Method For Producing White Anodized Aluminum Oxide
AssigneeNano and Advanced Materials Institute Limited
InventorsJianying Miao, Un Teng Lam, Richard Hon Wai Au, Ying Liang, Man Ho Yim
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Abstract
A method for forming substantially white anodized aluminum oxide on an aluminum or aluminum alloy substrate is provided. A porous aluminum oxide layer is formed on the aluminum or aluminum alloy substrate by anodization in an acid electrolyte. Following formation of the anodized porous layer of aluminum oxide, the aluminum/aluminum alloy substrate is sequentially immersed in at least two reaction material solutions. The two or more reaction materials react to deposit a substantially white pigment material in the pores of the anodized aluminum oxide.
Claims13
A method for forming a substantially white anodized aluminum oxide layer on an aluminum or aluminum alloy substrate comprising:
- forming a porous aluminum oxide layer on the aluminum or aluminum alloy substrate by anodization in an acidic electrolyte;
- sequentially immersing the aluminum or aluminum alloy substrate with the porous aluminum oxide layer formed thereon in at least first and second reaction material solutions such that the first reaction material solution infiltrates pores of the porous aluminum oxide layer and the second reaction material solution infiltrates the pores of the porous aluminum oxide layer to react at least portions of the first and second reaction material solutions with each other to form one or more substantially white metal compound pigment reaction product deposited in the pores to create an anodized aluminum oxide layer having a substantially white appearance.
Dependencies are inferred from the claim text.