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Beryllium aluminum alloy and preparation method thereof

A technology of beryllium aluminum alloy and nickel phosphorus alloy, applied in the field of beryllium aluminum alloy and its preparation, to achieve the effect of bright surface

Active Publication Date: 2018-03-09
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

[0007] The present invention aims to overcome the technical problem that there is still no effective measure to electroless nickel-phosphorus plating on the surface of beryllium aluminum alloy, and provide a beryllium aluminum alloy with strong corrosion resistance and its preparation method, which is simple and easy to implement, and the obtained The surface of the nickel-phosphorus alloy coating is bright, uniform and continuous, without peeling, peeling, local roughness, etc.

Method used

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Examples

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preparation example Construction

[0020] At the same time, the present invention also provides a method for preparing 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, first zinc immersion; S5 , zinc stripping; S6, second zinc immersion; S7, alkaline pre-nickel plating treatment; S8, acidic electroless nickel-phosphorus alloy plating to obtain the beryllium aluminum alloy.

[0021] The present invention can well overcome the bonding force between the nickel-phosphorus coating and the substrate caused by the existence of the oxide film on the surface of the beryllium aluminum alloy by first alkali washing, then pickling, and then acid erosion, and then electroless nickel-phosphorus plating. Very poor, the deposited coating is prone to peeling, peeling and other undesirable phenomena. The method of the invention can better plate the nickel-phosphorus alloy on the surface of th...

Embodiment 1

[0031] Wipe the beryllium aluminum alloy precursor with acetone as a whole, and then immerse the beryllium aluminum alloy in alkali for cleaning at a temperature of 60°C for 10 seconds. The alkali is 30g / L sodium carbonate, 20g / L sodium phosphate and 30g / L sodium hydroxide , and then rinsed with deionized water. Then immerse the beryllium aluminum alloy in the mixed acid solution of sulfuric acid and chromic anhydride for 5 seconds, the acid is 100g / L sulfuric acid and 50g / L chromic anhydride, and then wash it with deionized water. Then immerse in the acid etching solution for 3 seconds, the acid etching solution is a mixed acid of 40wt% nitric acid and 10ml / L hydrofluoric acid, and then wash with normal temperature deionized water. Afterwards, immerse the beryllium aluminum alloy in the first zinc immersion solution for 15 seconds at a temperature of 22°C. The first zinc immersion solution contains zinc oxide, sodium hydroxide, potassium sodium tartrate, sodium nitrate and fe...

Embodiment 2

[0034] The beryllium aluminum alloy was prepared by the same steps as in Example 1, except that the washing temperature in alkali was 70°C and the time was 15°C.

[0035] The obtained nickel-phosphorus alloy coating has a bright, uniform and continuous surface without peeling, falling off, local roughness and the like. Referring to the standard "OB-T 3821-1999 Test Method for Bonding Strength of Metal Coatings of Light Industrial Products", heat the parts to 210°C and keep them warm for one hour, then take them out and immediately put them in clean water at 20°C, the coating has no bubbles and peeling The phenomenon.

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Abstract

The invention relates to the field of beryllium aluminum alloys and particularly discloses a beryllium aluminum alloy and a preparation method thereof. The beryllium aluminum alloy comprises a beryllium aluminum alloy matrix and a nickel-phosphorous alloy layer on the surface of the beryllium aluminum alloy matrix. The preparation method of the beryllium aluminum alloy comprises the steps of performing treatments on a beryllium aluminum alloy precursor including, S1, alkali washing, S2, acid pickling, S3, acid etching, S4, first zinc immersion, S5, zinc removal, S6, second zinc immersion, S7,alkaline nickel preplating and S8, acid chemical nickel-phosphorous alloy plating. The preparation method of the beryllium aluminum alloy can well plate nickel-phosphorous alloy on the surface of theberyllium aluminum alloy. The plated layer on the surface of the beryllium aluminum alloy is glossy, uniform, continuous in surface and free from peeling, falling-off, local roughness and the like.

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. [0003] The anti-corrosion treatment of the surface of aluminum or general aluminum alloy products can adopt electroless nickel-phosphorous plating. For example, CN102051605A discloses an anti-corrosion treatment method for the surface of aluminum or aluminum alloy products, which include...

Claims

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Application Information

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IPC IPC(8): C22C25/00C22C21/00C23C18/32C23C18/18
CPCC22C21/00C22C25/00C23C18/1841C23C18/32
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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