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Anodizing aluminium and alloys thereof

An anodic oxidation and anodic technology, applied in anodic oxidation, transportation and packaging, electrolytic coating, etc., can solve the limitation of the thickness of the second type of oxide layer, it is not easy to dye and polish, and the hardness of the oxide layer is not enough to be used as a decoration. Application and other issues

Inactive Publication Date: 2008-11-05
DURACOUCHE INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Type III anodizing processes generally produce a hard and opaque oxide layer that makes them less susceptible to staining and polishing processes
Additionally, the oxide layer produced by the Type II anodizing process may not be sufficiently hard and / or shiny for decorative applications
In addition, the second type anodic oxide layer may dissolve in the aggressive anodizing water bath, so that the thickness of the second type anodic oxide layer is limited

Method used

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  • Anodizing aluminium and alloys thereof
  • Anodizing aluminium and alloys thereof
  • Anodizing aluminium and alloys thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Example 1 was prepared according to the following steps: anodizing aluminum alloy Al-6063 in an electrolyte solution containing water, sulfuric acid (180 g / liter electrolyte) and oxalic acid (16 g / liter electrolyte) at a temperature of about 10-16° C. artifact. The anodizing process is done sequentially in four steps, each step including a different current density and electrolysis time. The current density of the first step is 0-0.7A / dm 2 , for 10 minutes. The current density of the second step is about 0.7-2.0A / dm 2 , for 10 minutes. The current density of the third step is about 2.0-2.5A / dm 2 , for 10 minutes. The current density of the fourth step is about 1.5-2.5A / dm 2 , for 50 minutes. The current density is generated by a pulsed direct current (DC) having a voltage of about 20-24V. The first, second, and third pulse current sequences are 0.8 seconds on and 0.2 seconds off. The fourth pulsed current sequence was 0.6 seconds on followed by 0.4 seconds off....

Embodiment 2

[0091] Example 2 was prepared according to steps similar to Example 1, except that the workpiece was dyed blue.

Embodiment 3

[0092] Example 3 is prepared according to the steps similar to Example 1, except that the workpiece is dyed red.

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Abstract

This invention encompasses methods of producing a colored oxide layer on an aluminum material by anodizing the aluminum material in an electrolyte comprising water, sulfuric acid and oxalic acid. The anodizing step comprises passing at least two sequential current densities through the electrolyte. Methods of making and using article with a colored oxide layer on an aluminum material make by the methods disclosed herein are also disclosed.

Description

technical field [0001] The invention includes a method of producing a colored oxide layer on an aluminum material. In particular, the invention includes a method of anodizing an aluminum material in an electrolyte containing sulfuric acid and oxalic acid to produce a colored oxide layer. Background technique [0002] Aluminum and its alloys are known to have many useful properties, such as light weight, high strength, durability and casting elasticity. In 1889, Alcoa, Inc. was granted a US patent (ie, US Patent No. 400,664) for an electrolytic process for producing aluminum from alumina, which significantly reduced the cost of manufacturing aluminum. Since then, aluminum and its alloys have been widely used in many industries, such as aviation, transportation, construction, semiconductors, and electronics, due to various beneficial properties and low prices. Globally, therefore, aluminum use exceeds that of any metal other than iron, both in volume and value. [0003] Som...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/10
CPCC25D11/024C25D11/08Y10T428/12Y10T428/12993C25D11/04
Inventor 吴福照李树忠
Owner DURACOUCHE INT
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