A high throughput test apparatus and method for simulating spent fuel reprocessing boiling nitric acid crevice corrosion

By designing a high-throughput testing device and combining wire beam electrodes with glass plates to form a three-electrode system with continuously changing gap width, the problem that existing technologies cannot conduct crevice corrosion research in a boiling concentrated nitric acid environment was solved, and efficient electrochemical testing and corrosion law research were achieved.

CN116297151BActive Publication Date: 2025-10-10INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202211646269.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-21
Publication Date
2025-10-10
Estimated Expiration
2042-12-21

AI Technical Summary

Technical Problem

Existing devices cannot meet the requirements for crevice corrosion research in a boiling concentrated nitric acid environment, especially the inability to combine continuously changing crevice width with wire beam electrodes, making it difficult to conduct high-throughput electrochemical tests.

Method used

A high-throughput testing device simulating crevice corrosion in boiling nitric acid during spent fuel reprocessing was designed. A wire beam electrode and a glass plate formed a continuously varying gap width, and electrochemical testing was performed in combination with a three-electrode system. Polytetrafluoroethylene was used to make the top screw, bolt, nut, and bottom bracket to ensure electrical insulation and corrosion resistance.

Benefits of technology

High-throughput electrochemical testing of crevice corrosion in a boiling concentrated nitric acid environment has been achieved. It can monitor the corrosion patterns under different crevice widths and integrate microelectrode signals to obtain the overall corrosion status of the material, meeting the experimental requirements of long-term high-temperature and high-corrosion environments.

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Abstract

The application relates to a high-throughput testing device and method for simulating the crevice corrosion of spent fuel reprocessing boiling nitric acid, and belongs to the field of spent fuel reprocessing boiling nitric acid corrosion testing devices. The device combines continuously changing crevice widths with wire beam electrodes, so that each rod-shaped sample corresponds to different crevice widths, and the crevice corrosion electrochemical signals under different crevice widths are monitored at one time. Therefore, the device can capture the corrosion signals of a micro area, obtain the corrosion rules under different crevice widths, complete high-throughput electrochemical testing, integrate the signals captured by each micro electrode, and obtain the corrosion condition of the whole material. Meanwhile, polytetrafluoroethylene is used as raw material to manufacture a top wire, a bolt, a nut and a bottom support in the device, the device has good electric insulation performance and strong corrosion resistance, and can meet the electrochemical experiment under a high-temperature concentrated nitric acid environment for a long time. The simulation and research of the crevice corrosion under the boiling concentrated nitric acid environment are realized.
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