Aluminum alloy coating

A technology of aluminum alloy and coating, applied in the direction of coating, surface reaction electrolytic coating, electrolytic coating, etc., can solve the problems of limitation, wear resistance, poor corrosion resistance, etc., achieve low friction coefficient, film quality improvement, Effect of Low Roughness Surfaces

Pending Publication Date: 2022-07-12
孙志刚
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its poor wear resistance and corrosion resistance, its application is limited. It is of great significance to expand its application field by improving its wear resistance and corrosion resistance without changing the overall performance of the matrix material through surface modification.

Method used

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  • Aluminum alloy coating
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] An aluminum alloy coating is prepared by the following steps:

[0059] (1) Pretreatment of aluminum alloy surface: heat treatment, mechanical polishing, degreasing and degreasing, washing and drying;

[0060] The heat treatment is to place the aluminum alloy in an inert atmosphere of 350° C., and keep it at a constant temperature for 30 minutes;

[0061] The mechanical polishing is to grind the aluminum alloy step by step under the conditions of 60#, 300#, 1000#, and 2000# sandpaper successively;

[0062] The degreasing and degreasing is carried out by using an alkaline degreasing solution. The components of the alkaline degreasing solution are as follows: sodium bicarbonate 42g / L, sodium carbonate 38g / L, EDTA 5g / L, temperature 43°C, time 5min.

[0063] The water washing is to use deionized water at 45° C.;

[0064] The drying treatment is air purging;

[0065] (2) One-time micro-arc oxidation treatment: The micro-arc oxidation electrolyte is NaOH 5g / L, Na2SiO3 11 g...

Embodiment 2

[0071] An aluminum alloy coating is prepared by the following steps:

[0072] (1) Pretreatment of aluminum alloy surface: heat treatment, mechanical polishing, degreasing and degreasing, washing and drying;

[0073] In the heat treatment, the aluminum alloy is placed in an inert atmosphere at 355° C. for 35 minutes at a constant temperature.

[0074] The mechanical polishing is to grind the aluminum alloy step by step under the conditions of 60#, 300#, 1000#, and 2000# sandpaper in sequence.

[0075] The degreasing and degreasing is carried out by using an alkaline degreasing solution. The components of the alkaline degreasing solution are as follows: sodium bicarbonate 42g / L, sodium carbonate 38g / L, EDTA 5g / L, temperature 43°C, time 5min.

[0076] The water washing is rinsing with deionized water at 45°C.

[0077] The drying process is air purging.

[0078] (2) One-time micro-arc oxidation treatment: The micro-arc oxidation electrolyte is NaOH 6g / L, Na2SiO3 11.5g / L, NaF1....

Embodiment 3

[0084] An aluminum alloy coating is prepared by the following steps:

[0085] (1) Pretreatment of aluminum alloy surface: heat treatment, mechanical polishing, degreasing and degreasing, washing and drying;

[0086] The heat treatment is to place the aluminum alloy in an inert atmosphere of 360° C., and to stand for 40 minutes at a constant temperature;

[0087] The mechanical polishing is to grind the aluminum alloy step by step under the conditions of 60#, 300#, 1000#, and 2000# sandpaper successively;

[0088] The degreasing and degreasing is carried out by using an alkaline degreasing solution. The components of the alkaline degreasing solution are as follows: sodium bicarbonate 42g / L, sodium carbonate 38g / L, EDTA 5g / L, temperature 43°C, time 5min.

[0089] The water washing is to use deionized water at 45° C.;

[0090] The drying treatment is air purging;

[0091] (2) One-time micro-arc oxidation treatment: The micro-arc oxidation electrolyte is NaOH 7g / L, Na2SiO3 12 ...

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Abstract

The invention provides an aluminum alloy coating, the thickness of the coating is 40-50 [mu] m, the coating is obtained through two times of micro-arc oxidation treatment, the surface roughness Ra of the coating is 1.5-2.5 [mu] m, the thickness of the coating is 40-50 [mu] m, the hardness of the coating is 1700-1800 HV0. 5, and the friction coefficient mu of the coating is 0.45-0.57, pretreatment is carried out before the two times of micro-arc oxidation, and polishing wax polishing is carried out in the two times of micro-arc oxidation. Post-treatment is carried out after the two times of micro-arc oxidation, and electrolyte used for the two times of micro-arc oxidation is the same in component and different in composition ratio and comprises NaOH, Na2SiO3, NaF, P123 surfactants and ethynyl methanol.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of aluminum or aluminum alloy materials. Background technique [0002] Aluminum, magnesium, titanium and their alloys have the advantages of low density, high specific strength and easy forming and processing, and are widely used in aviation, aerospace, transportation and other industrial fields. However, due to its poor wear resistance and corrosion resistance, its application is limited. It is of great significance to improve the wear resistance and corrosion resistance for expanding its application field by surface modification treatment without changing the overall performance of the matrix material. . [0003] Microarc Oxidation (MAO), also known as Plasma Electrolytic Oxidation (PEO), refers to the use of instantaneous high-temperature sintering in the micro-arc discharge area, and the Surface strengthening technology for surface preparation of ceramic film. Its working process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/06C25D11/12C25D11/16C25D11/18B24B1/00C09G1/02C09G1/08C22F1/057C22F1/02C22C21/14C22C21/16C23G1/22
CPCC25D11/026C25D11/06C25D11/12C25D11/16C25D11/18B24B1/00C09G1/02C09G1/08C22F1/057C22F1/02C22C21/14C22C21/16C23G1/22
Inventor 孙志刚
Owner 孙志刚
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