Method for producing white anodized aluminum oxide

Anodized aluminum, anodized technology, applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problem of destroying the internal structure of AAO, reducing the final hardness, etc., to achieve low cost, effective cost, high color The effect of intensity

Inactive Publication Date: 2012-12-19
NANO & ADVANCED MATERIALS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, F - The ions disrupt the internal structure of the AAO and thus considerably reduce the final hardness

Method used

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Examples

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Embodiment Construction

[0018] The method of the present invention produces white anodized aluminum oxide through commercial scale processing steps that allow white AAO to be produced on an industrial scale. This disclosure will describe several exemplary embodiments of the invention.

[0019] The invention is practiced on the surface of aluminum or aluminum alloy substrates; these aluminum / aluminum alloy substrates can be formed into a variety of shapes based on the end use. Before anodizing, the aluminum / aluminum alloy substrate is decontaminated by acidic or alkaline solutions and detergents to degrease, rinsed with distilled water and organic solvents such as ethanol and acetone, and dried. In an exemplary method, an 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 washing with deionized water, the substrates were pickled and deashed in nitric acid. In deashing, non-aluminum metals are removed fr...

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PUM

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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

technical field [0001] The present invention relates to methods of anodizing aluminum to produce anodized aluminum, and more particularly to methods for producing white anodized aluminum. Background technique [0002] Anodized aluminum oxide (AAO) on aluminum / aluminum alloys is widely used as a decorative finish due to its excellent hardness, corrosion resistance and wear resistance. Since the anodized aluminum layer can be colored by dyes or pigments, it is already used in products such as automotive hardware and accessories, furniture, building materials, electronics and accessories. [0003] AAO is formed by anodizing aluminum or aluminum alloy in inorganic acid or organic acid. Sulfuric acid, oxalic acid, phosphoric acid and chromic acid are commonly used as electrolytes in the anodizing process. By adjusting anodic oxidation parameters such as acid concentration, voltage, current density, temperature and time, the pore size of the obtained oxide layer can be controlle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/14C25D11/04C25D11/02
CPCC25D11/243C25D11/14C25D11/04
Inventor 缪建英林婉婷区汉威梁营严敏何
Owner NANO & ADVANCED MATERIALS INST
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