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Corrosion resistance testing method for neutron adsorption material

A technology of absorbing materials and test methods, applied in the direction of weather resistance/light resistance/corrosion resistance, analytical materials, measuring devices, etc., can solve the problem of not considering the impact of installation crevice corrosion, etc.

Active Publication Date: 2019-04-16
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the working conditions of composite materials and other metals have not been designed into the design, and the influence of factors such as installation gaps and possible scratches on corrosion has not been considered.

Method used

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  • Corrosion resistance testing method for neutron adsorption material
  • Corrosion resistance testing method for neutron adsorption material
  • Corrosion resistance testing method for neutron adsorption material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] B prepared by a liquid stirring method 4 C / Al composite finely ground plate samples were subjected to the aforementioned corrosion test, B 4 The C content is 31 wt.%. The corrosion conditions are: boric acid aqueous solution containing 2500ppm of boron is used as the corrosion medium, the temperature is 90.5°C, the first test tool is selected, and its material is 304L stainless steel. The experiment lasts for 4000 hours, and 4 samples are taken from the same group.

[0070] The dry weight of this group of samples after corrosion decreased by an average of 0.12%, and the thickness change was calculated as the average value of the four corners, the midpoints of the four sides and the central part, and the thickness decreased by an average of 0.05mm, and no obvious corrosion occurred in the samples. The surface of the sample is off-white, and some corrosion products are still attached.

Embodiment 2

[0072] will be a B 4 B with C content 15wt.% 4 The above-mentioned corrosion test was carried out on the rolled plate samples of the C / Al composite material after anodic oxidation. The corrosion conditions were: boric acid aqueous solution containing 2500ppm of boron was used as the corrosion medium, the temperature was 90.5°C, and the second test tool was selected, and its material was 304L Stainless steel, the experiment lasted for 8000 hours, 4 samples were taken from the same group of samples, and scratches were applied on the surface of the samples.

[0073] After corrosion, the dry weight of this group of samples decreased by an average of 5.33%, and the thickness change was calculated based on the average value of the four corners, the midpoints of the four sides and the center, and the average thickness decreased by 0.32mm. The samples had obvious pitting corrosion, and concentrated on the four corners and scratches of the samples. , obvious peeling occurred near the ...

Embodiment 3

[0075] A powder metallurgy prepared B 4 B with a C content of 31wt.% 4The above-mentioned corrosion test was carried out on the finely ground sample of C / Al composite material. The corrosion conditions were: boric acid aqueous solution containing 2500ppm of boron was used as the corrosion medium, the temperature was 90.5°C, the second test tool was selected, and its material was 304L stainless steel. The same group of samples was sampled 4.

[0076] The dry weight of this group of samples decreased by an average of 4.74% after corrosion, and the thickness change was averaged at the four corners, the midpoints of the four sides and the center, and the thickness increased by an average of 0.5mm. The samples were obviously corroded and swollen. A large number of pitting corrosion occurred on the surface of the sample, and some corrosion products were still attached.

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Abstract

The invention relates to the technical field of material corrosion testing, and discloses a corrosion resistance testing method for a neutron adsorption material. The method comprises the following steps that: preparing the sample of a neutron adsorption material to be tested; carrying out preliminary treatment on the sample, and carrying out weighing and size measurement on the sample; arranginga test tool, and fixing the sample on the test tool, wherein the test tool can simulate the galvanic corrosion and crevice corrosion service environment of the sample; preparing a corrosion medium, wherein the corrosion medium is boric acid aqueous solution; putting the test tool fixed with the sample in the corrosion medium to carry out corrosion testing; and after the corrosion testing is finished, carrying out aftertreatment on the sample, and carrying out weighing and size measurement on the sample, wherein test tool arrangement and corrosion medium preparation are not in a particular order. By use of the above method, the service condition of the neutron adsorption material can be simulated, various types of corrosion are observed, and therefore, the corrosion performance of the neutron adsorption material under the service condition can be comprehensively evaluated.

Description

technical field [0001] The invention relates to the technical field of material corrosion testing, in particular to a method for testing the corrosion resistance of neutron absorbing materials. Background technique [0002] After the nuclear power plant is put into operation, a large amount of spent fuel will be produced. It is necessary to use neutron absorbing materials to ensure that the spent fuel is in a subcritical safe state and prevent the release of radioactive substances into the environment to ensure the safety of the spent fuel. During the long-term service of spent fuel storage pools, neutron absorbing materials and components containing them will undergo uniform corrosion and localized corrosion (mainly pitting) due to the influence of the storage medium. The service life of the material and components containing it is measured in years, and the planned service life is nearly 70 years. However, parts with poor anti-corrosion performance often suffer from corro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00
CPCG01N17/00
Inventor 李丘林束国刚刘伟王靓李承亮
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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