Magnesium alloy surface hydrophobization compound processing method

A composite treatment, magnesium alloy technology, applied in the direction of anodic oxidation, etc., can solve the problems of super-hydrophobic surface service life limit, complex process, not ideal, etc., to achieve the effect of smooth and delicate hand feeling, high processing efficiency, dense and orderly growth

Inactive Publication Date: 2010-02-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the Chinese invention patent application number is 200710078089.3, which discloses a method for preparing a superhydrophobic surface of a magnesium alloy. It undergoes micro-arc oxidation treatment to obtain a rough surface, then treats it in acrylic acid, and finally spin-coats vinyl polydimethylsiloxane The surface modification of alkane makes the contact angle greater than 150°. Since the micro-arc oxidation must undergo chemical corrosion follow-up treatment, the process is more complicated, and because the super-hydrophobic surface obtained by the spin coating process relies on physical adsorption or van der Waals force combination. , the lifetime of superhydrophobic surfaces is limited
The Ch...

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  • Magnesium alloy surface hydrophobization compound processing method
  • Magnesium alloy surface hydrophobization compound processing method
  • Magnesium alloy surface hydrophobization compound processing method

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Effect test

Embodiment 1

[0036] The implementation workpiece is Mg-Al-Zn series AZ31 magnesium alloy plate, the size is 50×30×1.5 (mm), and the magnesium alloy surface hydrophobization composite treatment method using the combination of micro-arc oxidation and organic coating technology specifically includes the following steps and processes condition:

[0037] Step 1: Micro-nanoporous superhydrophilic surface prepared by micro-arc oxidation

[0038] (1) Pretreatment of magnesium alloy workpieces

[0039]Grind the AZ31 magnesium alloy workpiece with 120#, 360#, 800# sandpaper, put it in acetone solution and ultrasonically clean it for 10 minutes to remove oil stains, take it out and dry it with cold air for later use;

[0040] (2) Micro-arc oxidation treatment

[0041] The pre-treated magnesium alloy workpiece is used as the working electrode. Both electrodes are working electrodes and film is formed at the same time. The micro-arc oxidation treatment is carried out in the form of AC constant voltag...

Embodiment 2

[0051] The implementation workpiece is Mg-Al-Zn series AZ31 magnesium alloy plate, the size is 50×30×1.5 (mm), and the magnesium alloy surface hydrophobization composite treatment method using the combination of micro-arc oxidation and organic coating technology specifically includes the following steps and processes condition:

[0052] Step 1: Micro-nanoporous superhydrophilic surface prepared by micro-arc oxidation

[0053] (1) Pretreatment of magnesium alloy workpieces

[0054] Grind the AZ31 magnesium alloy workpiece with 120#, 360#, 800# sandpaper, put it in acetone solution and ultrasonically clean it for 10 minutes to remove oil stains, take it out and dry it with cold air for later use;

[0055] (2) Micro-arc oxidation treatment

[0056] The pre-treated magnesium alloy workpiece is used as the working electrode. Both electrodes are working electrodes and film is formed at the same time. The micro-arc oxidation treatment is carried out in the way of alternating curren...

Embodiment 3

[0064] The implementation workpiece is Mg-Al-Zn series AZ31 magnesium alloy plate, the size is 50×30×1.5 (mm), and the magnesium alloy surface hydrophobization composite treatment method using the combination of micro-arc oxidation and organic coating technology specifically includes the following steps and processes condition:

[0065] Step 1: Micro-nanoporous superhydrophilic surface prepared by micro-arc oxidation

[0066] (1) Pretreatment of magnesium alloy workpieces

[0067] Grind the AZ31 magnesium alloy workpiece with 120#, 360#, 800# sandpaper, put it in acetone solution and ultrasonically clean it for 10 minutes to remove oil stains, take it out and dry it with cold air for later use;

[0068] (2) Micro-arc oxidation treatment

[0069] The pre-treated magnesium alloy workpiece is used as the working electrode. Both electrodes are working electrodes and film is formed at the same time. The micro-arc oxidation treatment is carried out in the form of AC constant volta...

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Abstract

The invention discloses a magnesium alloy surface hydrophobization compound processing method combining micro-arc oxidation with an organic film coating technology and comprising the following steps:preparing a micro-nano porous super-hydrophilic surface by the micro-arc oxidation; and carrying out hydrophobization processing of an organic coating film. The invention prepares a micro-nano porouscompound structural film with hydrophobic and super-hydrophobic functions and excellent corrosion resistance; according to actual demand, a static contact angle of the compound structural film and distilled water is controllable within the range from 110 to174 degrees and the thickness of the compound structural film is controllable within the range from 2 to 30 micrometers, the electrokinetic potential polar characteristic, the electrical potential shuffle the corrosion current density of the compound structural film in a 3.5% NaCl solution or 0.1m/LNaCl solution are all reduced by 3 magnitude orders. The invention is suitable for the corrosion, pollution and water prevention of a magnesium alloy workpiece with large area and also suitable for the shell of a light precise magnesium alloyproduct to widen the application field of magnesium alloys and has simple and convenient technology, short period, low cost and easy industrialized production.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy surface modification, in particular to a composite treatment method for magnesium alloy surface hydrophobization by combining micro-arc oxidation and organic coating technology. Background technique [0002] Wettability is an important characteristic of the surface of a material, and hydrophilicity and hydrophobicity are two aspects that characterize the wettability of a material surface, and are important parameters that directly reflect the surface free energy of a material. The change of surface wettability (hydrophilicity and hydrophobicity) of materials can improve the surface properties of materials and expand the application range of materials, which plays an important role in industrial and agricultural production and people's daily life. By achieving hydrophilic-hydrophobic conversion on the surface of magnesium alloys, the preparation of functional films with hydrophobic or super...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 康志新赖晓明刘应辉王芬龙雁邵明李元元
Owner SOUTH CHINA UNIV OF TECH
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