Process for surface treating aluminum and aluminum alloy articles

a technology of aluminum alloy and surface treatment, which is applied in the direction of electrolysis coating, surface reaction electrolytic coating, coating, etc., can solve the problems of high cost of shielding and difficulty in achieving precise and three-dimensional decorative patterns

Inactive Publication Date: 2010-03-04
SHENZHEN FUTAIHONG PRECISION IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]In a fourth step, the substrate is colored in a first dyeing process. Two alternative methods, i.e., chemical staining and adsorption staining may be used. Adsorption staining is implemented in this embodiment to color the first oxide coating. The first oxide coating presents a first color by this process.

Problems solved by technology

However, the cost for providing the shielding is high.
Moreover, it is difficult to achieve a precise and three-dimensional decorative pattern by this shielding.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006]An exemplary process for surface treating aluminum and aluminum alloy articles may include at least the following steps.

[0007]In a first step, an aluminum or aluminum alloy substrate is provided. The substrate includes an internal surface and an external surface.

[0008]In a second step, a first surface appearance of the external surface is formed by a first machining process. For example, the external surface may be sandblasted to achieve a dull surface appearance.

[0009]In a third step, the substrate is processed in a first anodizing process. The first anodizing process is carried out by dipping the substrate in an electrolytic bath containing sulfuric acid at a temperature of about 19-21° C., using a direct current in an approximate range from about 10 to 12 volts for about 45 to 55 minutes. The mass concentration of the sulfuric acid can be about 180 to 220 g / L (gram per liter), and is selected to be about 190-210 g / L in this embodiment. Therefore, a first oxide coating is fo...

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Abstract

A process for surface treating aluminum and aluminum alloy articles is provided. The method includes the steps of providing a substrate of aluminum or aluminum alloy material, the substrate having an internal surface and an external surface; machining the external surface of substrate, thereby forming a first surface appearance on the external surface; forming a first oxide coating with a first color on the substrate surface by a first anodizing process; removing at least a portion of the first oxide coating on the internal surface of the substrate to make the substrate electricity conductive; machining the external surface of the substrate, thereby removing at least a portion of the first oxide coating on the external surface and forming a second surface appearance thereon; forming a second oxide coating with a second color on the area of the external surface excluding the first oxide coating by a second anodizing process.

Description

BACKGROUND[0001]1. Technical Field[0002]The present disclosure relates to processes for surface treating aluminum and aluminum alloy articles.[0003]2. Description of Related Art[0004]Due to having many good properties such as light weight and quick heat dissipation, aluminum and aluminum alloy are widely used in making components (such as housings) of electronic devices. Aluminum and aluminum alloy are usually anodized to form an oxide coating thereon to acquire a decorative and wear resistant surface. When forming a multi-colored oxide coating, a typical anodizing and coloring process are repeatedly implemented. After one anodizing process, the subsequently colored area is exposed while the other area is shielded. However, the cost for providing the shielding is high. Moreover, it is difficult to achieve a precise and three-dimensional decorative pattern by this shielding.[0005]Therefore, there is room for improvement within the art.DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C25D5/02C25D11/12C25D11/18
CPCC25D5/02C25D11/04C25D11/246C25D11/16C25D11/18C25D11/12C25D11/022C25D11/243
Inventor TIAN, MINREN, NAI-JUAN
Owner SHENZHEN FUTAIHONG PRECISION IND CO LTD
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