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Treatment method of black hard microarc oxidation ceramic membrane on surface of magnesium alloy

A technology of micro-arc oxidation and treatment method, applied in anodizing and other directions, can solve the problem of inability to be processed into dark color or even black, and achieve the effect of improving color stability, simple process and small size change

Inactive Publication Date: 2011-04-20
杭州意来客电器设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a treatment method for black hard micro-arc oxidation ceramic film on the surface of magnesium alloy, which mainly solves the problem that the ceramic film color of magnesium alloy micro-arc oxidation treatment in the prior art is mostly white or off-white, which cannot be processed into deep Technical issues such as color and even black

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: a kind of magnesium alloy surface black hard micro-arc oxidation ceramic film processing method of this example, its steps are:

[0018] a. Add sodium phosphate 20g / L, sodium fluoride 10g / L, sodium hydroxide 0.5g / L, sodium molybdate 2g / L, potassium carbonate 8g / L, sodium tungstate 3g / L, copper sulfate 25g / L, Potassium dichromate 10g / L, prepared into an alkaline electrolytic solution, the pH range of the alkaline electrolytic solution: 10-13;

[0019] b. Stir the prepared alkaline electrolytic solution at a constant temperature of 25°C for 24 hours, then let it stand at a constant temperature of 25°C for 24 hours, and set aside;

[0020] c. Immerse the magnesium alloy and stainless steel plate in the alkaline electrolytic solution, use the magnesium alloy as the anode, and the stainless steel plate as the cathode. After connecting the power supply, perform micro-arc oxidation treatment on the surface of the magnesium alloy. The empty ratio is 10%, the n...

Embodiment 2

[0021] Embodiment 2: a kind of magnesium alloy surface black hard micro-arc oxidation ceramic film processing method of this example, its steps are:

[0022] a. Add sodium phosphate 30g / L, sodium fluoride 12g / L, sodium hydroxide 1g / L, sodium molybdate 5g / L, potassium carbonate 6g / L, sodium tungstate 2g / L, copper sulfate 30g / L, weight Potassium chromate 12g / L, prepared into alkaline electrolytic solution, pH range of alkaline electrolytic solution: 10-13;

[0023] b. Stir the prepared alkaline electrolytic solution at a constant temperature of 25°C for 24 hours, then let it stand at a constant temperature of 25°C for 24 hours, and set aside;

[0024] c. Immerse the magnesium alloy and stainless steel plate in the alkaline electrolytic solution, use the magnesium alloy as the anode, and the stainless steel plate as the cathode. After connecting the power supply, perform micro-arc oxidation treatment on the surface of the magnesium alloy. The empty ratio is 15%, the number ra...

Embodiment 3

[0025] Embodiment 3: a kind of magnesium alloy surface black hard micro-arc oxidation ceramic film processing method of this example, its steps are:

[0026] a. Add sodium phosphate 40g / L, sodium fluoride 20g / L, sodium hydroxide 0.5g / L, sodium molybdate 2g / L, potassium carbonate 8g / L, sodium tungstate 5g / L, copper sulfate 40g / L, Potassium dichromate 15g / L, prepared into an alkaline electrolytic solution, the pH range of the alkaline electrolytic solution: 10-13;

[0027] b. Stir the prepared alkaline electrolytic solution at a constant temperature of 25°C for 24 hours, then let it stand at a constant temperature of 25°C for 24 hours, and set aside;

[0028] c. Immerse the magnesium alloy and stainless steel plate in the alkaline electrolytic solution, use the magnesium alloy as the anode and the stainless steel plate as the cathode, and then perform micro-arc oxidation treatment on the surface of the magnesium alloy after connecting to the power supply. The empty ratio is ...

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Abstract

The invention belongs to the treatment technology of a black hard ceramic membrane on the surface of magnesium alloy, in particular relating to a treatment method of a black hard microarc oxidation ceramic membrane on the surface of magnesium alloy. The invention mainly solves the technical problems that the colour of a ceramic membrane treated by magnesium alloy microarc oxidation is white or grey white mostly and the deep colour and even black ceramic membranes can not be obtained in the prior art. The method provided by the invention comprises the steps that sodium phosphate, sodium fluoride, sodium hydroxide, sodium molybdate, potassium carbonate, sodium tungstate, copper sulphate and potassium dichromate are added into water and prepared into an alkaline electrolytic solution, and the solution is stirred for later use; and then magnesium alloy and a stainless steel plate are immersed into the alkaline electrolytic solution, the magnesium alloy is taken as an anode, the stainless steel plate is taken as a cathode, and microarc oxidation treatment is carried out until a compact black hard ceramic membrane grows in situ on the surface of the magnesium alloy.

Description

technical field [0001] The invention relates to a processing technology of a black hard ceramic film on the surface of a magnesium alloy, in particular to a method for treating a black hard micro-arc oxidation ceramic film on the surface of a magnesium alloy. Background technique [0002] Magnesium alloy is an alloy with the lightest specific gravity used in modern industrial alloys. It has a high strength-to-weight ratio [1] and good shockproof performance. It is mainly used in missile guidance systems, landing hubs, engine casings, etc. part. In recent years, magnesium and its alloys have become an important substitute for lightweight structural materials [2-3]. Magnesium alloys are also used in automotive and electronics industries that require high strength, high vibration damping, electromagnetic shielding, and good mechanical properties [4]. The most basic advantage of magnesium is its low density (1.74g / cm 3 ), replacing aluminum alloy castings with magnesium alloy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
Inventor 郝建明
Owner 杭州意来客电器设备有限公司
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