Hierarchically structured duplex anodized aluminum alloy
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.
1. A component, comprising:
an aluminum alloy substrate;
a stepped growth Tartaric-Sulfuric Acid (TSA) film on the substrate, 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
a phosphoric acid anodizing (PAA) film layer on the stepped growth TSA film.
2. The component as recited in claim 1 , wherein said stepped growth TSA film layer is formed via multiple alternating anodizing voltages.