Anodic oxide film and methods for manufacturing same

A technology of anodic oxidation film and production method, applied in the direction of anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., can solve the problem of large energy consumption and achieve high corrosion resistance

Inactive Publication Date: 2014-07-23
SUZUKI MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, this sealing process consumes a lot of energy

Method used

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  • Anodic oxide film and methods for manufacturing same
  • Anodic oxide film and methods for manufacturing same
  • Anodic oxide film and methods for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A test piece of an aluminum alloy die-casting material ADC12 was used. Immerse each test piece as an anode in a 200g / L sulfuric acid bath, and apply a current density of 1.5A / dm 2 DC current for 10 minutes. Thus, an anodized film having a film thickness of 3 μm was formed. After the anodizing treatment, the sealing treatment was carried out by immersing the test piece in a sealing treatment solution containing 0.8 g / L lithium ions, pH 12, and a temperature of 40° C. for 1 minute. Then, the test piece was dried in an oven at 120° C. for 30 minutes. The dried test piece is then heat-treated in an oven at 120-400° C. for 30-300 minutes. The number of microcracks on the anodized film surface of the obtained test piece was measured. In addition, corrosion resistance was evaluated by performing a salt spray test (JIS Z2371) for 240 hours. In order to evaluate the corrosion resistance, the corrosion area ratio was calculated according to the following formula (1):

[006...

Embodiment 2

[0069] Example 2 was carried out in the same manner as Example 1.

Embodiment 3

[0077] A test piece of an aluminum alloy die-casting material ADC12 was used. Immerse each test piece as an anode in a 200g / L sulfuric acid bath, and apply a current density of 1.5A / dm 2 DC current for 10 minutes. Thus, an anodized film having a film thickness of 3 μm was formed. After the anodizing treatment, sealing treatment was performed by immersing the test piece in a sealing treatment solution containing 0.8 g / L lithium ions, pH 12, and temperature 40° C. for 1 minute. Then, the test piece was dried in an oven at 120° C. for 30 minutes. The dried test piece was further heat-treated in an oven at 400° C. for 30 minutes.

[0078] Cross-sectional photographs of the obtained test piece before and after heat treatment were taken by FE-SEM.

[0079] In general, when an anodized film is formed on an aluminum alloy material containing a large amount of silicon such as an aluminum die-casting material, a thick film is formed at a portion with a low silicon content and a high...

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Abstract

The present invention provides an anodic oxide film which is able to maintain a high corrosion resistance, and a method for manufacturing the anodic oxide film. The method for manufacturing the anodic oxide film comprises the steps of: forming an anodic oxide film on a surface of an aluminum or aluminum alloy material, treating a surface of the anodic oxide film by using a lithium ion-containing sealing treatment liquid, and heating the sealing-treated anodic oxide film.

Description

technical field [0001] The present invention relates to an anodized film formed on the surface of aluminum or an aluminum alloy, and a production method of the anodized film. Background technique [0002] In general, anodizing has been used as a method of improving the corrosion resistance of aluminum and aluminum alloys such as aluminum forged materials, aluminum cast materials, and aluminum die-cast materials. Anodizing is a method of forming an oxide film on the surface of aluminum by oxidizing aluminum. However, this oxide film is a porous film, and the porosity is one of the causes of deterioration in corrosion resistance. Therefore, in order to further improve the corrosion resistance, after the anodizing treatment, a sealing treatment is performed to seal the pores. [0003] The hydration sealing treatment, which is one of the generally known sealing treatments, can be classified into the following types: a steam sealing type, in which the sealing of the anodized fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/18
CPCC25D11/08C25D11/246
Inventor 藤田昌弘
Owner SUZUKI MOTOR CORP
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