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Nanocrystallization coating preparation method utilizing linear/annular microplasma discharge self-balancing technology

A micro-plasma, self-balancing technology, applied in the direction of surface reaction electrolytic coatings, coatings, electrolytic coatings, etc., can solve the problems of direct application difficulties and achieve the effects of eliminating violent eruption effects, improving microhardness and wear resistance

Active Publication Date: 2018-12-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, according to foreign research results, the ratio of dense layer to loose layer can only be controlled at 4:1 to prepare a single dense layer with a thickness of more than 60 μm, and it is very difficult to realize its direct application under wear-resistant conditions.

Method used

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  • Nanocrystallization coating preparation method utilizing linear/annular microplasma discharge self-balancing technology
  • Nanocrystallization coating preparation method utilizing linear/annular microplasma discharge self-balancing technology
  • Nanocrystallization coating preparation method utilizing linear/annular microplasma discharge self-balancing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1. Material preparation: After the 5A02 aluminum alloy is cut and polished, it is cleaned and degreased by ultrasonic waves in acetone solution.

[0047] 2. For voltage control waveform diagram, see figure 1 , the voltage control mode is within one cycle:

[0048] Forward voltage 10 ~ 500V, duty cycle 50%;

[0049] Voltage 0V, duty cycle 10%;

[0050] Negative voltage 10~300V, duty cycle 30%;

[0051] Voltage 0V, duty cycle 10%.

[0052] 3. The construction of nano-scale point-like plasma discharge sparks is as follows: the shape of plasma discharge sparks is adjusted from micron-scale sprays to nano-scale white dots; the specific solution parameters are:

[0053] Main salt (sodium gluconate) 8-10g / L; pH regulator (sodium hydroxide) 2g / L; additive (sodium aluminate) 1-2g / L; stabilizer (sodium silicate) 3-5g / L; Cellulose 1g / L; water is the balance.

[0054] The electrical parameters are:

[0055] Oxidation time: 0-90 minutes; Forward voltage: 10-500V; Forward curr...

Embodiment 2

[0073] 1. Material preparation: After the 2024 aluminum alloy is cut and polished, it is cleaned and degreased by ultrasonic waves in acetone solution.

[0074] 2. The voltage control method is within one cycle:

[0075] Forward voltage 10 ~ 550V, duty cycle 70%;

[0076] Voltage 0V, duty cycle 5%;

[0077] Negative voltage 10~150V, duty cycle 20%;

[0078] Voltage 0V, duty cycle 5%.

[0079] 3. The construction of nano-scale point-like plasma discharge sparks is as follows: the shape of plasma discharge sparks is adjusted from micron-scale jets to nano-scale white dots. The specific solution parameters are:

[0080] Main salt (sodium gluconate) 8-10g / L; pH regulator (sodium hydroxide) 2g / L; additive (sodium aluminate) 1-2g / L; stabilizer (sodium silicate) 3-5g / L; Cellulose 1g / L; water is the balance.

[0081] The electrical parameters are:

[0082] Oxidation time: 0-100 minutes; Forward voltage: 10-550V; Forward current density: 1-4A / cm 2 ;Negative voltage: 10~150V; Neg...

Embodiment 3

[0097] 1. Material preparation: After the 7075 aluminum alloy is cut and polished, it is cleaned and degreased by ultrasonic waves in acetone solution.

[0098] 2. The voltage control method is within one cycle:

[0099] Forward voltage 10 ~ 500V, duty cycle: 60%;

[0100] Voltage 0V, duty cycle 10%;

[0101] Negative voltage 10~130V, duty cycle 20%;

[0102] Voltage 0V, duty cycle 10%.

[0103] 3. The construction of the nano-scale point plasma discharge spark is as follows: the shape of the plasma discharge spark is adjusted from a micron-scale spray shape to a nano-scale white point shape. The specific solution parameters are:

[0104] Main salt (sodium gluconate) 0~10g / L; pH regulator (sodium hydroxide) 0~2g / L; additive (sodium aluminate) 1.5~3g / L; stabilizer (sodium silicate) 2~4g / L L; Cellulose 1~3g / L;

[0105] The electrical parameters are:

[0106] Oxidation time 0-140 minutes; forward voltage 10-500V; forward current density 2-5A / cm 2 ; Negative voltage 10~130V...

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Abstract

The invention discloses a nanocrystallization coating preparation method utilizing a linear / annular microplasma discharge self-balancing technology and belongs to the technical field of metal surfacetreatment. According to the nanocrystallization coating preparation method, aluminum alloy or an aluminum matrix composite material is taken as a matrix material, the linear / annular microplasma discharge self-balancing technology is utilized, and linear / annular micro-arc oxidation plasma discharge spark is structured on the surface of the aluminum alloy, so that the nano-scale single compact micro-arc oxidation coating is prepared on the surface of the matrix material. The nanocrystallization ceramic coating prepared by the method has good corrosion resistance and wear resistance at the same time and has extremely high hardness, and the problems that the coating prepared by a traditional micro-arc oxidation treatment technology has thick loose layers, low hard phase alpha-Al2O3 content andcannot meet the requirements of high wear resistance, hardness, corrosion resistance, good binding force and the like are solved.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a method for preparing a nano-coating by using a linear / circular micro-plasma discharge self-balancing technology. Background technique [0002] Micro-arc oxidation plasma beam technology is developed on the basis of anodic oxidation. Its purpose is to prepare a ceramic layer with high hardness, wear resistance and corrosion resistance on the surface of aluminum alloy materials. It is an effective surface strengthening method for aluminum alloy parts. new technology. The aluminum oxide ceramic layer formed under micro-arc oxidation conditions forms a metallurgical bond with the substrate, with strong bonding force and high hardness. The ceramic film layer formed by the traditional micro-arc oxidation plasma beam technology is usually composed of a dense layer and a loose layer. The hardness, wear resistance, and corrosion resistance of the loose layer are much di...

Claims

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Application Information

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IPC IPC(8): C25D11/06B82Y40/00
CPCB82Y40/00C25D11/024C25D11/026C25D11/06
Inventor 张伟邱骥朱圣龙李海波王福会
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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