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Method and device for preparing anti-corrosion protective layer on uranium surface by atmospheric laser passivation

An anti-corrosion and laser technology, which is applied in the field of material and metal surface passivation film preparation, can solve the problems of uranium nitride film corrosion, limited workpiece size, and difficulty in meeting industrial production applications, so as to reduce procedures, reduce production costs, The effect of simplifying equipment and processes

Active Publication Date: 2017-12-15
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem that the uranium nitride film is prepared by laser nitriding, the size of the workpiece is limited, it is difficult to meet the needs of industrial production, and the prepared uranium nitride film will still be corroded to a certain extent. Method and device for preparing anti-corrosion protective layer on uranium surface by atmospheric laser passivation

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  • Method and device for preparing anti-corrosion protective layer on uranium surface by atmospheric laser passivation
  • Method and device for preparing anti-corrosion protective layer on uranium surface by atmospheric laser passivation
  • Method and device for preparing anti-corrosion protective layer on uranium surface by atmospheric laser passivation

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Embodiment 1

[0048] The steps of preparing the passivation protection layer are as follows:

[0049] 1) Open the quartz glass cover 1, place the uranium workpiece 3 on the workbench 2, and close the quartz glass cover 1;

[0050] 2) Turn on the pulse laser scanning system 4 to scan the laser on the surface of the workpiece, and the laser energy density is 20J / cm 2 , the laser overlap rate is 95%;

[0051] 3) After the laser scans the entire surface of the workpiece, turn off the laser scanner, open the glass cover, and take out the workpiece to obtain a passivation protective layer on the surface of the workpiece.

[0052] As determined by XRD: the passivation protection layer prepared in this embodiment is mainly composed of uranium dioxide and UN, and the content of uranium dioxide is much higher than that of UN, that is, the passivation protection layer is a uranium nitrogen oxide passivation film.

Embodiment 2

[0054] 1) Open the quartz glass cover 1, place the uranium workpiece 3 on the workbench 2, and close the quartz glass cover 1;

[0055] 2) Turn on the pulse laser scanning system 4 to scan the laser on the surface of the workpiece, and the laser energy density is 50J / cm 2 , the laser overlap rate is 90%;

[0056] 3) After the laser scans the entire surface of the workpiece, turn off the laser scanner, open the glass cover, and take out the workpiece to obtain a passivation protective layer on the surface of the workpiece.

[0057] As determined by XRD: the passivation protection layer prepared in this embodiment is mainly composed of uranium dioxide and UN, and the content of uranium dioxide is much higher than that of UN, that is, the passivation protection layer is a uranium nitrogen oxide passivation film.

Embodiment 3

[0059] 1) Open the quartz glass cover 1, place the uranium workpiece 3 on the workbench 2, and close the quartz glass cover 1;

[0060] 2) Turn on the pulse laser scanning system 4 to scan the laser on the surface of the workpiece, and the laser energy density is 70J / cm 2 , the laser overlap rate is 80%;

[0061] 3) After the laser scans the entire surface of the workpiece, turn off the laser scanner, open the glass cover, and take out the workpiece to obtain a passivation protective layer on the surface of the workpiece.

[0062] As determined by XRD: the passivation protection layer prepared in this embodiment is mainly composed of uranium dioxide and UN, and the content of uranium dioxide is much higher than that of UN, that is, the passivation protection layer is a uranium nitrogen oxide passivation film.

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Abstract

The invention discloses a method and a device for preparing a uranium surface anti-corrosion protecting layer through atmospheric laser passivation and aims to solve the problems that workpiece sizes are limited, demands of industrial production and application are hardly met and prepared uranium nitride films are still corroded to a certain degree in terms of current uranium nitride film preparation by laser nitridation. In the atmospheric environment, the workpiece surface is scanned through nanosecond pulse laser, the laser energy density is 20-70J / cm2, the overlapping ratio is 80%-95%, and therefore a uranium nitrogen oxygen passive film in a ceramic state is prepared on the workpiece surface. A vacuum environment and a special gas source are not required; machining demands of plane workpieces, abnormal-shaped workpieces and large workpieces can be met; the machining speed is high; the demands of the industrial application can be met. Meanwhile, the prepared uranium nitrogen oxygen passive film is excellent in corrosion resistance, pre-treatment of the workpiece surface is not needed; the quantity of generated wastes is small; environment-friendly effect is achieved. By means of the method and the device for preparing the uranium surface anti-corrosion protecting layer through atmospheric laser passivation, during workpiece machining, burrs of the workpiece surface can be removed, and the method and the device have good application prospects.

Description

technical field [0001] The invention relates to the field of materials, especially the field of passivation film preparation on metal surfaces, in particular to a method and a device for preparing an anti-corrosion protective layer on a uranium surface by atmospheric laser passivation. The invention forms an anti-corrosion protective layer on the surface of the uranium workpiece through nanosecond pulse laser passivation in the atmospheric environment, and the protective layer has excellent anti-corrosion performance. Background technique [0002] Metal uranium has special physical and chemical properties and nuclear properties, and has been widely used in military and national economic fields. However, the chemical nature of uranium is very active, and it is extremely vulnerable to corrosion by the ambient atmosphere, which not only affects normal use, causes waste of materials, increases the workload of the nuclear fuel cycle, but also poses a great risk of radiation hazar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/10
Inventor 陈志磊张永彬刘柯钊徐钦英王小英
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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