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AZ91 magnesium alloy surface treating method

An AZ91, surface treatment technology, applied in the field of electrochemical surface treatment of AZ91 magnesium alloy, can solve the problem of long treatment time, and achieve the effect of shortening the surface treatment time

Inactive Publication Date: 2009-12-16
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to overcome the shortcoming of "long processing time" in the existing AZ91 magnesium alloy micro-arc oxidation treatment method, and provide a reasonable AC plasma that can reduce the surface treatment time of AZ91 magnesium alloy to 60-90 seconds Bulk micro-arc oxidation treatment method

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  • AZ91 magnesium alloy surface treating method

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Embodiment Construction

[0007] The specific implementation steps of this AZ91 magnesium alloy surface treatment method:

[0008] Step 1. Connect the power frequency AC power supply to the input end of the voltage regulator, and use two long wires to connect the two pieces of AZ91 magnesium alloy workpieces that have been degreased, polished and cleaned to the output end of the voltage regulator respectively;

[0009] Step 2, mix potassium fluoride, potassium hydroxide and tap water at 40°C according to the following ratio: potassium fluoride 500-979g / L, potassium hydroxide 300-349g / L, to make an alkaline surface treatment solution, Pour into the treatment tank;

[0010] Step 3: Adjust the output voltage of the voltage regulator to 68-80V, place two pieces of AZ91 magnesium alloy workpieces at a distance of 20cm, and simultaneously immerse them in the treatment liquid in the treatment tank for AC plasma micro-arc oxidation treatment. form a ceramic layer;

[0011] Step 4: After 60-90 seconds of trea...

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Abstract

The invention discloses a surface treatment method of AZ91 magnesium alloy. In the field of electrochemical surface treatment of AZ91 magnesium alloy, a power frequency AC power supply with a voltage of 68-80V controlled by a voltage regulator is used to prepare a fluorine-containing AC power supply with tap water. AZ91 magnesium alloy workpiece is subjected to AC plasma micro-arc oxidation treatment for 60 to 90 seconds in an alkaline treatment solution of potassium chloride 500-979g / L and potassium hydroxide 300-349g / L to make the surface of AZ91 magnesium alloy workpiece in situ A milky white ceramic layer with a thickness of 15-30 μm, uniform and complete structure is grown. On the premise of ensuring the surface treatment quality of AZ91 magnesium alloy, the surface treatment time is shortened, and the "treatment time" existing in the existing magnesium alloy micro-arc oxidation treatment method is solved. long" technical issues.

Description

technical field [0001] The invention relates to an electrochemical surface treatment method of AZ91 magnesium alloy. Background technique [0002] Patent No.: 02111521.4, Invention Name: "Magnesium Alloy Surface Composite Ceramic Film and Formation Method", described the AZ91 magnesium alloy anodic micro-arc oxidation surface treatment method, which can be used for 10 minutes of micro-arc surface treatment on AZ91 magnesium alloy A 40μm thick milky white ceramic layer is formed on the surface. For magnesium alloys, the length of time required for surface treatment directly determines production efficiency, and the shorter the better. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the shortcoming of "long processing time" in the existing AZ91 magnesium alloy micro-arc oxidation treatment method, and provide a reasonable AC plasma that can reduce the surface treatment time of AZ91 magnesium alloy to 60-90 second...

Claims

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Application Information

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