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US 12,571,121 B2Granted
Surface-treated aluminum material and method for producing the same
AssigneeUacj Corporation
InventorsDaiki Nakajima, Sohei Saito
Life of this patent
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Abstract
The surface-treated aluminum material includes an aluminum material and an oxide film formed on at least part of a surface of the aluminum material, and when a perimeter and an area of a void on a surface of the oxide film are represented by L and S, respectively, an undulation degree of the void defined as L2/S×(¼π) is 2.5 or more.
Claims4
A surface-treated aluminum material comprising an aluminum material and an oxide film formed on at least part of a surface of the aluminum material,
- wherein, when a perimeter and an area of a void on a surface of the oxide film are represented by L and S, respectively, an undulation degree of the void defined as L2/S×(¼×) is 2.5 or more, wherein a diameter of the void is 25 to 65 nm in terms of a circle equivalent diameter,
- the oxide film comprises a barrier anodic oxide film layer formed on at least part of the surface of the aluminum material and an aluminum oxide film layer formed on the barrier anodic oxide film layer,
- the void is located on a surface of the aluminum oxide film layer, and
- the void is a small pore extending from the surface of the aluminum oxide film layer to the inside.
1 more element
Dependencies are inferred from the claim text.