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Method for treating thick layer on surface of AZ91 magnesium alloy

A treatment method and surface treatment technology, applied in the direction of anodic oxidation, etc., can solve the problems of no protective effect, loose protective layer, pilling, etc., and achieve the effect of improving sintering effect, increasing the maximum thickness, and enhancing sintering effect

Inactive Publication Date: 2011-07-20
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thick layer with a thickness of more than 30 μm formed on the surface of the AZ91 magnesium alloy by the CN1900383A patent method has a relatively serious sandification phenomenon, that is, the protective layer becomes loose and pills. There is almost no protective effect on the magnesium alloy substrate, that is to say, the maximum thickness of the protective protective layer formed on the surface of the AZ91 magnesium alloy by the CN1900383A patent method is 30 μm

Method used

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  • Method for treating thick layer on surface of AZ91 magnesium alloy
  • Method for treating thick layer on surface of AZ91 magnesium alloy
  • Method for treating thick layer on surface of AZ91 magnesium alloy

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Experimental program
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Effect test

Embodiment approach 1

[0015] Embodiment 1, under the conditions of potassium fluoride concentration of 262g / L, potassium hydroxide concentration of 93g / L, power frequency AC voltage of 130V, and oxygen injection rate of 0.01L / s per liter of treatment liquid, AC plasma micro After 106 seconds of arc oxidation surface treatment, a dense and uniform protective layer with a thickness of 55 μm can be formed on the surface of the AZ91 magnesium alloy workpiece.

Embodiment approach 2

[0016] Embodiment 2, under the condition that the concentration of potassium fluoride is 262g / L, the concentration of potassium hydroxide is 93g / L, the power frequency AC voltage is 132V, and the injection rate of oxygen per liter of treatment liquid is 0.01L / s, the AC plasma micro After 106 seconds of arc oxidation surface treatment, a dense and uniform protective layer with a thickness of 58 μm can be formed on the surface of the AZ91 magnesium alloy workpiece.

Embodiment approach 3

[0017] Embodiment 3, under the conditions of potassium fluoride concentration of 264g / L, potassium hydroxide concentration of 93g / L, power frequency AC voltage of 130V, and oxygen injection rate of 0.016L / s per liter of treatment liquid, AC plasma micro After 138 seconds of arc oxidation surface treatment, a 62 μm thick and uniform protective layer can be formed on the surface of the AZ91 magnesium alloy workpiece.

[0018] Embodiment 4, under the condition that the concentration of potassium fluoride is 264g / L, the concentration of potassium hydroxide is 95g / L, the AC voltage of power frequency is 132V, and the injection rate of oxygen per liter of treatment liquid is 0.016L / s. After arc oxidation surface treatment for 138 seconds, a dense and uniform protective layer with a thickness of 65 μm can be formed on the surface of the AZ91 magnesium alloy workpiece.

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Abstract

The invention discloses a method for treating a thick layer on the surface of an AZ91 magnesium alloy, and belongs to the field of researches of treating the thick layer on the surface of the AZ91 magnesium alloy. On the basis of an alternating current plasma micro-arc oxidation treatment method, oxygen is injected into treatment solution to enhance and improve a sintering effect on a protective layer, and the AZ91 magnesium alloy is subjected to alternating current plasma micro-arc oxidation treatment for 106 to 138 seconds under the conditions that the concentration of potassium fluoride is 262 to 264g / L, the concentration of potassium hydroxide is 93 to 95g / L, power frequency alternating voltage is 130 to 132V and 0.01 to 0.016L of oxygen is injected into each liter of treatment solution per second, so that a thick protective layer with the thickness of 55 to 65mu m and a compact and uniform structure can be formed on the surface of the AZ91 magnesium alloy.

Description

technical field [0001] The invention relates to a method for treating a thick layer on the surface of an AZ91 magnesium alloy. Background technique [0002] Publication number: CN1900383A, title of invention: "A Surface Treatment Method for AZ91 Magnesium Alloy", expounded the AC plasma micro-arc oxidation treatment method for AZ91 magnesium alloy, that is, using a treatment solution containing potassium fluoride and potassium hydroxide, by The power frequency AC power supply controlled by the voltage regulator provides electric energy. In each power frequency AC voltage cycle, the instantaneous high temperature generated by the plasma micro-arc discharge on the surface of the AZ91 magnesium alloy is generated by using the negative and positive ions in the treatment liquid. Form a protective layer. Using this AC plasma micro-arc oxidation treatment method, the concentration of potassium fluoride disclosed in the patent CN1900383A is 500-979g / L, the concentration of potassiu...

Claims

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Application Information

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IPC IPC(8): C25D11/30
Inventor 杜云慧张鹏刘汉武
Owner BEIJING JIAOTONG UNIV