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Method for preparing magnesium-lithium alloy surface micro-arc oxidation self-assembling super hydrophobic composite coating

A technology of micro-arc oxidation and magnesium-lithium alloy, which is applied in anodic oxidation and other directions to achieve the effect of improving corrosion resistance

Inactive Publication Date: 2013-07-17
三亚哈尔滨工程大学南海创新发展基地
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there are no public reports of organic phosphonic acid self-assembled coatings on magnesium-lithium alloy surface micro-arc oxidation substrates at home and abroad

Method used

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  • Method for preparing magnesium-lithium alloy surface micro-arc oxidation self-assembling super hydrophobic composite coating
  • Method for preparing magnesium-lithium alloy surface micro-arc oxidation self-assembling super hydrophobic composite coating
  • Method for preparing magnesium-lithium alloy surface micro-arc oxidation self-assembling super hydrophobic composite coating

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Experimental program
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Effect test

specific Embodiment approach 1

[0032] (1) Pretreatment

[0033] In order to obtain a film with good adhesion, a series of pre-treatment work must be carried out, such as grinding, surface degreasing and cleaning, ultrasonic cleaning, in order to obtain a clean alloy surface.

[0034] The specific pretreatment process is to grind the sample with 240#, 400#, 1000#, 2000# sandpaper in sequence, immerse in acetone solution for ultrasonic treatment for 10-20 minutes, then rinse with distilled water, dry it, and put it in a desiccator for later use .

[0035] (2) Micro-arc oxidation

[0036] Electrolyte composition: silicate 5-20g / L, sodium hydroxide 2-8g / L, triethanolamine 5-20g / L. Add the weighed medicines into a beaker filled with a certain amount of distilled water in turn, and stir continuously to dissolve it, and finally add distilled water to dilute to the required concentration. Connect the pre-treated magnesium-lithium alloy with an aluminum wire and put it into a stainless steel electrolytic cell as ...

specific Embodiment approach 2

[0039] (1) Pretreatment of magnesium-lithium alloy surface

[0040] The magnesium-lithium alloy substrate is pre-treated by grinding, surface degreasing and cleaning, and ultrasonic cleaning.

[0041] (2) Micro-arc oxidation

[0042] The pretreated magnesium-lithium alloy is placed in the alkaline silicate electrolyte system, and the plasma electrolytic oxidation treatment is carried out by means of DC pulse output; the pulse frequency is 1000-2000Hz, the duty ratio is 5-20%, and the current density is 3- 8A / cm 2 , Processing time 5-10 minutes. The samples after micro-arc oxidation treatment were rinsed with deionized water, dried, and placed in a desiccator for later use.

[0043] (3) Construction of superphobic composite coating

[0044] Soak the micro-arc oxidation film in ethylene glycol solution, rinse it with deionized water and ethanol successively after taking it out, place it in an oven to dry, and cool it at room temperature. Then put it into the self-assembly s...

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Abstract

The invention provides a method for preparing a magnesium-lithium alloy surface micro-arc oxidation self-assembling super hydrophobic composite coating. The method includes: placing magnesium-lithium alloy in a stainless steel electrolytic cell, and using the magnesium-lithium alloy as anode and the stainless steel electrolytic cell as cathode, treating in a constant-current micro-arc oxidation mode for 5-10 minutes to form a micro-arc oxidation film of the magnesium-lithium alloy; and soaking the treated magnesium-lithium alloy in self-assembling solution for 6-72 hours to build the super hydrophobic composite coating. A self-assembling method is used for assembling amphiphilic organic phosphonic acid molecules on the surface of the micro-oxidation film so as to form a compact and sequential organic molecule layer and the super hydrophobic composite coating on the surface of the magnesium-lithium alloy. By the super hydrophobic composite coating, surface corrosion resistance of the magnesium-lithium alloy is improved greatly while excellent performance of the micro-arc oxidation film is kept.

Description

technical field [0001] The invention relates to a surface treatment method for a magnesium-lithium alloy, in particular to a preparation method for a super-repellent composite coating on the surface of a magnesium-lithium alloy. Background technique [0002] Magnesium-lithium alloy is a new type of lightweight alloy material. With the increase of lithium content, the structure of magnesium-lithium alloy will change from close-packed hexagonal and body-centered hexagonal coexistence to body-centered hexagonal, which not only reduces the density of magnesium alloys , and improve the ductility and plasticity of the alloy. Magnesium-lithium alloys have high specific stiffness and specific strength, excellent vibration damping performance and strong resistance to high-energy particle penetration, and have broad application prospects in aviation, aerospace, automobiles, electronics, communications and other fields. The current bottleneck limiting the application of magnesium-lith...

Claims

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Application Information

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IPC IPC(8): C25D11/30C25D11/34
Inventor 袁艺李智君景晓燕张密林
Owner 三亚哈尔滨工程大学南海创新发展基地
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