Chemical passivation method of beryllium material

A treatment method and chemical passivation technology, applied in the direction of metal material coating process, etc., can solve the problems of inconsistent corrosion resistance, corrosion of parts, high risk, etc., and achieve the effect of strong operability and simple process composition.

Active Publication Date: 2014-06-18
BEIJING INST OF AEROSPACE CONTROL DEVICES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regarding the passivation of beryllium materials, foreign relevant data introduce that concentrated nitric acid is used for passivation. After passivation, colorless beryllium oxide is formed on the surface of beryllium, and its corrosion resistance can be increased by more than 4 times, but the formed film layer is poor in consistency. The degree of corrosion resistance is inconsistent. In addition, it is dangerous to use concentrated nitric acid in the passivation process. It is difficult to clean the residual nitric acid in the blind holes of the parts by general cleaning, which will cause corrosion to the parts. Therefore, nitric acid passivation is used for the product not the best way

Method used

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  • Chemical passivation method of beryllium material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Immerse the ultrasonically cleaned beryllium material test piece into the sodium hydroxide solution for chemical degreasing. The sodium hydroxide solution is prepared by dissolving 100g of sodium hydroxide in 1000mL of deionized water. During the degreasing process, keep the solution temperature at 25 Between ~ 30 ℃, carry out surface chemical degreasing, degreasing time 5min; immerse the degreasing beryllium material test piece in the weak etching solution for weak etching treatment, the weak etching time is 60s, the weak etching solution The temperature is 25°C, and the weak etching solution is prepared by dissolving 600mL of concentrated nitric acid in 400mL of deionized water; the activated beryllium parts are immersed in the passivation solution for passivation treatment, and the passivation solution It is prepared by dissolving 8g of chromium trioxide, 5g of potassium ferricyanide, 3g of sodium fluoride and 2mL of commercially available boric acid in 1000mL of deio...

Embodiment 2

[0034] Change the sodium hydroxide solution concentration and degreasing time in the chemical degreasing in embodiment 1, dissolve 80g sodium hydroxide in 1000mL deionized water and prepare, keep solution temperature in degreasing process and be 25~30 ℃, carry out surface Chemical degreasing, degreasing time 3min; All the other conditions are the same as in Example 1.

[0035] The obtained beryllium material test piece has a uniform bronze color on the surface of the passivation film, the film layer is uniform and continuous, the surface is dense, and the bonding force is good.

Embodiment 3

[0037] Change the weak etching time in Example 1, the etching time is 80s, and other conditions are the same as Example 1.

[0038] The obtained beryllium material test piece has a uniform bronze color on the surface of the passivation film, the film layer is uniform and continuous, the surface is dense, and the bonding force is good.

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Abstract

The invention relates to a chemical passivation method of a beryllium material, belonging to the technical field of surface processing of the beryllium material. The chemical passivation method comprises the following steps: (1) wiping the surface of a machined beryllium material with an organic solvent; (2) drying the organic solvent on the surface of the beryllium material wiped by the organic solvent by using a blower; (3) carrying out ultrasonic cleaning on the beryllium material obtained in the step (2) by using an alcoholic solution; (4) carrying out chemical deoiling on the surface of the beryllium material; (5) carrying out weak etching on the surface of the beryllium material; (6) carrying out surface passivation on the beryllium material, namely immersing the beryllium material subjected to weak etching into a passivation solution, and carrying out passivation for 10-20 minutes at 35-45 DEG C. The chemical passivation processing method is simple in process composition, strong in operability and capable of being used for large-scale industrial production.

Description

technical field [0001] The invention relates to a chemical passivation treatment method for beryllium material, belonging to the technical field of beryllium material surface treatment. Background technique [0002] Beryllium is a very unstable metal in thermodynamics. It can form a very thin oxide film when exposed at room temperature, and the thickness of this oxide film is about 10nm. The oxide film of beryllium is generally composed of two layers, the inner oxide film is an amorphous compact non-porous layer (also called barrier layer) near the metal surface, and the loose outer layer is slightly thicker than the inner layer. The inner oxide film is compressed on the surface of the beryllium material, which can form a dense protective film and inhibit slight corrosion. Therefore, the corrosion resistance of the beryllium material is very good in a dry atmosphere at room temperature. However, beryllium is susceptible to corrosion in humid atmospheric environments because...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/78C23C22/37
Inventor 朱志刚崔砚王长青薛凤举王长峰张锐钟声班建钢陈振鹏邓忠武
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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