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A kind of micro-arc oxidation method of aluminum-lithium alloy and electrolyte used therefor

A micro-arc oxidation, aluminum-lithium alloy technology, applied in electrolytic coatings, anodic oxidation, surface reaction electrolytic coatings, etc., to achieve excellent protection effect, reduce arc voltage, and enhance conductivity.

Active Publication Date: 2022-02-25
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the main problem is the lack of a micro-arc oxidation electrolyte for the corrosion resistance of aluminum-lithium alloys, which has the characteristics of low cost and high efficiency, so as to quickly form a film layer with a certain thickness and protective effect

Method used

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  • A kind of micro-arc oxidation method of aluminum-lithium alloy and electrolyte used therefor
  • A kind of micro-arc oxidation method of aluminum-lithium alloy and electrolyte used therefor
  • A kind of micro-arc oxidation method of aluminum-lithium alloy and electrolyte used therefor

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Embodiment 1

[0045] This embodiment relates to an aluminum-lithium alloy micro-arc oxidation method and a method for preparing a micro-arc oxidation electrolyte. The process of the method is as follows figure 1 As shown, the schematic diagram of the aluminum-lithium alloy micro-arc oxidation sample is as follows figure 2 shown. The micro-arc oxidation method is specifically:

[0046] 1. Prepare the sample Al-2Li-2Cu-0.2Zr cast aluminum-lithium alloy, the size is 20×20×7mm block. Perform surface mechanical pretreatment on the alloy: use 320# sandpaper to polish the oxide, and then further polish it on 1500# sandpaper. Rinse with distilled water, then alcohol, and dry with hot air. The cleaning solution is distilled water and alcohol, the operating temperature is kept at 30-40°C, and the processing time is about 10 minutes.

[0047] 2. Make a threaded hole on the surface of 20×7mm, with a diameter of 5mm and a depth of about 7mm, and connect the aluminum wire wrapped with insulation.

...

Embodiment 2

[0071] This embodiment relates to a method for micro-arc oxidation of an aluminum-lithium alloy and a method for preparing a micro-arc oxidation electrolyte. The micro-arc oxidation method is specifically:

[0072] 1. Prepare a sample of Al-2Li-2Cu-0.2Zr aluminum-lithium alloy in a block shape of 20×20×7mm. Perform surface mechanical pretreatment on the alloy: use 320# sandpaper to polish the oxide, and then further polish it on 1500# sandpaper. Rinse with distilled water, then alcohol, and dry with hot air. The cleaning solution is distilled water and alcohol, the operating temperature is kept at 30-40°C, and the processing time is about 10 minutes.

[0073] 2. Make a threaded hole on the surface of 20×7mm, with a diameter of 5mm and a depth of about 7mm, and connect the aluminum wire wrapped with insulation.

[0074]3. Prepare the solution in the stainless steel tank. The contents of each reagent are: sodium silicate 14g / L, potassium hydroxide 6g / L, sodium tungstate 4g / L,...

Embodiment 3

[0084] This embodiment relates to a method for micro-arc oxidation of an aluminum-lithium alloy and a method for preparing a micro-arc oxidation electrolyte. The micro-arc oxidation method is specifically:

[0085] 1. Prepare a sample of Al-2Li-2Cu-0.2Zr aluminum-lithium alloy in a block shape of 20×20×7mm. Perform surface mechanical pretreatment on the alloy: use 320# sandpaper to polish the oxide, and then further polish it on 1500# sandpaper. Rinse with distilled water, then alcohol, and dry with hot air. The cleaning solution is distilled water and alcohol, the operating temperature is kept at 30-40°C, and the processing time is about 10 minutes.

[0086] 2. Make a threaded hole on the surface of 20×7mm, with a diameter of 5mm and a depth of about 7mm, and connect the aluminum wire wrapped with insulation.

[0087] 3. Prepare the solution in the stainless steel tank. The contents of each reagent are: sodium silicate 15g / L, sodium hydroxide 6g / L, sodium tungstate 3.5g / L,...

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Abstract

The invention relates to the technical field of aluminum-lithium alloy surface treatment, and discloses an aluminum-lithium alloy micro-arc oxidation method and an electrolyte used therein. The micro-arc oxidation method of the aluminum-lithium alloy includes three steps of pre-treatment, micro-arc oxidation and post-treatment. The electrolyte used contains solute and solvent. The components are: sodium silicate 10-20g / L, strong base 6-10g / L, sodium tungstate 3-5g / L, additive 0.5-1g / L, solvent is ionized water. The invention increases the content of alkaline solute, promotes rapid micro-arc oxidation to form a film, and shortens the time required for processing. The solution has good stability, high reuse rate, low raw material cost, and can produce a film with a certain thickness and corrosion resistance in a short period of time. After 600 hours of full immersion corrosion, the surface film is still intact. , the alloy matrix remains intact; the electrochemical test shows that its corrosion current density can be reduced by nearly two orders of magnitude.

Description

technical field [0001] The invention relates to the technical field of surface treatment of aluminum-lithium alloys, and relates to a micro-arc oxidation technology aimed at improving the corrosion resistance of Al-Cu-Li alloys, in particular to a micro-arc oxidation method for aluminum-lithium alloys and the electrolyte used therein . Background technique [0002] Compared with traditional aluminum alloys (without lithium), aluminum-lithium alloys have lower density, higher elastic modulus and specific strength, and lower fatigue crack growth rate, and have broad applications in the aerospace industry. Application prospect. However, the higher activity of Li element leads to higher local corrosion susceptibility of Al-Li alloys such as intergranular corrosion and pitting corrosion, which becomes the main cause of corrosion failure of its structural parts, so it is necessary to use appropriate surface treatment to improve its corrosion resistance. [0003] Among many surf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/08C22C21/12C22C21/00
CPCC25D11/026C25D11/024C25D11/08C22C21/12C22C21/00
Inventor 秦莹吴国华张亮丁文江
Owner SHANGHAI JIAOTONG UNIV
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