Aluminum alloy surface treatment method

An aluminum alloy surface, aluminum alloy technology, applied in the direction of surface reaction electrolytic coating, electrolytic coating, anodizing, etc., can solve the problems of the effect of the sealing process, the complicated operation, the influence of the inherent performance of the aluminum alloy, etc., to achieve low cost and high efficiency The effect of production efficiency and short process

Active Publication Date: 2019-07-26
同曦集团有限公司
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  • Description
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  • Application Information

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Problems solved by technology

[0005] CN 104005072A discloses a method of using titanium dioxide gel to seal the pores of the anodic oxidation film on the surface of the aluminum alloy. The method is to anodize the aluminum alloy base material, electrolytically color it and seal the pores with nanometer titanium dioxide gel. The titanium dioxide gel seals the pores Nano-titanium dioxide with self-cleaning and bactericidal effects exists stably on the surface of the aluminum alloy, making it self-cleaning, and together with the nano-metal antibacterial particles, the aluminum alloy has double antibacterial properties, expanding the application range of aluminum alloys, but this method The steps of oxidation, coloring and sealing are carried out separately, the operation is relatively cumbersome, and the residue of oxidizing solution will have a great impact on the sealing process
CN 105970268A discloses an aluminum alloy surface anodic oxidation-sealing treatment method, which includes surface pretreatment of the aluminum alloy, forming an oxide film on the obtained aluminum alloy through anodic oxidation in the electrolyte, and then undergoing secondary surface sealing treatment Finally, after washing with water and air-drying, the aluminum alloy is obtained, but the sealing treatment is carried out twice in this method, and the sealing agent used contains more organic components, which will affect the inherent properties of the aluminum alloy.

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Embodiment 1

[0058] This embodiment provides a method for aluminum alloy surface treatment, the process flow chart of the method is as follows figure 1 shown, including the following steps:

[0059] (1) Sand blast the aluminum alloy first, the particle size of the sand used is 100 mesh, and then use 50g / L sodium hydroxide solution for alkaline cleaning for 5 minutes. Carry out pickling, the solution used for pickling is 200g / L nitric acid solution, pickling treatment at 20°C for 5 minutes, wash with deionized water and then blow dry;

[0060] (2) Place the aluminum alloy processed in step (1) in an acidic oxidation solution, wherein the composition of the acidic oxidation solution is: sulfuric acid 150g / L, silver nitrate 0.8g / L, aluminum sulfate 32g / L, cerium nitrate 10g / L L, oxidation and deposition are carried out alternately under the conditions of power supply voltage 30V and alternating current, the time of alternating current is 1min in the positive direction and 1min in the negativ...

Embodiment 2

[0063] This embodiment provides a method for surface treatment of an aluminum alloy, the method comprising the following steps:

[0064] (1) Sand blast the aluminum alloy first, the particle size of the sand used is 50 mesh, and then use 40g / L sodium hydroxide solution for alkali washing treatment for 6 minutes. Carry out pickling, the solution used for pickling is 180g / L nitric acid solution, pickling treatment at 25°C for 6 minutes, wash with deionized water and then blow dry;

[0065] (2) Place the aluminum alloy processed in step (1) in acidic oxidation solution, wherein the composition of acidic oxidation solution is: sulfuric acid 140g / L, silver nitrate 1.2g / L, aluminum nitrate 35g / L, cerium nitrate 15g / L L, under the condition of power supply voltage of 25V and alternating current, oxidation and deposition are carried out alternately. The time of alternating current is 1.2min in the positive direction and 0.8min in the negative direction, and the current density of the ...

Embodiment 3

[0068] This embodiment provides a method for surface treatment of an aluminum alloy, the method comprising the following steps:

[0069] (1) Sand blast the aluminum alloy first, the particle size of the sand used is 150 mesh, and then use 45g / L potassium hydroxide solution for alkali washing treatment for 3 minutes, the temperature of alkali washing is 32 °C, after washing with deionized water Carry out pickling, the solution used for pickling is 190g / L nitric acid solution, pickling at 30°C for 4 minutes, washing with deionized water and drying;

[0070] (2) Place the aluminum alloy processed in step (1) in an acidic oxidation solution, wherein the composition of the acidic oxidation solution is: sulfuric acid 145g / L, silver nitrate 1.0g / L, aluminum sulfate 30g / L, cerium nitrate 12g / L L, under the condition of power supply voltage of 35V and alternating current, oxidation and deposition are alternately carried out. The time of alternating current is 0.8min in the positive dir...

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Abstract

The invention provides an aluminum alloy surface treatment method. The aluminum alloy surface treatment method comprises the steps of conducting pretreatment on an aluminum alloy, putting the aluminumalloy into acid oxidation liquid to be subjected to oxidation and deposition under the AC condition, reducing the voltage, and conducting hole sealing treatment in the same solution to obtain the anti-microbial aluminum alloy. According to the aluminum alloy surface treatment method, the aluminum alloy is subjected to anodic oxidation, anti-microbial elements are deposited, hole sealing treatmentis conducted; hole sealing treatment can be conducted in the same solution, and then the anti-microbial and corrosion-resistant aluminum alloy is obtained. The aluminum alloy surface treatment methodis implemented through the one-step method. The process is simplified. The production efficiency of the anti-microbial aluminum alloy is improved. The production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of metal materials, and relates to a method for surface treatment of aluminum alloys. Background technique [0002] Aluminum alloy is a kind of non-ferrous metal structural material widely used in industry, and has been widely used in aerospace, automobile, machinery manufacturing, shipbuilding and chemical industry. However, the chemical properties of aluminum alloys are relatively active. Although an oxide film can be formed on the surface, the protective ability of this oxide film is poor and cannot effectively delay the corrosion damage of aluminum alloys. Therefore, surface treatment of aluminum alloys is required to improve Its wear-resistant and corrosion-resistant properties. [0003] Anodizing treatment is one of the most commonly used surface protection technologies for non-ferrous metals. It can form an anodized film on the surface of aluminum alloys. However, the oxide film ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/16C25D11/08C25D11/20C25D3/46
CPCC25D3/46C25D11/024C25D11/08C25D11/16C25D11/20
Inventor 徐传孟姜阅程兆俊薛烽白晶张力
Owner 同曦集团有限公司
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