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Preparation method of composite film on surface of metallic material and solution composition for preparation method

A metal material and surface composite technology, which is applied in the field of metal materials, can solve problems such as difficult industrial application, inability to process shapes, and weak bonding force of the film layer, and achieve the effects of increased bonding strength, low cost, and improved bearing capacity

Inactive Publication Date: 2012-01-18
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 metallic material and solution composition for preparation method
  • Preparation method of composite film on surface of metallic material and solution composition for preparation method
  • Preparation method of composite film on surface of metallic material and solution composition for preparation method

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preparation example Construction

[0016] The present invention is a kind of preparation method of metal material surface composite membrane layer and its solution composition, and its method step is:

[0017] (1) Place the polished and cleaned metal 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. Floor.

[0019] The metal material treated by this method is magnesium alloy, or aluminum alloy, or titanium alloy, or steel.

[0020] When performing plasma electrolytic infiltration treatment, connect the metal workpiece to...

Embodiment 1

[0026] The processed sample is cast AZ91D magnesium alloy, which is cut into discs with specifications of

[0027] The specific operation steps are:

[0028] 1. Sample pretreatment: The sample was polished with 400-mesh, 800-mesh, and 1500-mesh sandpaper in sequence, and washed with distilled water.

[0029] 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.

[0030] 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

[0032] The processed sample is cast AZ91D magnesium alloy, which is cut into discs with specifications of

[0033] The specific operation steps are:

[0034] 1. Sample pretreatment: The sample was polished with 400-mesh, 800-mesh, and 1500-mesh sandpaper in sequence, and washed with distilled water.

[0035] 2. The sample is first subjected to plasma electrolytic osmosis treatment: the sample is connected to the power electrode, placed in a solution composed of formamide 50ml / L, thiourea 40g / L, and sodium hydroxide 5g / L, control voltage: 330V, frequency: 700HZ, duty cycle 20%, processing time 50min.

[0036]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 fluo...

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Abstract

The invention relates to a preparation method of a composite film on the surface of a metallic material and a solution composition for the preparation method. The preparation method comprises the following steps of: (1) placing a polished and washed metal 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 metal work piece; (2) washing the processed work piece, then 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 composition 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 the combination of more of formamide, urea, ethanolamine, borax and thiourea.

Description

technical field [0001] The invention relates to a surface modification method in the technical field of metal materials. Background technique [0002] At present, the 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 them, plasma electrolytic infiltration is to realize ion implantation of elements such as nitrogen, carbon and metal on the workpiece surface The new technology for surface modification is mainly used in the field of surface modification of ferrous metals. Compared with high-energy beam ion implantation and chemical heat treatment plasma implantation infiltration methods, it has the advantages of high efficiency, low cost, and the ability to process complex workpieces. Plasma electrolytic oxidation is an advanced surface treatment technology developed on the basis of anodic oxidation. It is mainly used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/02
Inventor 马颖王劲松郝远马跃洲
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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