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US 11,299,815 B2Granted
Hierarchically structured duplex anodized aluminum alloy
AssigneeRaytheon 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.
Claims11
A hierarchically structured anodized film for an aluminum substrate, comprising:
- a stepped growth Tartaric-Sulfuric Acid (TSA) film layer comprising a tartaric acid, a sulfuric acid and an aluminum oxide, wherein the stepped growth TSA film is a porous film comprising alternating TSA layers of a first layer having a first density and a second layer having a second density different from the first density;
- and
- further comprising a phosphoric acid anodizing (PAA) film layer on said stepped growth TSA film layer, wherein said phosphoric acid anodizing (PAA) film layer is a porous oxide layer comprising phosphate and aluminum oxide.
Dependencies are inferred from the claim text.