AM60 magnesium alloy surface heavy-layer treatment method

A treatment method and surface treatment technology, applied in the field of AM60 magnesium alloy surface thick layer treatment, can solve the problems of no protection, loose protective layer, pilling, etc., to improve sintering effect, increase the maximum thickness, and enhance sintering effect 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

[0003] AM60 magnesium alloy is a magnesium alloy containing 6wt% aluminum and 0.27wt% manganese. Under the treatment conditions disclosed in the CN1900383A patent method, the surface of AM60 magnesium alloy can be grown in situ with a thickness of 15-30 μm and a microstructure within 80-110 seconds. Uniform and complete protective layer, however, the CN1900383A patent method is used to form a thick layer with a thickness of more than 30 μm on the surface of AM60 magnesium alloy, and there is a relatively serious phenomenon of sandification, that is, the protective layer becomes loose and pilling. The phenomenon that the thick layer on the surface of the magnesium alloy has 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 AM60 magnesium alloy by the CN1900383A patent method is 30 μm

Method used

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  • AM60 magnesium alloy surface heavy-layer treatment method
  • AM60 magnesium alloy surface heavy-layer treatment method
  • AM60 magnesium alloy surface heavy-layer treatment method

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0016] Embodiment 1, under the conditions of potassium fluoride concentration of 406g / L, potassium hydroxide concentration of 188g / L, power frequency AC voltage of 114V, and oxygen injection rate of 0.01L / s per liter of treatment liquid, AC plasma micro After 119 seconds of arc oxidation surface treatment, a dense and uniform thick protective layer with a thickness of 55 μm can be formed on the surface of AM60 magnesium alloy workpiece.

Embodiment approach 2

[0017] Embodiment 2, under the conditions of potassium fluoride concentration of 406g / L, potassium hydroxide concentration of 188g / L, power frequency AC voltage of 116V, and oxygen injection rate of 0.01L / s per liter of treatment liquid, AC plasma micro After 119 seconds of arc oxidation surface treatment, a 58 μm thick and uniform protective layer can be formed on the surface of AM60 magnesium alloy workpiece.

Embodiment approach 3

[0018] Embodiment 3, under the conditions of potassium fluoride concentration of 408g / L, potassium hydroxide concentration of 188g / L, power frequency AC voltage of 114V, and oxygen injection rate of 0.016L / s per liter of treatment liquid, AC plasma micro After 149 seconds of arc oxidation surface treatment, a dense and uniform thick protective layer with a thickness of 62 μm can be formed on the surface of AM60 magnesium alloy workpiece.

[0019] Embodiment 4, under the condition that the concentration of potassium fluoride is 408g / L, the concentration of potassium hydroxide is 190g / L, the power frequency AC voltage is 116V, and the injection rate of oxygen per liter of treatment liquid is 0.016L / s, the AC plasma micro After 149 seconds of arc oxidation surface treatment, a dense and uniform protective layer with a thickness of 65 μm can be formed on the surface of AM60 magnesium alloy workpiece.

[0020] Embodiment 5, under the conditions of potassium fluoride concentration o...

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Abstract

The invention discloses an AM60 magnesium alloy surface heavy-layer treatment method, belonging to the research field of AM60 magnesium alloy surface heavy-layer treatment. On the basis of alternating current plasma microarc oxidation treatment method, oxygen gas is sprayed into treatment solution to enhance and improve the sintering effect on a protective layer, and the AM60 magnesium alloy is subjected to alternating current plasma microarc oxidation treatment for 119-149 seconds in the following conditions: potassium fluoride concentration is 406-408 g/L, potassium hydroxide concentration is 188-190 g/L, power frequency alternating voltage is 114-116 V, amount of oxygen gas sprayed per liter treatment solution is 0.01-0.016 L/s, thereby forming an uniform thick protective layer with thickness of 55-65 mum and compact texture on the surface of AM60 magnesium alloy.

Description

technical field [0001] The invention relates to a thick layer treatment method on the surface of AM60 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 potassium hydrox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
Inventor 张鹏杜云慧刘汉武
Owner BEIJING JIAOTONG UNIV
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