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ZrO2/MgO wear-resistant film layer on magnesium alloy and preparation method thereof

A magnesium alloy, wear-resistant film technology, applied in the direction of coating, surface reaction electrolytic coating, anodizing, etc., can solve the problem of poor adhesion between the micro-arc oxidation film layer and the substrate, so as to improve easy cracking and promote surface densification. The effect of preventing microporous loosening

Active Publication Date: 2021-07-09
西安赛福斯材料防护有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of poor bonding between the existing micro-arc oxidation film and the substrate, and to provide a ZrO coating on a magnesium alloy. 2 / MgO wear-resistant film layer and preparation method thereof

Method used

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  • ZrO2/MgO wear-resistant film layer on magnesium alloy and preparation method thereof
  • ZrO2/MgO wear-resistant film layer on magnesium alloy and preparation method thereof
  • ZrO2/MgO wear-resistant film layer on magnesium alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Add 2g of ammonium bifluoride, 4g of sodium dihydrogen phosphate, 3g of potassium fluorozirconate and 2.5g of potassium hydroxide into 1L of deionized water to obtain an electrolyte, and place the AZ91 magnesium alloy in the electrolyte for micro-arc oxidation treatment;

[0035] The process of micro-arc oxidation is:

[0036] The micro-arc oxidation voltage is cyclically pressurized from 180V to 400V, and the surface of the film layer is pressurized by 5-10V each time it is close to the arc-extinguishing state. After the arc is started, the reaction lasts for 15 minutes, and then the voltage is reduced to zero, and the power is turned off;

[0037] After the micro-arc oxidation is completed, the AZ91 magnesium alloy is rapidly cooled in the cooling liquid, and ZrO is formed in situ on the magnesium alloy after cooling. 2 / MgO wear-resistant film layer.

[0038] see figure 2 , figure 2 It is the SEM figure of the membrane layer of embodiment 1, and wherein, (a) is ...

Embodiment 2

[0040] Add 2g of ammonium bifluoride, 1g of potassium fluozirconate, 4g of sodium dihydrogen phosphate and 2.5g of potassium hydroxide into 1L of deionized water to obtain an electrolyte, place the magnesium alloy in the electrolyte for micro-arc oxidation treatment, and then place it in the cooling liquid Rapid cooling for in situ generation of ZrO on magnesium alloys 2 / MgO wear-resistant film layer.

[0041] The micro-arc oxidation process is as follows: the micro-arc oxidation voltage is cyclically pressurized from 180V to 450V, and the surface of the film layer is pressurized by 5-10V each time it is close to the arc-extinguishing state. The reaction lasts for 25 minutes after the arc is started, and then the voltage is reduced to zero, and the power is turned off. ;

Embodiment 3

[0043] Add 2g of ammonium bifluoride, 5g of potassium fluozirconate, 4g of sodium dihydrogen phosphate and 2.5g of potassium hydroxide into 1L of deionized water to obtain an electrolyte. The magnesium alloy is placed in the electrolyte for micro-arc oxidation treatment, followed by rapid cooling. In Situ Generation of ZrO on Magnesium Alloys 2 / MgO wear-resistant film layer.

[0044] The micro-arc oxidation process is as follows: the micro-arc oxidation voltage is 180V cyclically pressurized to 400V, each time the surface of the film layer is close to the arc-extinguishing state, pressurize 5-10V, the reaction lasts for 10 minutes after the arc is started, and then the voltage is reduced to zero, and the power is turned off.

[0045] see Figure 5 , Figure 5 It is the SEM figure of the membrane layer cross-section of embodiment 3, as can be seen from the figure, the potassium fluorozirconate of higher concentration content makes the microporous structure of the prepared zi...

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Abstract

The invention discloses a ZrO2 / MgO wear-resistant film layer on a magnesium alloy and a preparation method thereof, and belongs to the field of composite film layers. According to the preparation method of the ZrO2 / MgO wear-resistant film layer on the magnesium alloy, MgO enters a t-ZrO2 body to form a solid solution through instant high temperature provided by micro-arc discharge, and the t-ZrO2 is stabilized without crystal transformation; after solid solution saturation of MgO in ZrO2, redundant MgO appears in the form of an independent crystal phase, and the MgO, ZrO2 and a melt of a solid solution in a discharge area are rapidly cooled to form a ZrO2 / MgO film layer through rapid cooling; a film layer with a micropore structure grows on the surface of the magnesium alloy in situ through micro-arc discharge, the film layer with the micropore structure and a base body are combined in a metallurgical mode, the micropore film layer grows in situ, and therefore, the binding force of an interface is good.

Description

technical field [0001] The invention belongs to the field of composite films, in particular to ZrO on a magnesium alloy 2 / MgO wear-resistant film layer and preparation method thereof. Background technique [0002] Magnesium alloys have the advantages of high specific stiffness, specific strength, good shock absorption, electromagnetic shielding performance, etc., and are widely used in the defense industry and civilian fields. However, the surface hardness of magnesium alloys is low, resulting in poor surface wear resistance of magnesium alloys, which seriously restricts the scope of application of magnesium alloys. Improving the wear resistance of magnesium alloys by using oxide ceramic film protection treatment is an essential process before magnesium products enter practical applications. [0003] At present, the problem of the preparation technology of the magnesium alloy oxide ceramic film is that the current density distribution will change with the irregular change...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
CPCC25D11/30C25D11/026Y02E30/30
Inventor 陈永楠张震王楠杨泽慧钱伟峰徐义库赵秦阳陈宏郝建民孙志平
Owner 西安赛福斯材料防护有限责任公司
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