Preparation method for hydrogen-resistant coating on surface of zirconium hydride

A technology of zirconium hydride and hydrogen resistance, applied in the direction of surface reaction electrolytic coating, coating, electrolytic coating, etc. Significant hydrogen effect, good compactness, good hydrogen precipitation effect

Active Publication Date: 2014-01-01
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

O by in situ oxidation 2 , CO 2 , H 2 An oxide hydrogen barrier coating can be prepared on the surface of zirconium hydride under atmospheric conditions such as O steam, but the thickness of the coating obtained by this method is relatively thin, and the actual hydrogen barrier effect is not ideal
A continuous hydrogen barrier coating with a certain thickness can be prepared on the surface of zirconium hydride by micro-arc oxidation method, but the coating prepared by this method has a porous structure and there are microcracks on the coating surface, which affects the hydrogen barrier effect of the coating

Method used

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  • Preparation method for hydrogen-resistant coating on surface of zirconium hydride
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  • Preparation method for hydrogen-resistant coating on surface of zirconium hydride

Examples

Experimental program
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Effect test

Embodiment 1

[0037] ZrH 1.8 Cut the raw material into Φ20mm×2mm thin slice samples. Use 360#, 600#, 800# and 1000# SiC water sandpaper to mechanically polish the surface and edges of the sample step by step; place the sample in an acetone solution for ultrasonic cleaning for 10 minutes, and then clean it with deionized water to remove residual residues on the sample surface. Acetone solution, dry.

[0038] Such as figure 1 As shown, a WHD30 power supply 1 is added to the stainless steel electrolytic cell 3, and the sample 1 of zirconium hydride is placed as an anode in the stainless steel electrolytic cell 3 filled with electrolyte for micro-arc oxidation treatment. There is a thermometer 7 in the stainless steel electrolytic cell 3 The temperature is indicated, and the stirrer 4 controlled by the motor 6 is used for stirring, and the stainless steel electrolytic cell 3 is passed with circulating water 5 . Adjust the concentration of sodium hydroxide in the electrolyte to 0.5g / L, the co...

Embodiment 2

[0041] ZrH 1.8 Cut the raw material into Φ20mm×2mm thin slice samples. Use 360#, 600#, 800# and 1000# SiC water sandpaper to mechanically polish the surface and edges of the sample step by step; place the sample in an acetone solution for ultrasonic cleaning for 5 minutes, and then wash it with deionized water to remove residual residues on the sample surface. Acetone solution, dry.

[0042] Zirconium hydride is used as an anode and placed in a stainless steel electrolytic cell filled with electrolyte for micro-arc oxidation treatment. Adjust the concentration of sodium hydroxide in the electrolyte to 10g / L, the concentration of sodium polyphosphate to 2g / L, Na 2 EDTA concentration is 4g / L. The parameters of the micro-arc oxidation power supply are set as follows: positive voltage is 500V, negative voltage is 400V, frequency is 500Hz, processing time is 60min, and the temperature of the micro-arc oxidation electrolyte is controlled at room temperature. A mixed solution of ...

Embodiment 3

[0045] ZrH 1.8 Cut the raw material into Φ20mm×2mm thin slice samples. Use 360#, 600#, 800# and 1000# SiC water sandpaper to mechanically polish the surface and edges of the sample step by step; place the sample in acetone solution for ultrasonic cleaning for 20 minutes, and then clean it with deionized water to remove residual residues on the sample surface. Acetone solution, dry.

[0046] Zirconium hydride is used as an anode and placed in a stainless steel electrolytic cell filled with electrolyte for micro-arc oxidation treatment. Adjust the concentration of sodium hydroxide in the electrolyte to 2g / L, the concentration of sodium polyphosphate to 16g / L, and the concentration of Na 2 EDTA concentration is 2g / L. The parameters of the micro-arc oxidation power supply are set as follows: the forward voltage is 400V, the negative voltage is 150, the frequency is 200Hz, the processing time is 30min, and the temperature of the micro-arc oxidation electrolyte is controlled at r...

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Abstract

The invention relates to a preparation method for a hydrogen-resistant coating on the surface of zirconium hydride. The method is characterized in that a micro-arc oxidation and chemical solution precipitation and hole sealing combined technology is adopted for the preparation of a continuous and compact hydrogen-resistant coating on the surface of the zirconium hydride. According to the invention, a phosphate electrolyte system is adopted, and a zirconia ceramic layer is prepared on the surface of the zirconium hydride through micro-arc oxidation firstly, then a chemical solution method is adopted for hole sealing, and finally, a perfectly repaired zirconia hydrogen-resistant coating is prepared on the surface of the zirconium hydride. By utilizing the preparing method, the zirconia ceramic layer with the continuous and integral surface and the thickness bigger than 50 mum is prepared on the surface of the zirconium hydride; the zirconia ceramic layer is remarkable in hydrogen-resistant effect and better in high-temperature oxidation resistance.

Description

technical field [0001] The invention relates to a method for preparing a hydrogen-resistant coating on the surface of zirconium hydride, in particular to a composite process for sealing pores of a micro-arc oxidation porous zirconia ceramic layer on the surface of zirconium hydride by chemical solution deposition, and belongs to the technical field of material surface protection . Background technique [0002] The nuclear reactor power supply using zirconium hydride as moderator has attracted increasing attention because it can provide long-term reliable energy with high power level. Zirconium hydride has high hydrogen density, low neutron capture cross section, negative temperature coefficient, high thermal stability, good thermal conductivity and processability, and is an ideal solid neutron moderator material. However, there is a problem of hydrogen precipitation in the working temperature range of zirconium hydride, which reduces the neutron moderation efficiency and se...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26G21C5/12
CPCY02E30/40Y02E30/30
Inventor 陈伟东闫淑芳刘向东王志刚范秀娟张亚增闫国庆车广东
Owner INNER MONGOLIA UNIV OF TECH
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