) film layer, wherein said stepped growth TSA film layer is applied by alternating a high voltage and a low voltage to form alternating TSA film layers which have different porosities.
A method of growing a hierarchically structured anodized film to an aluminum substrate, comprising:
- applying a first voltage to an aluminum alloy workpiece within a Tartaric-Sulfuric Acid (TSA) solution to grow a first TSA film layer;
- applying a second voltage higher than the first voltage while the aluminum alloy workpiece is in the Tartaric-Sulfuric Acid (TSA) solution to grow a second TSA film layer more porous than the first layer;
- repeating applying the first voltage to the aluminum alloy workpiece within the Tartaric-Sulfuric Acid (TSA) solution growing another TSA film layer as porous as the first layer;
- and
- repeating applying the second voltage higher than the first voltage while the aluminum alloy workpiece is in the Tartaric-Sulfuric Acid (TSA) solution growing another TSA film layer as porous as the second layer.
A method of growing a hierarchically structured anodized film to an aluminum substrate, comprising:
- applying a first voltage to an aluminum alloy workpiece within a Tartaric-Sulfuric Acid (TSA) solution to grow a first TSA film layer;
- applying a second voltage lower than the first voltage while the aluminum alloy workpiece is in the Tartaric-Sulfuric Acid (TSA) solution to grow a second TSA film layer less porous than the first layer;
- repeating applying the first voltage to the aluminum alloy workpiece within the Tartaric-Sulfuric Acid (TSA) solution growing another TSA film layer as porous as the first layer;
- and
- repeating applying the second voltage lower than the first voltage while the aluminum alloy workpiece is in the Tartaric-Sulfuric Acid (TSA) solution growing another TSA film layer as porous as the second layer.
Dependencies are inferred from the claim text.