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Electrochemical polishing method for metallic uranium

An electrochemical and metal uranium technology, applied in the field of surface treatment, can solve problems such as shortening polishing time, and achieve the effects of shortening polishing time, fast polishing speed and improving polishing effect

Inactive Publication Date: 2019-01-18
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of gas precipitation in the existing electrochemical polishing process of uranium metal, and provide a method for electrochemical polishing of uranium metal. The parameters and processes in the chemical polishing process have been optimized, so that metal uranium no longer precipitates gas during the electrochemical polishing process, thereby not only improving the current utilization rate, shortening the polishing time, but also avoiding metal uranium. Excessive erosion reduces the loss of metal uranium. The electrochemical polishing method of the present invention has fast polishing speed and good effect, and the process is simple. It can be carried out at room temperature and has a positive effect on the application of metal uranium

Method used

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  • Electrochemical polishing method for metallic uranium
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  • Electrochemical polishing method for metallic uranium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Pretreatment: Grind the metal uranium sheet successively with 600#, 800#, 800#, 1000#, 1200# water-grinding sandpaper (such as figure 1 shown), then ultrasonically cleaned in absolute ethanol, and finally dried with Ar gas and stored in a low-humidity hypoxic glove box (both moisture and oxygen content were below 1 ppm);

[0032] (2) Electrochemical polishing: the pretreated metal uranium substrate is used as the anode, and the Al plate is used as the cathode; 3 Electrochemical polishing was carried out in the prepared polishing solution; the temperature of the polishing solution was 40 °C, the electrochemical polishing time was 10 min, and the current density was 17 mA / cm 2 , the stirring rate of the polishing liquid is 400 r / min;

[0033] (3) Post-treatment: Rinse the electrochemically polished metal uranium sheet in the polishing solution for 3 times, take it out after power off, and wipe until the surface of the uranium sheet reveals a metallic luster, that is,...

Embodiment 2

[0035] (1) Pretreatment: The metal uranium slices are successively polished with 500#, 600#, 800#, 1000#, and 1200# water-grinding paper, then ultrasonically cleaned in absolute ethanol, and finally cleaned with N 2 Air-dried and stored in a low-humidity hypoxic glove box (moisture and oxygen content are both lower than 1 ppm);

[0036](2) Electrochemical polishing: the pretreated metal uranium substrate is used as the anode, and the Pt plate is used as the cathode; 3 Electrochemical polishing was carried out in the prepared polishing solution; the temperature of the polishing solution was 80 °C, the electrochemical polishing time was 20 min, and the current density was 6 mA / cm 2 , the stirring rate of the polishing liquid is 600 r / min;

[0037] (3) Post-treatment: Rinse the electrochemically polished metal uranium slices in the polishing solution for 2 times, take them out after power off, and wipe until the surface of the uranium slices reveals a metallic luster, and then t...

Embodiment 3

[0039] (1) Pretreatment: Grind the metal uranium sheet with 800# water, then wash it in absolute ethanol, and finally dry it with Ar gas and place it in a low-humidity hypoxic glove box (the water and oxygen content are both lower than 1 ppm);

[0040] (2) Electrochemical polishing: the pretreated uranium metal substrate is used as the anode, and the Al plate is used as the cathode; 3 Electrochemical polishing was carried out in the prepared polishing solution; the temperature of the polishing solution was 15 °C, the electrochemical polishing time was 5 min, and the current density was 30 mA / cm 2 , the stirring rate of the polishing solution is 50 r / min;

[0041] (3) Post-treatment: Rinse the electrochemically polished metal uranium sheet in the polishing solution once, then take it out after power off, and wipe until the surface of the uranium sheet reveals a metallic luster, that is, the polished metal uranium sheet is obtained.

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Abstract

The invention discloses an electrochemical polishing method for metallic uranium. The electrochemical polishing method comprises three steps of preprocessing, electrochemical polishing and post-processing. As polishing solution in targeted preparation is selected, and as parameters and process during electrochemical polishing process is optimized in a targeted way, metallic uranium does not separate gas during electrochemical polishing process, thereby improving current utilization and shorten polishing time; and meanwhile, excessive corrosion of metallic uranium is avoided and the loss of metallic uranium is reduced. The electrochemical polishing method provided by the invention is fast in polishing speed, good in effect, simple in process, and can be carried out at room temperature, thus, the active effect on the application of metallic uranium is promoted.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to an electrochemical polishing method for metal uranium. Background technique [0002] Metal uranium is a natural radioactive element with the element symbol U, and it is one of the most important raw materials for the nuclear industry. During the production and use of uranium metal, in order to achieve the purpose of removing the surface mechanical damage layer and preparing metallographic samples, it is usually required to be polished. The use of traditional mechanical polishing will produce a large amount of radioactive and toxic uranium aerosol during the polishing process, resulting in the large-scale diffusion of uranium radioactivity and toxicity, which seriously endangers the environment and human safety. Therefore, the use of safer electrochemical polishing It is a conventional polishing method for metal uranium. [0003] Electrochemical polishing is also calle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/28
CPCC25F3/28
Inventor 丁晶晶江奕东方立平邓舜杰
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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