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Method for preparing magnesium alloy with micro-arc oxidation ceramic membrane

A micro-arc oxidation and magnesium alloy technology, applied in the direction of anodic oxidation, can solve the problems that the micro-arc discharge cannot be carried out smoothly, the dense crystalline MgO cannot be obtained, the color of the yellow ceramic film is light, etc. Simple preparation method and smooth surface effect

Active Publication Date: 2014-03-05
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The color of the yellow ceramic membrane prepared by the above method is too light, the thickness of the membrane is too thin, and the compactness is not good enough
Because the acidic pH of the electrolyte inhibits the formation of the micro-arc oxidation film, the Mg and O atoms do not have enough time to arrange regularly in the acidic environment during the film formation process, so that a dense crystal state cannot be obtained. MgO
Moreover, the dissolution rate of the passivation film is very fast under acidic conditions, so that the micro-arc discharge cannot be carried out smoothly.

Method used

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Embodiment 1

[0023] refer to figure 1 , the present invention is a magnesium alloy with a yellow micro-arc oxidation ceramic film on the surface, which is composed of a magnesium alloy substrate 1 and a yellow ceramic film 2 coated on the surface of the magnesium alloy substrate 1 .

[0024] Magnesium alloy substrate: AZ31B magnesium alloy is used, and the size is 30mm×20mm×3mm.

[0025] The preparation method of the present invention is:

[0026] (1) Prepare the electrolyte: weigh 20g / L of sodium metaaluminate, 1g / L of sodium hydroxide, 2g / L of disodium edetate, 15ml of hydrogen peroxide and 1g / L of potassium permanganate, and use a glass Stir with a rod to make it fully dissolved, and the pH value of the electrolyte is 10.0;

[0027] (2) Grinding, cleaning and drying the surface of the magnesium alloy substrate;

[0028] (3) Micro-arc oxidation: the magnesium alloy is used as the anode, and the stainless steel sheet is used as the cathode, and is completely immersed in the...

Embodiment 2

[0032] Preparation of a magnesium alloy with a yellow micro-arc oxidation ceramic film on the surface, the magnesium alloy substrate: AZ31B type magnesium alloy is used, and the size is 30mm×20mm×3mm.

[0033] Prepare electrolyte: weigh 25g / L of sodium metaaluminate, 1.5g / L of sodium hydroxide, 3g / L of disodium edetate, 15ml of hydrogen peroxide and 2g / L of potassium permanganate, stir with a glass rod Make it fully dissolved, the pH value of the electrolyte is 10.0; the micro-arc oxidation time is 30min, and the current density is 12A / dm 2 , the rest of the method is the same as in Example 1, the thickness of the prepared ceramic film is 25.7 μm, and the microhardness is 1550HV.

Embodiment 3

[0035] Preparation of a magnesium alloy with a yellow micro-arc oxidation ceramic film on the surface. The magnesium alloy substrate: AZ31B type magnesium alloy is used, and the size is 25mm×15mm×2mm.

[0036] Prepare electrolyte: weigh 40g / L of sodium metaaluminate, 3g / L of sodium hydroxide, 3.5g / L of disodium edetate, 10ml of hydrogen peroxide and 3g / L of potassium permanganate, stir with a glass rod Make it fully dissolved, the pH value of the electrolyte is 10.0; the micro-arc oxidation time is 30min, and the current density is 8A / dm 2 , the rest of the method is the same as in Example 1, the thickness of the prepared ceramic film is 21.1 μm, and the microhardness is 1500HV.

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Abstract

The invention discloses a method for preparing a magnesium alloy with a micro-arc oxidation ceramic membrane, mainly solving the problem that in the prior art, the membrane is single in variety, and the conventional membrane layers are generally red, black, green and the like in color. According to the method, an alkali electrolyte is prepared by taking sodium metaaluminate, sodium hydroxide, ethylenediamine tetraacetic acid, potassium permanganate and hydrogen peroxide as electrolyte solutes, and using diionized water as a solvent, and the alkali electrolyte is subjected to micro-arc oxidation treatment so as to obtain the magnesium alloy with a yellow micro-arc oxidation ceramic membrane. The method disclosed by the invention is simple in preparation, low in cost, wide in application range and applicable to light metal. The prepared yellow ceramic membrane has the advantages of uniform color, smooth surface, good compactness, high wearing resistance, good corrosion resistance, good stability and the like, and is particularly applicable to danger warning and reminding on yellow labels on traffic signs.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy surface treatment, in particular to a method for preparing a magnesium alloy micro-arc oxidation yellow ceramic film. Background technique [0002] Magnesium alloy is the lightest metal structure material in practical application. Its density is 1 / 4 of that of steel and 2 / 3 of that of aluminum. It has light specific gravity, high specific strength and specific stiffness, strong damping and shock absorption, and good thermal conductivity. With a series of advantages such as good impact resistance and easy recycling, 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 lightweight metal structure materials, magnesium alloys have some incomparable advantages in the fields of automobile industry, aerospace, weaponry, computers, communication products, and consumer 3C electronic products...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 徐晋勇周逸群赵家臣高成罗奕张应红赵龙阳唐亮高波石小超
Owner GUILIN UNIV OF ELECTRONIC TECH
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