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Metal material corrosion testing device and method under high-pressure densely-compacted bentonite environment

A technique for metal materials, corrosion testing

Inactive Publication Date: 2015-12-02
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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  • Metal material corrosion testing device and method under high-pressure densely-compacted bentonite environment
  • Metal material corrosion testing device and method under high-pressure densely-compacted bentonite environment
  • Metal material corrosion testing device and method under high-pressure densely-compacted bentonite environment

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Experimental program
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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, and particularly relates to a metal material corrosion testing device and method under a high-pressure densely-compacted bentonite environment. The metal material corrosion testing device comprises a high-pressure densely-compacted bentonite bearing cabin, as well as a bentonite compacting plate, a connection guide-out system, a three-electrode system and a seal plug which are arranged in the densely-compacted bentonite bearing cabin, wherein the bentonite compacting plate is connected with the high-pressure densely-compacted bentonite bearing cabin through the connection guide-out system, and is guided out of the densely-compacted bentonite bearing cabin through the connection guide-out system; the bentonite compacting plate is used for compacting bentonite loaded in the densely-compacted bentonite bearing cabin so as to prepare the densely-compacted bentonite; the seal plug is used for sealing the densely-compacted bentonite bearing cabin; and the three-electrode system is connected with an external electrochemical station through a lead for carrying out the testing on the metal material corrosion. The device and the method can truly simulate the deep geological environment in which a nuclear waste storage tank is buried, and the corrosion degree of the material of the storage tank in various burying stages can be obtained.

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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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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