Aluminum-lithium alloy micro-arc oxidation method and electrolyte adopted by same

A technology of micro-arc oxidation and aluminum-lithium alloy, applied in anodic oxidation, electrolytic coating, surface reaction electrolytic coating, etc., to achieve good stability, promote continuous growth, and reduce processing energy consumption

Active Publication Date: 2020-11-03
SHANGHAI JIAO TONG 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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  • Aluminum-lithium alloy micro-arc oxidation method and electrolyte adopted by same
  • Aluminum-lithium alloy micro-arc oxidation method and electrolyte adopted by same
  • Aluminum-lithium alloy micro-arc oxidation method and electrolyte adopted by same

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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 adopted by the same. Thealuminum-lithium alloy micro-arc oxidation method comprises three steps of pretreatment, micro-arc oxidation and aftertreatment. The adopted electrolyte comprises solute and a solvent, and comprisesthe following components including 10-20 g/L of sodium silicate, 6-10 g/L of strong base, 3-5 g/L of sodium tungstate and 0.5-1 g/L of an additive, and deionized water is used as the solvent. According to the aluminum-lithium alloy micro-arc oxidation method and the electrolyte, the content of the alkaline solute is increased, micro-arc oxidation is promoted to quickly form a film, and the time required by processing is shortened. The solution is good in stability, high in repeated utilization rate and low in cost of used raw materials, a film layer with a certain thickness and corrosion resistance can be prepared within a short time, after 600-hour complete soaking corrosion, the surface film layer is still complete, and an alloy matrix is kept intact; and an electrochemical test shows that the corrosion current density can be reduced by nearly two orders of magnitudes.

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 prospects. 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 sur...

Claims

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Application Information

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Patent Type & Authority Applications(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 JIAO TONG UNIV
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