Treatment method for improving corrosion resistance of surface of aluminum alloy

A technology of aluminum alloy surface and treatment method, which is applied in the direction of surface reaction electrolytic coating, electrolytic coating, anodic oxidation, etc., can solve problems affecting corrosion resistance, etc., and achieve easy control of the program, improvement of corrosion resistance, and simple sealing process Effect

Active Publication Date: 2017-06-27
STATE DEV & INVESTMENT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to previous studies, although a single hydrolytic sealing method can improve the "self-repair" ability of the MAO film, it cannot completely fill the solution penetration pores in the MAO film, thus affecting its corrosion resistance (Xu Ke, Xiao Shubin, Liu Yanhui, Ruan Guoling.Study on Corrosion Resistance of Aluminum Alloy Micro-arc Oxidation Coating in High Temperature Salt Water[J].Chinese Journal of Corrosion and Protection,2013,33(1):17-22)

Method used

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  • Treatment method for improving corrosion resistance of surface of aluminum alloy
  • Treatment method for improving corrosion resistance of surface of aluminum alloy
  • Treatment method for improving corrosion resistance of surface of aluminum alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The aluminum alloy treated in this example is a commonly used antirust aluminum alloy Al5052, and the size of the sample is 50×25×5 mm. The concrete steps of this embodiment are:

[0026] (1) Surface treatment: Grind with 400#, 600#, 1000# sandpaper in sequence, and decontaminate and degrease the aluminum alloy specimen with distilled water, absolute ethanol, and acetone successively, and air-dry at room temperature for later use;

[0027](2) Micro-arc oxidation electrolyte preparation: 6g sodium silicate, 1g sodium tripolyphosphate, 1g sodium hydroxide, 1g sodium tungstate, 1g disodium edetate, 1g sodium metavanadate, mix and add 1L Distilled water is prepared as an electrolyte;

[0028] (3) Micro-arc oxidation treatment: the aluminum alloy sample in step (1) is used as anode, the stainless steel electrolytic cell is used as negative electrode, and the electrolytic solution prepared by step (2) is mechanically stirred in the electrolytic cell, and the stirrer rotating...

Embodiment 2

[0031] The aluminum alloy treated in this example is a commonly used antirust aluminum alloy Al5052, and the size of the sample is 50×25×5 mm. The concrete steps of this embodiment are:

[0032] (1) Surface treatment: Grind with 400#, 600#, 1000# sandpaper in sequence, and decontaminate and degrease the aluminum alloy specimen with distilled water, absolute ethanol, and acetone successively, and air-dry at room temperature for later use;

[0033] (2) Micro-arc oxidation electrolyte preparation: sodium silicate 10g, sodium tripolyphosphate 3g, sodium hydroxide 2g, sodium tungstate 2g, edetate disodium 2g, sodium metavanadate 1g, mix and add 1L Prepare electrolytic solution in distilled water;

[0034] (3) Micro-arc oxidation treatment: the aluminum alloy sample in step (1) is used as the anode, the stainless steel electrolytic cell is used as the negative electrode, and the electrolytic solution prepared by step (2) is used in the electrolytic cell, and mechanical stirring is ...

Embodiment 3

[0037] The aluminum alloy treated in this example is a commonly used antirust aluminum alloy Al5052, and the size of the sample is 50×25×5 mm. The concrete steps of this embodiment are:

[0038] (1) Surface treatment: Grind with 400#, 600#, 1000# sandpaper in sequence, and decontaminate and degrease the aluminum alloy specimen with distilled water, absolute ethanol, and acetone successively, and air-dry at room temperature for later use;

[0039] (2) Micro-arc oxidation electrolyte preparation: sodium silicate 10g, sodium tripolyphosphate 5g, sodium hydroxide 2g, sodium tungstate 3g, edetate disodium 2g, sodium metavanadate 1g, mix and add 1L Prepare electrolytic solution in distilled water;

[0040] (3) Micro-arc oxidation treatment: the aluminum alloy sample in step (1) is used as the anode, the stainless steel electrolytic cell is used as the negative electrode, and the electrolytic solution prepared by step (2) is used in the electrolytic cell, and mechanical stirring is ...

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Abstract

The invention belongs to the technical field of aluminum alloy surface corrosion resistance, and in particular, relates to a treatment method for improving corrosion resistance of the surface of an aluminum alloy. Through adjustment of an electrolyte ratio and electrolysis process parameters and use of aeration stirring, a formed ceramic oxide film has a more uniform and compact structure; and a titanium-silicon composite sol sealing method is adopted to fill an outer loose layer of the ceramic oxide film so as to further improve the Cl<-> ion infiltration capacity of the film layer. The method is simple, control is easy, the process is stable, and the method is particularly suitable for seawater corrosion resistance protection requirements of aluminum alloys in marine engineering environments.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy surface anti-corrosion technology, in particular to a method for anti-corrosion treatment of aluminum alloy surface. Background technique [0002] As a representative of lightweight structural materials, aluminum can meet the requirements of high speed, energy saving and environmental protection in the fields of modern marine transportation, marine construction, marine energy development and seawater desalination, and its demand in marine engineering is increasing. However, aluminum alloys are prone to local corrosion in seawater environments, which affects the long-term reliable application of aluminum alloy equipment to a certain extent. Micro-arc oxidation (MAO) technology is a new surface treatment technology that has emerged in recent years. It introduces the anodic oxidation working area from the Faraday area to the high-voltage discharge area, and uses the instantaneous high temperat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/24C25D11/06C25D21/10
CPCC25D11/024C25D11/026C25D11/06C25D11/246C25D21/10
Inventor 李雪磊徐克张风友刘艳辉张晓晨吕庆春冯厚军
Owner STATE DEV & INVESTMENT
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