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Method For Producing White Anodized Aluminum Oxide

a technology aluminum oxide, which is applied in the direction of superimposed coating process, cell components, coatings, etc., can solve the problems of toxic pigment groups and limit their use, and achieve the effects of reducing pore size, increasing the opacity of anodized aluminum oxide layer, and enhancing product quality

Inactive Publication Date: 2014-07-31
NANO & ADVANCED MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention describes a simple and cost-effective process for producing a high-quality white AAO with uniform color intensity using a multi-step anodization technique. This method eliminates complicated steps such as pore enlargment and electrolytic deposition of metals / metal compounds. The hardness and other desirable surface properties of the AAO are retained. The method allows for easy post-treatments such as sealing and polishing. A modification to enhance product quality involves removing the first porous aluminum oxide layer and forming a second layer through further anodization. The final anodized layer has a high degree of opacity. The method uses an inexpensive and reproducible process suitable for commercialization.

Problems solved by technology

However, this group of pigments is toxic.
This will limit their usage.

Method used

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Examples

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Embodiment Construction

[0019]The process of the present invention creates white anodized aluminum oxide through commercial grade process steps that permit industrial-scale production of white AAO. The present invention will be described with respect to various exemplary embodiments for carrying out the invention.

[0020]The present invention is carried out on aluminum or aluminum alloy substrate surfaces; these aluminum / aluminum alloy substrates can be formed in a variety of shapes depending upon the final use. Prior to anodization, the aluminum / aluminum alloy substrate is cleaned, typically through degreasing using an acidic or alkaline solution and detergent, followed by thorough rinsing with distilled water and organic solvents such as ethanol and acetone, and drying. In an exemplary process, the Al / Al alloy substrate is washed with a mixture of acetone and ethanol (1:1 v:v). The substrate is then etched by a sodium hydroxide solution. After being washed by DI water, the substrate is pickled and desmutte...

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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.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]The present application is a national phase application of PCT / CN2011 / 071616 filed on Mar. 8, 2011, and the disclosure of which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates to methods for anodizing aluminum to produce aluminum oxide and, more particularly, methods for producing white anodized aluminum oxide.BACKGROUND OF THE INVENTION[0003]Anodized aluminum oxide (AAO) on aluminum / aluminum alloys is widely used as a decorative finished surface due to its excellent hardness, corrosion resistance and abrasion resistance. Because anodized aluminum oxide layer can be colored by dyes or pigments, it has been employed in products such as automotive hardware and accessories, home furnishings, building and architectural materials, electronics, and ornaments.[0004]AAO is formed by the anodization of aluminum or aluminum alloys in inorganic or organic acids. Sulfuric, oxalic, phosphori...

Claims

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Application Information

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IPC IPC(8): C25D11/24
CPCC25D11/243C25D11/04C25D11/14
Inventor MIAO, JIANYINGLAM, UN TENGAU, RICHARD HON WAILIANG, YINGYIM, MAN HO
Owner NANO & ADVANCED MATERIALS INST
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