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Beryllium aluminum alloy and preparing method thereof

A technology of beryllium aluminum alloy and mixed acid, which is applied in the field of beryllium aluminum alloy, can solve the problems of insufficient wear resistance, hardness and corrosion resistance, limit the application and limitation of beryllium aluminum alloy, and achieve strong corrosion resistance and electrical conductivity. The surface film layer is uniform and continuous, and the color is uniform and stable

Inactive Publication Date: 2018-02-27
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Beryllium aluminum alloy has the characteristics of light weight, high specific strength, high specific stiffness, good thermal stability, high toughness, and corrosion resistance. It combines many excellent characteristics such as low density of beryllium and easy processability of aluminum. It has broad application prospects in manufacturing, automotive fields and high-precision, high-speed electric welding machine manufacturing industries, and has become an increasingly important new material. Due to the inherent characteristics of the aluminum phase in the alloy, beryllium aluminum alloy has wear resistance The constraints of insufficient hardness and corrosion resistance limit the application of beryllium aluminum alloy
[0003] Existing anodic oxidation of beryllium aluminum alloy to enhance its anti-corrosion ability, such as CN104233429A discloses a method for anodic oxidation of beryllium aluminum alloy, including the following steps: (1) polishing the beryllium aluminum alloy; The old oxide film is removed, and it is clamped and in good contact with the fixture; (3) Wash with NaOH 20g / L alkali, the degreasing temperature is 80°C-85°C, and the time is 5s-10s; (4) Wash it with flowing hot water first, Then wash with flowing cold water; (5) emit light at room temperature for 3s~5s; (6) wash with deionized water for 0.5min~2min; (7) anodize: chromic anhydride 130g / L, boric acid 7g / L, temperature 5°C ~15℃, the time is 90min, the current density is 10~60A / dm 2 ; (8) Flowing cold water washing for 0.5min to 2min; (9) Hot water sealing or dichromate sealing to improve the corrosion resistance of the oxide film; (10) Flowing cold water washing for 0.5min to 2min; (11) Drying with high-pressure air Finally, remove the fixture; then spray paint; (12) Dry at a temperature of 70°C to 80°C for 24 hours. By oxidizing the beryllium-aluminum alloy, a better insulating oxide film can be obtained, which effectively prolongs the life of the beryllium-aluminum alloy. service life, but the insulating performance of the anodized film also limits its application

Method used

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preparation example Construction

[0023] Simultaneously, the present invention also provides the preparation method of the above-mentioned beryllium aluminum alloy. The steps include: subjecting the beryllium aluminum alloy precursor to be treated to S1, alkali washing; S2, pickling; S3, acid erosion; S4, chemical oxidation; The beryllium aluminum alloy is obtained by washing with water; the time for the chemical oxidation is 5-7 minutes, and the temperature is 25-30°C; the oxidation solution used for the chemical oxidation is chromic anhydride and sodium fluoride, and the chromic anhydride and sodium fluoride The mass ratio is 3-7:1-4.

[0024] The beryllium aluminum alloy prepared by special pretreatment and special oxidation conditions in the present invention has strong corrosion resistance and electrical conductivity, and the obtained surface film layer is uniform and continuous, without local non-film formation, no shedding, and no local hair loss. Powder, fading and other phenomena, the color is uniform...

Embodiment 1

[0036]The beryllium-aluminum alloy precursor to be treated is immersed in an alkaline washing solution for cleaning. The alkaline washing solution includes 30g / L sodium carbonate, 20g / L sodium phosphate and 30g / L sodium hydroxide, the temperature is 60°C, and the cleaning time is 10 Seconds, then cleaned with deionized water, then immersed in a mixed acid solution containing 100g / L sulfuric acid and 50g / L chromic anhydride for 5 seconds, then cleaned with deionized water, and then immersed in acid etching solution for 3 seconds, The acid etching solution is a mixed acid of 40wt% nitric acid and 10ml / L hydrofluoric acid, then cleaned with deionized water at room temperature, and then immersed in a chemical oxidation tank, the oxidation solution in the chemical oxidation tank is chromic anhydride and sodium fluoride, after 5min Rinse with hot water at 60°C for 1 min, take it out and dry it with compressed air at a pressure of 5kg, and then keep the temperature at 60°C for 10 min ...

Embodiment 2

[0038] Dip the beryllium-aluminum alloy precursor to be treated into an alkaline cleaning solution, the alkaline cleaning solution includes 30g / L sodium carbonate, 20g / L sodium phosphate and 30g / L sodium hydroxide, the temperature is 60°C, and the cleaning time is 20 Seconds, then cleaned with deionized water, then immersed in a mixed acid solution containing 100g / L sulfuric acid and 50g / L chromic anhydride for 10 seconds, then cleaned with deionized water, and then immersed in acid etching solution for 5 seconds, The acid etching solution is a mixed acid of 40wt% nitric acid and 10ml / L hydrofluoric acid, then cleaned with normal temperature deionized water, and then immersed in a chemical oxidation tank, the oxidation solution in the chemical oxidation tank is chromic anhydride and sodium fluoride, after 10min , washed with deionized water, then immersed in deionized water at 70°C for 2 minutes, dried with compressed air at a pressure of 5kg after taking it out, and then kept ...

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Abstract

The invention relates to the field of beryllium aluminum alloys and particularly discloses a beryllium aluminum alloy and a preparing method thereof. The beryllium aluminum alloy comprises a berylliumaluminum alloy base body and a chemical oxide film located on the surface of the beryllium aluminum alloy base body. The method includes the steps that firstly, a beryllium aluminum alloy precursor needing to be treated is subjected to alkaline washing; secondly, acid pickling is conducted; thirdly, acid etaching is conducted; fourthly, chemical oxidizing is conducted; and fifthly, the berylliumaluminum alloy is obtained after hot washing. The chemical oxidization time ranges from 5 min to 7 min, and the temperature ranges from 25 DEG C to 30 DEG C; oxidation liquid used in chemical oxidization is chromic anhydride and sodium fluoride, and the prepared beryllium aluminum alloy has high corrosion-resisting performance and electric conduction performance.

Description

technical field [0001] The invention relates to the field of beryllium aluminum alloys, in particular to a beryllium aluminum alloy and a preparation method thereof. Background technique [0002] Beryllium aluminum alloy has the characteristics of light weight, high specific strength, high specific stiffness, good thermal stability, high toughness, and corrosion resistance. It combines many excellent characteristics such as low density of beryllium and easy processability of aluminum. It has broad application prospects in manufacturing, automotive fields and high-precision, high-speed electric welding machine manufacturing industries, and has become an increasingly important new material. Due to the inherent characteristics of the aluminum phase in the alloy, beryllium aluminum alloy has wear resistance The constraints of insufficient hardness and corrosion resistance limit the application of beryllium aluminum alloy. [0003] Existing anodic oxidation of beryllium aluminum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/37
CPCC23C22/37
Inventor 张继真谢晓麟谭双龙王哈徐放姚远
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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