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Preparation of magnesium alloy surface high corrosion resistance differential arc oxidation compound film

A micro-arc oxidation and magnesium alloy technology, applied in the direction of anodization, can solve the problems of high corrosion resistance and low voids, and achieve the effects of simple preparation process, smooth surface and stable process

Inactive Publication Date: 2009-07-01
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the above-mentioned shortcomings of the post-treatment sealing process of the existing magnesium alloy micro-arc oxidation film layer, the purpose of the present invention is to propose a one-step in-situ sealing process in the magnesium alloy micro-arc oxidation process, thereby obtaining Micro-arc oxidation composite ceramic membrane with low porosity and high corrosion resistance

Method used

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  • Preparation of magnesium alloy surface high corrosion resistance differential arc oxidation compound film
  • Preparation of magnesium alloy surface high corrosion resistance differential arc oxidation compound film
  • Preparation of magnesium alloy surface high corrosion resistance differential arc oxidation compound film

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The processed sample is a die-cast AM60B magnesium alloy with a size of 20mm×36mm×2mm flakes. The specific operation steps are as follows:

[0023] 1. Sample pretreatment: use 500~1000# water sandpaper to polish the surface of the sample to its roughness R a ≈0.18μm. Use ordinary detergent to clean the surface of the polished sample to remove oil stains, and then rinse with distilled water.

[0024] 3. Compound electrolyte preparation: the in-situ sealing agent used is TiO 2 Sol, TiO 2 The preparation process of the sol is as follows: According to the volume ratio relationship of ethanol: tetrabutyl titanate: triethanolamine: water = 12:3:1:1, a certain amount of tetrabutyl titanate is dropped into absolute ethanol while stirring, Stir for 15 minutes, then add triethanolamine while stirring, stir for 5 minutes, and finally add deionized water under stirring conditions. After stirring for 1 hour, let it stand at room temperature and aging for 24 hours to obtain light yellow ...

Embodiment 2

[0029] The processed sample is a die-cast AM60B magnesium alloy with a block size of 30mm×13.5mm×10mm. Use 500~1000# water sandpaper to polish the surface of the sample to its roughness R a ≈0.18μm, then the cleaning agent will clean the surface of the polished sample, and finally rinse with distilled water for later use.

[0030] The difference from Example 1 is:

[0031] Put the cleaned sample into 10g / L Na 3 PO 4 In the basic electrolyte of 1.0g / L KOH, the control current density is 6.0A / dm 2 Start the micro-arc oxidation under the conditions, and after the oxidation is carried out for 1-2 minutes, add the prepared TiO dropwise to the basic electrolyte while stirring. 2 Sol, until its volume fraction reaches 4vol% of the electrolyte. TiO 2 The dropping process of the sol was completed within 10 minutes, and the entire oxidation time was 30 minutes. After the oxidation treatment is completed, an oxide film with a thickness of about 42 μm is obtained. The test results show that t...

Embodiment 3

[0033] The processed sample is a die-cast AM60B magnesium alloy with a sheet shape of 20mm×36mm×2mm. The basic electrolyte is 10g / L Na 2 SiO 3 And 1.0g / L KOH, add 5vol% and 10vol% TiO in the basic electrolyte 2 Sol and stir well. During the oxidation process, the current density is constant at 6.0A / dm 2 , The oxidation time is 30min, and the rest of the operation is the same as in Example 1.

[0034] Add 5vol% and 10vol% TiO in the basic electrolyte respectively 2 After sol, the thickness of the micro-arc oxide film obtained is 48 μm and 46 μm, the surface is uniform and smooth, and the colors are blue and dark blue, respectively. And under the same oxidation conditions without adding TiO 2 The sample is subjected to micro-arc oxidation treatment in the silicate basic electrolyte of the sol, the oxidation time is 30 minutes, and the thickness of the resulting oxide film is about 37 μm. The test results show that the TiO in the above basic electrolyte 2 The addition of sol realizes...

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Abstract

The invention discloses a method for preparing a microarc oxidation composite film with high corrosion resisting surface of magnesium alloy. The method utilizes the absorption and the mechanical capture effect of micropores of TiO2 sol particles in a microarc oxidation film and the instantaneous high temperature and high pressure produced by arc discharge in the microarc oxidation process to calcine and solidify the TiO2 sol particles to finally realize in-situ hole sealing effect and obtain the compact microarc oxidation composite film by introducing the prior process for preparing nano-particles, namely sol-gel into the microarc oxidation treatment on the surface of the magnesium alloy, and directly adding TiO2 sol into a microarc oxidation electrolyte.

Description

Technical field [0001] The invention belongs to magnesium alloy surface treatment technology, and specifically relates to a method for preparing a ceramic composite film with low voids, high corrosion resistance and diversified colors by performing micro-arc oxidation and in-situ sealing composite technology on the surface of the magnesium alloy. Background technique [0002] Magnesium alloy is the lightest metal structural material in practical applications (its density is 1 / 4 of steel and 2 / 3 of aluminum). It has light specific gravity, high specific strength and specific rigidity, strong damping and shock absorption, and good thermal conductivity. , Good impact resistance, strong electromagnetic shielding ability, easy to recycle and other advantages, it is known as the "green engineering material with the most development potential in the 21st century". As a new generation of green, high-strength, and light-weight metal structural materials, magnesium alloys have some unmatch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
Inventor 薛群基王立平梁军
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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