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Aluminum alloy anode oxide film with porous subsurface layer and wear-resistant surface layer and preparation method of aluminum alloy anode oxide film

An anodic oxidation film, anodic oxidation technology, applied in the direction of anodic oxidation, surface reaction electrolytic coating, coating, etc., can solve the problems of decreased wear resistance, no significant improvement in the wear resistance of aluminum alloys, and reduced surface hardness. Improve the wear resistance, the method is simple and easy to operate, and the effect of reducing the impact

Active Publication Date: 2017-11-28
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although the oxide film formed by electrochemical reaction on the surface of aluminum alloy through anodic oxidation process can improve the corrosion resistance of aluminum alloy, it does not greatly improve the wear resistance of aluminum alloy.
And after this layer of oxide film is corroded during service, the surface hardness decreases, resulting in a decrease in wear resistance.

Method used

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  • Aluminum alloy anode oxide film with porous subsurface layer and wear-resistant surface layer and preparation method of aluminum alloy anode oxide film
  • Aluminum alloy anode oxide film with porous subsurface layer and wear-resistant surface layer and preparation method of aluminum alloy anode oxide film
  • Aluminum alloy anode oxide film with porous subsurface layer and wear-resistant surface layer and preparation method of aluminum alloy anode oxide film

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Experimental program
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Effect test

Embodiment 1

[0027] In this embodiment, the anodized film on the surface of the aluminum alloy substrate has a three-layer structure, such as figure 1 As shown, from the aluminum alloy base to the surface are the shielding layer 3 , the porous subsurface layer 2 , and the wear-resistant surface layer 1 . figure 2 is a schematic diagram of the three-dimensional structure of the anodized film.

[0028] The preparation method of the anodic oxidation film on the surface of the above-mentioned aluminum alloy substrate comprises the following steps:

[0029] (1) mechanical polishing

[0030] The aluminum alloy substrate is polished in three stages. Firstly, the aluminum alloy is roughly polished, then finely polished, and finally finely polished to obtain a mirror effect.

[0031] (2) Degreasing treatment

[0032] Degreasing the polished aluminum alloy, the degreasing agent is lye with a mass fraction of 10%, and the lye is at least one of sodium hydroxide, sodium carbonate and sodium phosph...

Embodiment 2

[0045] In this embodiment, the anodized film on the surface of the aluminum alloy substrate has a three-layer structure, that is, from the aluminum alloy substrate to the surface, there are a shielding layer, a porous subsurface layer, and a wear-resistant surface layer.

[0046] The preparation method of the anodic oxidation film on the surface of the above-mentioned aluminum alloy substrate comprises the following steps:

[0047](1) mechanical polishing

[0048] The aluminum alloy substrate is polished in three stages. Firstly, the aluminum alloy is roughly polished, then finely polished, and finally finely polished to obtain a mirror effect.

[0049] (2) Degreasing treatment

[0050] Degreasing the polished aluminum alloy, the degreasing agent is lye with a mass fraction of 15%, and the lye is at least one of sodium hydroxide, sodium carbonate and sodium phosphate, and is treated at 30° C. for 13 minutes.

[0051] (3) Anodizing

[0052] Put the degreased aluminum alloy s...

Embodiment 3

[0063] In this embodiment, the anodized film on the surface of the aluminum alloy substrate has a three-layer structure, that is, from the aluminum alloy substrate to the surface, there are a shielding layer, a porous subsurface layer, and a wear-resistant surface layer.

[0064] The preparation method of the anodic oxidation film on the surface of the above-mentioned aluminum alloy substrate comprises the following steps:

[0065] (1) mechanical polishing

[0066] The aluminum alloy substrate is polished in three stages. Firstly, the aluminum alloy is roughly polished, then finely polished, and finally finely polished to obtain a mirror effect.

[0067] (2) Degreasing treatment

[0068] Degreasing the polished aluminum alloy, the degreasing agent is lye with a mass fraction of 15%, and the lye is at least one of sodium hydroxide, sodium carbonate and sodium phosphate, and is treated at 40° C. for 10 minutes.

[0069] (3) Anodizing

[0070] Put the degreased aluminum alloy ...

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Abstract

The invention provides an aluminum alloy anode oxide film with a porous subsurface layer and a wear-resistant surface layer. The anode oxide film is of a three-layer structure, namely a shielding layer, the porous subsurface layer and the wear-resistant surface layer from an aluminum alloy matrix to exterior. The anode oxide film achieves the effects of greatly improving the wear resistance of the aluminum alloy and widening the application field of the aluminum alloy. In addition, with the adoption of an anodic oxidation method, the aluminum alloy serves as an anode and a cathode in the anodic oxidation process, the electrolyte comprises sulfuric acid, a wide temperature range oxidant and an aluminum ion, and the growth speed and dissolution rate of the anode oxide film are controlled by an electrolyte formula by controlling the anodic oxidation current density, so that the aluminum alloy anode oxide film with the porous subsurface layer and the wear-resistant surface layer is obtained.

Description

technical field [0001] The invention relates to the field of aluminum alloy surface treatment, in particular to an aluminum alloy anodized film with a porous subsurface layer and a wear-resistant surface layer and a preparation method thereof. Background technique [0002] Aluminum alloy has the advantages of low density, high specific strength, good plasticity, and easy processing and forming. It is the second only metal material used in industry after steel. Aluminum alloy has excellent electrical conductivity, thermal conductivity and corrosion resistance, so it is widely used in Aviation, aerospace, automobile, marine, machinery manufacturing, nuclear industry, weapon industry and other fields. [0003] However, at present, there are still deficiencies in the service of aluminum alloys, such as: being susceptible to wear and corrosion and failure, which brings great safety hazards and economic losses to engineering applications; Due to defects, it cannot be directly put...

Claims

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Application Information

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IPC IPC(8): C25D11/08C25D11/16
CPCC25D11/08C25D11/16
Inventor 赵文杰吴英豪张彦彦秦立光王立平薛群基
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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