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Surface superhydrophobic treatment of aluminum materials based on micro-arc oxidation

A technology of micro-arc oxidation and treatment process, which is applied in the direction of anodic oxidation, surface reaction electrolytic coating, electrolytic coating, etc. It can solve the problems of easy damage, affecting surface hydrophobicity, unstable microcosmic rough structure, etc., and achieve excellent mechanical and mechanical properties. The effect of wear resistance

Active Publication Date: 2016-06-29
四川铭帝铝业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101982560A discloses a method for treating the superhydrophobic surface of aluminum alloy. This method requires the use of strong acid solution to corrode the aluminum alloy, and the microscopic rough structure formed on the surface is unstable and prone to damage, thereby affecting the hydrophobicity of the surface.

Method used

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  • Surface superhydrophobic treatment of aluminum materials based on micro-arc oxidation
  • Surface superhydrophobic treatment of aluminum materials based on micro-arc oxidation

Examples

Experimental program
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Effect test

Embodiment 1

[0019] (1) Take the aluminum sample (100mm*10mm*5mm), and use 400# and 800# sandpaper for surface polishing treatment respectively, after polishing, clean it with water ultrasonically, and dry it;

[0020] (2) Fix the polished sample into the electrolytic cell by a conductive fixture, and perform micro-arc oxidation treatment on the aluminum wire for 15 minutes at a constant voltage of 350V. The electrolyte consists of 0.5g / L sodium hydroxide, 10g / L L sodium silicate and 3g / L sodium tungstate, and the balance is water;

[0021] (3) The sample after micro-arc oxidation treatment was washed with water and dried in a 90°C drying oven;

[0022] (4) The surface of the sample after micro-arc oxidation treatment was modified with low surface energy by using ethanol solution with a mass concentration of 2% stearic acid. The treatment time was 15 minutes. Finally, the sample was taken out and dried in a 90°C drying oven. Carry out microstructural analysis to present embodiment sample ...

Embodiment 2

[0024] The process steps are the same as in Example 1, and the difference from Example 1 is that the electrolyte is prepared from 2g / L sodium hydroxide, 15g / L sodium silicate and 1g / L sodium tungstate, and the balance is water. 260V constant voltage condition for 30min. After the micro-arc oxidation treatment, the ethanol solution with a mass concentration of 1% stearic acid was used for 20 min.

Embodiment 3

[0026] The process steps are the same as in Example 1, and the difference from Example 1 is that the electrolyte is prepared from 3g / L sodium hydroxide, 5g / L sodium silicate and 5g / L sodium tungstate, and the balance is water. 400V constant voltage condition for 10min. After the micro-arc oxidation treatment, the ethanol solution with a mass concentration of 5% stearic acid was used for 10 min.

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Abstract

The invention discloses a microarc oxidation-based surface super-hydrophobicity treatment technology for an aluminium material. The technology comprises the following steps: (1) cutting out a segment of an aluminium sample and performing surface polishing treatment on the segment of the aluminium sample; (2) fixing the polished sample through a conductive clamp and placing the fixed polished sample into a microarc oxidation electrolytic bath, and performing microarc oxidation treatment on an aluminium conducting wire under the constant-current or constant-voltage condition; (3) cleaning the sample subjected to microarc oxidation treatment with water and drying; (4) adopting an alcohol solution of stearic acid with the mass concentration of 1%-5% to conduct low-surface-energy modification on the surface of the sample subjected to microarc oxidation treatment, finally taking out the sample and drying. According to the invention, the microarc oxidation technology is adopted to form an oxide ceramic layer microrough structure on the surface of the aluminium material, so that excellent mechanical and wear-resisting properties are achieved, the probability of degradation is low and the super-hydrophobicity is more excellent.

Description

technical field [0001] The invention relates to a method for treating the surface of a material, in particular to a method for treating the superhydrophobicity of the surface of an aluminum material. Background technique [0002] Due to its light weight, high specific strength, corrosion resistance, and easy processing, aluminum materials are widely used in power grids, construction, aviation and other fields, and are one of the most widely used engineering materials. Inspired by surfaces with special wettability such as lotus leaves in nature, superhydrophobic surfaces have become a research hotspot at home and abroad in recent years. The superhydrophobic surface refers to the surface with a static contact angle of more than 150° between the surface and the water droplet. The water droplet is approximately spherical on the surface, and the contact area is small, so it is easy to roll off. Due to the ability of superhydrophobic surfaces to repel the adhesion of water drople...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/04C25D11/18
Inventor 金海云黄振牛瑞冬晋普高乃奎
Owner 四川铭帝铝业有限公司