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Method for anticorrosion-treating aluminum or aluminum alloy

A processing method and technology of aluminum alloy, applied in the direction of metal material coating process, anodization, etc., can solve the problems of corrosion resistance gas emission characteristics, many film defects, etc., and achieve excellent corrosion resistance and gas emission characteristics. Effect

Active Publication Date: 2010-05-19
ULVAC INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, as disclosed in Patent Document 1, after degreasing the A1050 alloy, the A5052 alloy, and the A6061 alloy with a weakly alkaline degreasing solution, the deposits are removed in an aqueous solution of nitric acid. Ammonium acid was used for barrier anodic oxidation treatment. When the morphology of the formed barrier anodic oxidation film was observed with a scanning electron microscope, although a relatively continuous film was formed on the A1050 alloy, the A5052 alloy and A6061 alloy formed on the A5052 alloy. There are many film defects, and there are problems in corrosion resistance and gas release characteristics in a vacuum atmosphere

Method used

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  • Method for anticorrosion-treating aluminum or aluminum alloy
  • Method for anticorrosion-treating aluminum or aluminum alloy
  • Method for anticorrosion-treating aluminum or aluminum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A disk made of an A5052 alloy with a diameter of 45 mm and a thickness of 3 mm was prepared as the object to be processed, the surface of which was cut by a lathe. This to-be-processed object was immersed in the 85 degreeC solution containing 80 weight% of phosphoric acid and 3 weight% of nitric acid, and it oxidized for 2 minutes, stirring. Next, the object to be treated was dipped in pure water, and dipped in pure water and washed again.

[0027] Then, the object to be treated was immersed in a 10% by weight ammonium adipate solution at 40° C., and a barrier-type anodic oxide film was formed at a DC voltage of 200 V for 1 hour.

Embodiment 2

[0029] The same treatment object as in Example 1 was prepared.

[0030] This to-be-processed object was immersed in the 85 degreeC solution containing 80 weight% of phosphoric acid and 3 weight% of nitric acid, and it oxidized for 2 minutes, stirring.

[0031] Next, the object to be treated was immersed in pure water, immersed in pure water at 50° C., and washed by immersion in pure water again.

[0032] The washed object is decompressed to 10 in the vacuum device -4 At about Pa, heat at 300°C for 30 minutes, then cool to room temperature (about 10°C-40°C, the same applies below), take it out in the air, and immerse it in a 40°C solution containing 10% by weight of ammonium adipate. , A barrier-type anodic oxide film was formed with a DC voltage of 200V for 1 hour.

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Abstract

Disclosed is a corrosion resistance treatment method for aluminum or an aluminum alloy wherein a barrier-type anodic oxide coating for providing an aluminum or an aluminum alloy with corrosion resistance is formed denser, thereby obtaining excellent gas discharge characteristics. The corrosion resistance treatment method is characterized in that a dense oxide layer having a thickness of 5-20 nm isformed on the surface of aluminum or an aluminum alloy, and then the aluminum or aluminum alloy with oxide layer is subjected to a barrier-type anodizing.

Description

technical field [0001] The invention relates to a corrosion-resistant treatment method for aluminum or aluminum alloy. Background technique [0002] Conventionally, as a method of subjecting aluminum or an aluminum alloy to anticorrosion treatment, for example, Patent Document 1 discloses a method of subjecting the surface of an aluminum alloy to a barrier-type anodic oxidation treatment followed by a heat degassing treatment. [0003] However, as disclosed in Patent Document 1, after degreasing the A1050 alloy, the A5052 alloy, and the A6061 alloy with a weakly alkaline degreasing solution, the deposits are removed in an aqueous solution of nitric acid. Ammonium acid was used for barrier anodic oxidation treatment. When the morphology of the formed barrier anodic oxidation film was observed with a scanning electron microscope, although a relatively continuous film was formed on the A1050 alloy, the A5052 alloy and A6061 alloy formed on the A5052 alloy. There are many film ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/16C23C22/13
CPCC25D11/04
Inventor 稻吉荣石泽克修野村健齐藤真一山口真奈美
Owner ULVAC INC