Hole sealing method for aluminum and aluminium alloy anode oxide film

A technology of anodized film and aluminum alloy, which is applied in the field of metal surface treatment, can solve the problems of high energy consumption, no antistatic performance of anodized film, and increased production cost, so as to improve the service life, and the sealing method is simple and easy, The effect of low production cost

Inactive Publication Date: 2012-07-25
史建明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method also needs to work for a long time (15~20min) at high temperature (80°C~85°C), which consumes a lot of energy and increases the production cost.
[0006] In the prior art, since the micropores of the anodized film are sealed without introducing conductive substances, the anodized film of aluminum and aluminum alloy has no antistatic performance.

Method used

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  • Hole sealing method for aluminum and aluminium alloy anode oxide film
  • Hole sealing method for aluminum and aluminium alloy anode oxide film

Examples

Experimental program
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Effect test

Embodiment 1

[0030] In step (1), the anionic surfactant is mixed with the carbon nanotubes to form a mixture. The mass ratio of anionic surfactant to carbon nanotubes in step (1) is 3:1. In this embodiment, the surfactant is sodium dodecylbenzenesulfonate, and the average length of the carbon nanotubes is 5 nm.

[0031] In step (2), the mixture is added with deionized water to form a bath solution 20, and mixed evenly. In this embodiment, the concentration of carbon nanotubes in the bath 20 is 1 g / L.

[0032] Using a dispersing homogenizer (not shown) at a speed of 5000 rpm / min, the bath solution 20 is uniformly mixed for 30 minutes. The purpose of uniformly mixing the bath solution 20 is to further break the long-chain structure of the carbon nanotubes and make them into shorter-chain carbon nanotubes, so that the carbon nanotubes can be fully filled on the surface of aluminum and aluminum alloys. In the micropores (not shown) of the anodized film, thereby improving the sealing effect....

Embodiment 2

[0038] Step (1) The anionic surfactant is mixed with the carbon nanotubes to form a mixture. The mass ratio of anionic surfactant to carbon nanotube in step (1) is 2:1. In this embodiment, the surfactant is sodium dodecylbenzenesulfonate, and the average length of carbon nanotubes is 12 nm.

[0039] Step (2) Add deionized water to the mixture, and stir evenly to form a bath 20, the concentration of carbon nanotubes in the bath 20 is 3.5 g / L.

[0040] Using a dispersing homogenizer (not shown) at a rotational speed of 5000 rpm / min, the bath solution 20 is uniformly mixed for 60 minutes. Of course, an ultrasonic device can also be used to oscillate the bath solution 20 at a frequency of 14 KHz-40 KHz for at least 2 hours. The purpose of uniformly mixing the bath solution 20 is to further break the long-chain structure of the carbon nanotubes and turn them into shorter-chain carbon nanotubes, so that the carbon nanotubes can be fully filled into the anode covered by the surface...

Embodiment 3

[0046] Step (1) The anionic surfactant is mixed with the carbon nanotubes to form a mixture. The mass ratio of anionic surfactant to carbon nanotube in step (1) is 1:1. In this embodiment, the surfactant is sodium dodecylbenzenesulfonate, and the average length of the carbon nanotubes is 20 nm.

[0047] Step (2) Add deionized water to the mixture, and stir evenly to form a bath 20, the concentration of carbon nanotubes in the bath 20 is 5 g / L.

[0048] Using a dispersing homogenizer (not shown) at a speed of 5000 rpm / min, the bath solution 20 is uniformly mixed for 100 minutes. The purpose of uniformly mixing the bath solution 20 is to further break the long-chain structure of the carbon nanotubes and make them into shorter-chain carbon nanotubes, so that the carbon nanotubes can be fully filled into the anode covered by the surface of the aluminum sample 40 In the micropores (not shown) of the oxide film, so as to improve the sealing effect.

[0049] Step (3) The aluminum ...

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Abstract

The invention provides a hole sealing method for an aluminum and aluminium alloy anode oxide film, which comprises the following steps of: (1) mixing anionic surfactant and a carbon nanotube to form a mixture; (2) adding deionized water into the mixture to form bath solution, and mixing uniformly; (3) taking aluminum and / or aluminium alloy with the surface being provided with the anode oxide film as an anode, and a lead plate as a cathode, and putting into the bath solution; and (4) loading an electrical field to the bath solution, wherein the initial voltage of the electrical field is 0-4V, the maximum current density is 0.1A / dm<2>, and the voltage is gradually risen to be 40-70V and is constant for 20-40 min. The hole sealing method for the aluminum and aluminium alloy anode oxide film is simple, convenient and easy to realize, has lower production cost, and longer service life. Simultaneously, the carbon nanotube is introduced in a hole sealing process of the aluminum and aluminium alloy anode oxide film, the surface of the aluminum and aluminium alloy provided with the oxide film has antistatic property.

Description

technical field [0001] The invention relates to a metal surface treatment method, in particular to a hole sealing method on the surface of aluminum and aluminum alloy with anodized film. Background technique [0002] Aluminum is a very active metal. Aluminum and aluminum alloys will naturally form a layer of Al in the air. 2 o 3 The film can protect aluminum and aluminum alloy from further corrosion in neutral or weak acid solution, and play a certain protective role. [0003] The so-called anodic oxidation surface treatment of aluminum and aluminum alloy is a surface treatment method in which the aluminum product is used as an anode in a suitable electrolyte, and an anode current is applied to oxidize the surface to obtain an oxide film. However, the surface of anodized aluminum and aluminum alloy has a honeycomb porous structure. These micropores have strong chemical activity and physical adsorption, and are easy to adsorb corrosive media and pollutants in the atmos...

Claims

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Application Information

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IPC IPC(8): C25D11/18
Inventor史建明
Owner史建明