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AZ91 magnesium alloy surface treating method

A technology of AZ91 surface treatment, 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: 2007-01-24
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 present invention discloses AZ 91 magnesium alloy surface treatment method, relating to AZ 91 magnesium alloy electrochemistry surface treatment field. It contains voltage regulator controlled voltage 68-80 v power frequency ac power supply, in tap water prepared potassium fluoride containing 500-979g / L and potassium hydroxide 300-349g / L basicity treatment fluid, making 60-90 second ac plasma element of an arc oxidizing treatment to AZ 91 magnesium alloy workpiece, to make AZ 91 magnesium alloy workpiece surface in situ growing 15-30 micrometer thickness uniform and complete milkiness ceramics layer, said process shortening surface treatment time.

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