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Preparation method of low-voltage self-repairing aluminum alloy micro-arc oxidation film

A micro-arc oxidation and self-healing technology, applied in anodizing, electrolytic coatings, surface reaction electrolytic coatings, etc., can solve problems such as affecting corrosion resistance and wear resistance, loss of electrical energy, etc., to improve product performance, reduce energy consumption, The simple effect of sewage treatment

Pending Publication Date: 2021-06-18
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, subject to the principle of micro-arc oxidation, there will be "crater"-shaped holes on the surface of the micro-arc oxidation ceramic layer due to high discharge-melting-solidification, and these holes will affect its corrosion resistance and wear resistance.
Moreover, the traditional micro-arc oxidation needs to be carried out under high voltage conditions. The arc starting voltage is about 270V and the termination voltage is above 500V, which greatly consumes electric energy, which is inconsistent with the development trend of energy saving and environmental protection. Therefore, it is necessary to reduce the voltage of micro-arc oxidation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. The sample is made of 2024 aluminum alloy plate, cut into a 25mm×20mm×2mm rectangle, and holes are punched on the edge of the sample for connecting wires;

[0025] 2. Use sandpaper to polish the surface of the sample to 1500#, put it into an ultrasonic cleaner, clean it with absolute ethanol, and dry it for later use;

[0026] 3. Electrolyte adopts silicate system, sodium silicate nonahydrate 15g L -1 , Potassium hydroxide 5g·L -1 ; Corrosion inhibitor nano serpentine particles 6g L -1 , dispersant polyethylene glycol 1g L -1 ; Additive potassium fluoride 10g L -1 , glycerin 1ml·L -1 ;

[0027] 4. Use a pulse power supply for micro-arc oxidation, adopt constant voltage mode, increase the voltage step by step, and finally increase to 200V, and the oxidation time is 10 minutes. After the reaction is completed, use deionized water and absolute ethanol to clean and dry.

Embodiment 2

[0029] 1. The sample is made of 2024 aluminum alloy plate, cut into a 25mm×20mm×2mm rectangle, and holes are punched on the edge of the sample for connecting wires;

[0030] 2. Use sandpaper to polish the surface of the sample to 1500#, put it into an ultrasonic cleaner, clean it with absolute ethanol, and dry it for later use;

[0031] 3. The electrolyte uses a silicate system, sodium silicate nonahydrate 5g L -1 , Potassium hydroxide 1g·L -1 ; Corrosion inhibitor nano serpentine particles 8g L -1 , dispersant polyethylene glycol 1g·L -1 ; Additive potassium fluoride 10g L -1 , glycerin 1ml·L -1 ;

[0032] 4. Use a pulse power supply for micro-arc oxidation, adopt constant voltage mode, increase the voltage step by step, and finally increase to 200V, and the oxidation time is 10 minutes. After the reaction is completed, use deionized water and absolute ethanol to clean and dry.

Embodiment 3

[0034] 1. The sample is made of 2024 aluminum alloy plate, cut into a 25mm×20mm×2mm rectangle, and holes are punched on the edge of the sample for connecting wires;

[0035] 2. Use sandpaper to polish the surface of the sample to 1500#, put it into an ultrasonic cleaner, clean it with absolute ethanol, and dry it for later use;

[0036] 3. Electrolyte adopts silicate system, sodium silicate nonahydrate 10g L -1 , Potassium hydroxide 1g·L -1 ; Corrosion inhibitor nano serpentine particles 10g L -1 , dispersant polyethylene glycol 1g L -1 ; Additive potassium fluoride 10g L -1 , glycerin 1ml·L -1 ;

[0037] 4. Use a pulse power supply for micro-arc oxidation, adopt constant voltage mode, increase the voltage step by step, and finally increase to 200V, and the oxidation time is 10 minutes. After the reaction is completed, use deionized water and absolute ethanol to clean and dry.

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Abstract

The invention relates to the surface treatment technology of aluminum alloys, and is suitable for preparation of a self-repairing micro-arc oxidation ceramic layer on the surface of the aluminum surface by adopting low voltage. An electrolytic solution adopts a phosphate-silicate system, and a corrosion inhibitor, a dispersing agent and an additive are added; the corrosion inhibitor comprises nano serpentine particles; the dispersing agent comprises PEG 20000, the additive comprises ethylene diamine tetraacetic acid EDTA, sodium fluoride NaF and glycerol. A micro-arc oxidation pulse power supply is adopted, the current from 1A to 500A can be continuously adjusted, the voltage from 0V to 700V can be continuously adjusted, the frequency from 50Hz to 1000Hz can be continuously adjusted, and the duty cycle from 10 percent to 30 percent can be continuously adjusted. The method is easy to operate, and is low in costs of raw materials; by adopting the method, the self-repairing micro-arc oxidation ceramic layer can be generated on the surface of the aluminum alloy under the premise of low energy consumption, the surface defects after micro-arc oxidation can be improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to an aluminum alloy surface treatment method, which is suitable for preparing a micro-arc oxidation ceramic film on the aluminum alloy surface. Background technique [0002] Aluminum alloy is an excellent non-ferrous metal material, which has the advantages of high specific strength, good machinability, good thermal and electrical conductivity, and excellent corrosion resistance. However, the aluminum alloy material has poor wear resistance and low thermal stability, and its performance cannot be improved by heat treatment. Therefore, the surface treatment technology of aluminum alloy is an important direction. Micro-arc oxidation technology was originally invented by German scientists, and my country began to contact it in the 1990s. After years of development, a series of results have been obtained. Micro-arc oxidation has the advantages of simple operation, high corrosion resistance and good bonding force of the prepared film...

Claims

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Application Information

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IPC IPC(8): C25D11/06
CPCC25D11/06C25D11/026C25D11/024
Inventor 马国峰刘志扬张鸿龄史德阳贺春林
Owner SHENYANG UNIV
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