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A metal material corrosion test device and method in a high-compacted bentonite environment

A technology for corrosion testing and metal materials, which is applied in the field of metal material corrosion testing devices under high-pressure bentonite environment, can solve the problems of not being able to effectively represent the corrosion conditions of storage tanks and the difficulty of corrosion testing, so as to avoid changes in the concentration of underground aqueous solutions and facilitate The effect of compacting work and dismantling is convenient

Inactive Publication Date: 2017-12-26
INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to simulate the corrosion test under the environment of high compaction buffer backfill material after obtaining the trend of environmental evolution of the tank surface
At present, most of them are used to prepare pore fluid simulation fluid for buffering and backfilling materials under corresponding conditions, and adjust the temperature and oxygen content to conduct corrosion tests. The corrosion data obtained in this way cannot effectively represent the corrosion of storage tanks in deep geological disposal environments. There is a need for a method capable of simulating the corrosion testing of metallic materials in the environment of high compaction buffer backfill materials

Method used

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  • A metal material corrosion test device and method in a high-compacted bentonite environment
  • A metal material corrosion test device and method in a high-compacted bentonite environment
  • A metal material corrosion test device and method in a high-compacted bentonite environment

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preparation example Construction

[0041] 1) Preparation of bentonite with different saturations: Weigh a certain amount of bentonite as a buffer backfill material, bake it in an oven at a specific temperature to constant weight, calculate its initial moisture content, and place the dried soil sample in a desiccator for use; There is a certain correspondence between saturation and water content, and its different saturation can be expressed by its water content. According to the chemical composition of the groundwater in the pre-selected area of ​​the high-level radioactive waste storage, select the appropriate salt and dissolve it in double distilled water to prepare the groundwater solution with the required concentration, and adjust its pH with acid and alkali to obtain the groundwater solution prepared in the laboratory. Wet the dried bentonite with groundwater and maintain it by spraying method, and then obtain bentonite with different saturation;

[0042] 2) Preparation of high-compacted bentonite: use th...

Embodiment

[0047] Below in conjunction with exemplary embodiment of the present invention describe in more detail the corrosion test method of metal material under the environment of high compacted bentonite of the present invention, comprise the steps:

[0048] First of all, according to the chemical composition and content of the groundwater in the pre-selected area of ​​the high-level nuclear waste storage in my country, the groundwater solution for the laboratory is prepared, and the main salts include NaCl, Na 2 SO 4 , NaHCO 3 、NaNO 3 , CaCl 2 , MgSO 4 , KCl, etc., are dissolved step by step with double distilled water, and then adjusted to the average value of the region with acid or alkali. The laboratory prepares groundwater as the subsequent bentonite wetting solution.

[0049] Then dry the selected bentonite and store it in a dry box. According to the prediction curve of the relationship between the saturation of bentonite on the surface of the high-level radioactive nuclea...

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Abstract

The invention belongs to the field of corrosion electrochemical testing, in particular to a metal material corrosion testing device and method in a high-pressure bentonite environment. The device includes a high-compacted bentonite bearing cabin and a compacted soil sheet located in the high-compacted bentonite loaded cabin, a connection and export system, a three-electrode system and a sealing plug, and the compacted soil sheet is connected to the high-compacted bentonite bearing cabin through the connection and export system , and lead out from the high-compacted bentonite bearing cabin through the connection export system, the compacted soil sheet is used to compact the bentonite carried in the high-compacted bentonite bearing cabin to prepare high-compacted bentonite, and the sealing plug is used for all The sealing of the high-compacted bentonite bearing compartment is described, and the three-electrode system is connected to an external electrochemical workstation through wires to conduct corrosion tests on metal materials. The invention can truly simulate the deep geological environment where the nuclear waste storage tank is buried, and obtain the corrosion degree of the storage tank material in each burial stage.

Description

technical field [0001] The invention belongs to the field of corrosion electrochemical testing, in particular to a metal material corrosion testing device and method in a high-pressure bentonite environment. Background technique [0002] Since the 20th century, the continuous development of nuclear science and technology and the peaceful use of nuclear energy have become another innovative measure of mankind. However, the use of nuclear energy has brought a lot of nuclear waste disposal problems at the same time. At present, the internationally accepted and feasible solution is the deep geological disposal method, using storage tank materials to hold vitrified waste bodies, filling the outside with buffer backfill materials and placing them in the local surrounding rock. Since metal storage tanks are the first barrier to directly isolate high-level radioactive waste from the surrounding geological disposal environment and prevent leakage of high-level radioactive waste, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/02
Inventor 郑珉黄彦良余秀明路东柱
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI
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