Preparation method of composite film on surface of magnesium alloy and solution formula for preparation method

A surface composite and magnesium alloy technology, applied in the direction of anodic oxidation, etc., can solve problems such as difficult industrial application, inability to process shapes, weak film bonding force, etc., and achieve the effect of increased bonding strength, low cost, and improved bearing capacity

Inactive Publication Date: 2012-01-18
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

Taking the plasma electrolytic oxidation technology involved in the present invention as an example, the existing composite method is to achieve co-deposition with the ceramic phase in the film layer under the action of plasma electrolytic oxidation by adding functional particles to the electrolyte, Or the composite film can be prepared by subsequent thermal spraying, physical vapor deposition, chemical plating, electroplating and other treatments on the ceramic oxide film, but these composite methods have cumbersome process, high cost, difficult to control, and cannot process workpieces with complex shapes, etc. problem, it is not easy to realize industrial application
At the same time, there is also the disadvantage of weak film bonding, which is caused by the inherent defects of mechanical bonding and molecular bond bonding in these subsequent surface treatment technologies.

Method used

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  • Preparation method of composite film on surface of magnesium alloy and solution formula for preparation method
  • Preparation method of composite film on surface of magnesium alloy and solution formula for preparation method

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preparation example Construction

[0016] The present invention is a kind of preparation method of magnesium alloy surface composite film layer and its solution formula, and its method step is:

[0017] (1) Place the polished and cleaned magnesium alloy workpiece in the electrolyte solution containing the elements to be infiltrated and first perform plasma electrolytic infiltration treatment, and form a surface modification layer containing the distribution of infiltrated elements on its surface;

[0018] (2) After the workpiece to be processed is cleaned, it is placed in an alkaline electrolyte for plasma electrolytic oxidation treatment, and finally a composite film with high hardness, corrosion resistance, wear resistance and friction reduction is obtained on the surface of the workpiece. layer.

[0019] According to the above-mentioned preparation method, the magnesium alloy workpiece is connected to the electrode of the power supply during the plasma electrolytic infiltration treatment, the treatment proce...

Embodiment 1

[0025] The processed sample is cast AZ91D magnesium alloy, which is cut into discs with specifications of

[0026] The specific operation steps are:

[0027] 1. Sample pretreatment: The sample was polished with 400-mesh, 800-mesh, and 1500-mesh sandpaper in sequence, and washed with distilled water.

[0028] 2. The sample is first subjected to plasma electrolysis osmosis treatment: the sample is connected to the power electrode, placed in a solution composed of formamide 20ml / L, sodium hydroxide 2g / L, control voltage: 200V, frequency: 600HZ, duty cycle 50 %, the processing time is 30min.

[0029] 3. The sample is subjected to plasma electrolytic oxidation treatment: After the sample is treated with plasma electrolytic infiltration, it is cleaned with distilled water, connected to the anode of the power supply, and placed in a composition composed of sodium silicate 25g / L, sodium aluminate 7g / L, and sodium hydroxide 2g. / L, in a solution of potassium fluoride 20g / L. Contro...

Embodiment 2

[0031] The processed sample is cast AZ91D magnesium alloy, which is cut into discs with specifications of

[0032] The specific operation steps are:

[0033] 1. Sample pretreatment: The sample was polished with 400-mesh, 800-mesh, and 1500-mesh sandpaper in sequence, and washed with distilled water.

[0034] 2. The sample is first subjected to plasma electrolysis osmosis treatment: the sample is connected to the power electrode, placed in a solution composed of formamide 50ml / L, thiourea 40g / L, sodium hydroxide 5g / L, control voltage: 330V, frequency: 700HZ, duty cycle 20%, processing time 50min.

[0035] 3. The sample is subjected to plasma electrolytic oxidation treatment: After the sample is treated with plasma electrolytic infiltration, it is cleaned with distilled water, connected to the anode of the power supply, and placed in a composition composed of sodium silicate 15g / L, sodium molybdate 5g / L, and sodium tungstate 7g / L, potassium hydroxide 6g / L, potassium fluorid...

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Abstract

The invention relates to a preparation method of a composite film on the surface of a magnesium alloy and a solution formula for the preparation method. The preparation method comprises the following steps of: (1) placing a polished and washed magnesium alloy work piece into electrolyte containing elements to be permeated and then carrying out plasma electrolytic permeation treatment to form a surface modified layer containing distributed permeated elements on the surface of the magnesium alloy work piece; (2) washing the processed work piece, placing the processed work piece into alkaline electrolyte and carrying out plasma electrolytic oxidation treatment; and finally, obtaining a composite film on the surface of the work piece, wherein the composite film has excellent combination properties, such as high hardness, corrosion resistance, wear resistance and friction reduction. The solution formula for the preparation method is as follows: the electrolyte for carrying out the plasma electrolytic permeation treatment contains 10-140 g/L of compound A containing elements C, N, B and S to be permeated and 2-30 g/L of sodium hydroxide; and the compound A is one or combination of more of formamide, urea, ethanolamine, borax and thiourea.

Description

technical field [0001] The invention relates to a surface modification method of magnesium alloy. Background technique [0002] At present, the main methods of surface modification of non-ferrous alloy materials at home and abroad are: thermal spraying, chemical plating, electroplating, organic coating, thermal diffusion, vapor deposition, high-energy beam surface modification, chemical conversion, anodic oxidation, plasma electrolytic oxidation, etc. . New technology of surface engineering - plasma electrolytic deposition technology can be divided into two branches: plasma electrolytic infiltration technology and plasma electrolytic oxidation technology, among which plasma electrolytic oxidation is an advanced surface treatment technology developed on the basis of anodic oxidation , mainly used in aluminum, magnesium, titanium and other non-ferrous alloys, can directly grow a layer of ceramic oxide film on the surface in situ, compared with similar technologies, the perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/30
Inventor 马颖王劲松郝远马跃洲黄晓峰王宇顺
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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