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A method for improving corrosion resistance and surface hardness of zirconium alloy

A technology of surface hardness and corrosion resistance, which is applied in the field of zirconium alloy materials, can solve problems such as the turning point of corrosion kinetics, the deterioration of the corrosion resistance of zirconium alloys, and accelerated corrosion, so as to improve the surface hardness, corrosion resistance and hardness, Effect of improving corrosion resistance

Active Publication Date: 2020-03-31
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In previous studies, the deterioration of the corrosion resistance of zirconium alloys was mainly caused by the transformation of tetragonal zirconia to monoclinic zirconia in the oxide film. Transforms to loose equiaxed crystals and produces microcracks, providing more channels for the diffusion of oxygen ions, accelerating corrosion and causing a turning point in corrosion kinetics

Method used

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  • A method for improving corrosion resistance and surface hardness of zirconium alloy
  • A method for improving corrosion resistance and surface hardness of zirconium alloy
  • A method for improving corrosion resistance and surface hardness of zirconium alloy

Examples

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Effect test

Embodiment 1

[0032] Select a plate-shaped ZIRLO alloy sample with a size of 10mm×8mm, first use 400#, 800#, 1000#, 2000# and 3000# sandpaper to polish the surface of the workpiece sample, and then use 10% hydrofluoric acid in the volume ratio Pickling is carried out in the pickling solution of +30% nitric acid +30% sulfuric acid +30% water, and the pickling time is 15s. Immediately after pickling, wash the surface of the workpiece sample with water for 20 seconds to remove residual acid, then ultrasonically clean it in acetone for 10 minutes, and finally dry the surface of the workpiece sample. After drying, there is no residue on the surface of the workpiece sample. Such as figure 1As shown, the workpiece sample after the surface cleaning treatment is installed on the fixture and installed on the sample stage 5, the height of the sample stage 5 is lowered, and the workpiece sample is completely immersed in the water tank 4 with a quartz window filled with pure water, and it is guaranteed ...

Embodiment 2

[0038] Select a plate-shaped ZIRLO alloy sample with a size of 10mm×8mm, first use 400#, 800#, 1000#, 2000# and 3000# sandpaper to polish the surface of the workpiece sample, and then use 8% hydrofluoric acid in the volume ratio Pickling is carried out in the pickling solution of +33% nitric acid + 26% sulfuric acid + 33% water, and the pickling time is 18s. Immediately after pickling, wash the surface of the workpiece sample with water for 20 seconds to remove residual acid, then ultrasonically clean it in acetone for 12 minutes, and finally dry the surface of the workpiece sample. After drying, there is no residue on the surface of the workpiece sample. Such as figure 1 As shown, the workpiece sample after the surface cleaning treatment is installed on the fixture and installed on the sample stage 5, the height of the sample stage 5 is lowered, and the workpiece sample is completely immersed in the water tank 4 with a quartz window filled with pure water, and it is guarantee...

Embodiment 3

[0044] Select a plate-shaped ZIRLO alloy sample with a size of 10mm×8mm, first use 400#, 800#, 1000#, 2000# and 3000# sandpaper to polish the surface of the workpiece sample, and then use 12% hydrofluoric acid by volume Pickling is carried out in the pickling solution of +28% nitric acid + 32% sulfuric acid + 28% water, and the pickling time is 14s. Immediately after pickling, wash the surface of the workpiece sample with water for 20 seconds to remove residual acid, then ultrasonically clean it in acetone for 8 minutes, and finally dry the surface of the workpiece sample. After drying, there is no residue on the surface of the workpiece sample. Such as figure 1 As shown, the workpiece sample after the surface cleaning treatment is installed on the fixture and installed on the sample stage 5, the height of the sample stage 5 is lowered, and the workpiece sample is completely immersed in the water tank 4 with a quartz window filled with pure water, and it is guaranteed There a...

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Abstract

The invention discloses a method for improving the corrosion resisting performance and the surface hardness of a zirconium alloy. After the surface of a zirconium alloy material is cleaned and treated, clamping is performed, the zirconium alloy material is completely soaked in a water tank containing purified water, and the water tank is provided with a quartz window and right faces a light outgoing port of a laser device; the pulse laser device is started, a voltage is loaded, and impacting strengthening treatment is performed on the surface of a sample; a specific parameter range of laser surface treatment is that laser energy is 50-600 mJ, the wavelength is 532 nm, the repeating frequency is 10 Hz, the pulse width is 8 nm, the scanning speed is 0.1-5 mm / s, and the light spot diameter is0.5-4 mm; and after completing, the sample after being subjected to laser strengthening treatment is taken out. According to the method, a compact oxidization layer is generated on the surface of thezirconium alloy, an ultrafine grain structure modified layer is obtained, and after laser treatment, large remaining stress exists in a base body; and a generated oxidization film can effectively prevent diffusion of oxygen ions, tetragonal phase zirconia in the oxidization layer can be stabilized by the remaining stress, the corrosion resisting performance of the zirconium alloy is improved, theultrafine grain structure modified layer can improve the surface hardness of the zirconium alloy, and therefore the zirconium alloy has better comprehensive performance.

Description

technical field [0001] The invention relates to the field of zirconium alloy materials. Specifically, the invention relates to a method for improving the corrosion resistance and surface hardness of zirconium alloys by using pulsed laser surface treatment. Background technique [0002] Zirconium alloys are widely used in nuclear reactor core fuel cladding materials and structural materials due to their low neutron absorption cross-section, good high-temperature water corrosion resistance, excellent high-temperature mechanical properties, and radiation resistance. Metal of the Age". Zirconium alloys, as fuel cladding materials and structural materials, are used in extremely harsh environments in reactors, and there are still many problems with zirconium alloy claddings under reactor operating conditions. First of all, corrosion will occur in a high temperature water environment. On the one hand, corrosion will generate hydrogen gas, and hydrogen embrittlement will occur whe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C21D10/00
Inventor 柳文波刘俊凯恽迪单建强葛莉吴攀
Owner XI AN JIAOTONG UNIV