An electrolyte and micro-arc oxidation process for the preparation of zirconium alloy cladding protective film

A technology of micro-arc oxidation and zirconium alloy, applied in the direction of electrolytic coating, surface reaction electrolytic coating, coating, etc., to achieve the effect of prolonging the service life, high production efficiency and simple process

Inactive Publication Date: 2016-05-11
BEIJING NORMAL UNIVERSITY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is still a lack of an electrolyte and micro-arc oxidation process for the preparation of zirconium alloy cladding protective film that can meet the use environment of nuclear reactor fuel rod cladding and the high temperature and high pressure corrosion protection requirements.

Method used

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  • An electrolyte and micro-arc oxidation process for the preparation of zirconium alloy cladding protective film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this example, the treated zirconium alloy cladding material is a Zr-1Nb sample. First of all, the sample is pretreated, and the treatment process is as follows: use 200#, 400#, 600#, 800# sandpaper to polish the surface of the sample; the polished sample is mechanically polished, and the polishing agent is emery; mechanical polishing Chemical polishing is carried out after completion, and the chemical polishing reagent is HF:H 2 SO 4 : HNO 3 :H 2 O=1:3:3:3 (volume ratio) polishing solution, polishing time 10s; after the chemical polishing is completed, use alcohol and ultrasonic cleaning, and finally, wash the surface of the sample with deionized water several times to remove the residue on the surface acid.

[0028] Put the chemically polished zirconium alloy into a vacuum furnace for thermal annealing treatment, the annealing temperature is 580° C., and the time is 2 hours.

[0029] Configure micro-arc oxidation electrolyte: the micro-arc oxidation electrolyte...

Embodiment 2

[0034]In the same way as in Example 1, the Zr-1Nb sample was subjected to surface pretreatment and annealing treatment, electrolyte solution was prepared, zirconium alloy was subjected to micro-arc oxidation treatment, and finally hole sealing treatment was performed. In the micro-arc oxidation treatment process, the operating frequency of the micro-arc oxidation power supply is 150Hz, the content of cerium nitrate in every liter of electrolyte is 2g, the content of glycerin is 5ml, the content of sodium hydroxide is 6g, and the content of potassium hydroxide The content is 4g. The forward voltage of micro-arc oxidation treatment was 400V, and the negative voltage was 40V for 20min. Preparation of electrolyte and micro-arc oxidation treatment of zirconium alloy, and finally sealing treatment.

[0035] Through the above steps, a zirconium alloy workpiece whose surface is covered with a uniform and smooth micro-arc oxidation film is finally obtained, which is designated as Z2. ...

Embodiment 3

[0037] The same method as in Example 1 was used to perform surface pretreatment and annealing treatment on Zr-1Nb, to prepare electrolyte and to perform micro-arc oxidation treatment on the surface of zirconium alloy, and finally to perform hole sealing treatment. In the micro-arc oxidation surface treatment process, the operating frequency of the micro-arc oxidation power supply is 150 Hz, the content of cerium nitrate per liter of electrolyte is 3g, the content of glycerin is 10ml, the content of sodium hydroxide is 8g, potassium hydroxide The content is 4g. For the micro-arc oxidation treatment, the positive voltage was 500V, and the negative voltage was 80V, and the treatment was carried out for 15 minutes under these conditions.

[0038] Through the above steps, a zirconium alloy workpiece whose surface is covered with a uniform and smooth micro-arc oxidation film is finally obtained, which is designated as Z3.

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Abstract

The invention discloses an electrolyte for micro-arc oxidation surface treatment of a Zr alloy cladding of a nuclear fuel rod. The electrolyte is a water solution containing rare earth salt, glycerin, sodium hydroxide and potassium hydroxide. The invention also discloses a preparation process of micro-arc oxidation film on surface of zirconium alloy cladding of the nuclear fuel rod, and the preparation process uses the electrolyte provided by the invention. Through the micro-arc technology provided by the invention, a layer of compact oxidation film is generated on the surface of a zirconium alloy cladding tube in advance, so as to corrosion resistance of the zirconium alloy cladding of the nuclear fuel rod in high temperature and high pressure water environment, and prolong the usage life of the nuclear fuel assemblies in a reactor.

Description

technical field [0001] The invention relates to an electrolyte and a process for preparing a protective film on the surface of nuclear fuel rod cladding by using micro-arc oxidation technology, which belongs to the field of zirconium alloy materials and material surface modification, and is mainly suitable for improving the temperature of nuclear fuel rod zirconium alloy cladding in high temperature and high pressure water. Corrosion resistance in the environment. Background technique [0002] Zirconium has a small thermal neutron absorption cross-section, good high-temperature water corrosion resistance and high-temperature mechanical properties, so zirconium alloys are widely used as cladding materials for nuclear fuel rods and structural components of reactor cores in nuclear power reactors. When zirconium alloy is used as the cladding of nuclear fuel, on the one hand, it is necessary to transfer the heat energy released during nuclear fuel fission to the coolant, and at ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/26
Inventor 薛文斌束国刚咸春宇王荣山邹志锋杜建成华铭施修龄刘彦章翁立奎贾兴娜
Owner BEIJING NORMAL UNIVERSITY
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