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Neutron small angle scattering loading device for studying metal surface hydrogen corrosion

A small-angle scattering, metal surface technology, used in measuring devices, material analysis using wave/particle radiation, instruments, etc., can solve problems such as inability to meet, destroy, and do not consider hydrogen loading, and achieve reduced size, simple sealing structure, The effect of reducing interference

Active Publication Date: 2018-09-04
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Secondary ion mass spectrometry can obtain local hydrogen distribution, but it is a destructive test and cannot be dynamically observed
The Chinese patent literature database has published a patent (ZL201510224536.6) titled "A Hot Stage for Small-Angle Scattering Experiments". This patent is a small-angle scattering in-situ heating device, which is a general-purpose in-situ Although the temperature loading equipment also has the function of gas loading, it cannot solve the problem of signal acquisition of hydrides on the metal surface, nor does it consider a series of problems faced by hydrogen loading, and cannot meet the neutron small angle scattering experiment requirements of hydrogen corrosion on the metal surface

Method used

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  • Neutron small angle scattering loading device for studying metal surface hydrogen corrosion
  • Neutron small angle scattering loading device for studying metal surface hydrogen corrosion
  • Neutron small angle scattering loading device for studying metal surface hydrogen corrosion

Examples

Experimental program
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Effect test

Embodiment 1

[0039]The neutron beam size used in the small-angle neutron scattering experiment of this implementation example is 8mm, and the fluence rate is 2*10 5 cm -2 .s -1 .

[0040] In this implementation example, the inner diameter of the front shell 11 and the rear shell 12 of the hydrogen loading chamber is 20 mm, the outer diameter is 30 mm, and the material is made of hydrogen-resistant stainless steel; the diameter of the scattering window I13 and the scattering window II16 is 24 mm, and the material is selected Sapphire is connected to the front shell 11 and the rear shell 12 respectively by metal welding; the inner diameter of the metal gasket 14 is 20 mm, the outer diameter is 25 mm, and the material is copper; the total length of the inside of the hydrogen loading chamber along the direction of the neutron beam It is 5mm and the volume is about 1.6ml.

[0041] The diameter of the annular support frame 24 of the multi-piece sample holder in this embodiment is 19.9mm; the ...

Embodiment 2

[0047] The structure of this embodiment is the same as that of Embodiment 1, except that the material of the scattering window I13 and II16 is quartz; the total length of the inside of the hydrogen loading chamber along the direction of the neutron beam is 15mm, and the volume is about 7.4ml.

[0048] After the above implementation, the scattering signal of the hydride can be increased by 20 times during the neutron scattering experiment, and the scattering signal of the metal itself is obviously suppressed. Usually greater than 100mm), the interference signal generated by hydrogen drops to 13.3% during the experiment, the buffer tank has enough hydrogen to keep the experiment going on, and there will be no hydrogen leakage problem under high temperature and high pressure loading, and the selected material is When it is warm, it will not decompose and release gas, which will interfere with the reaction of metal and hydrogen.

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Abstract

The invention discloses a neutron small angle scattering loading device for studying metal surface hydrogen corrosion. The device realizes the flaky sample overlapping by using a multi-flake sample clamp; the small angle scattering signals in hydrides are increased; meanwhile, the uniform loading of the hydrogen gas is ensured; the dimension of a hydrogen loading cavity can be optimized in modes of metal welding and metal gaskets; the high-temperature and high-pressure loading of hydrogen gas is guaranteed; the interference of the hydrogen gas on the neutron small angle scattering experiment can be obviously reduced; a buffer tank and a pressure monitor matched with the hydrogen loading cavity achieve the effects of maintaining the experiments and feeding back hydrogen pressure. The devicehas the advantages that the problems of interference on experiment precision and high-temperature and high-pressure hydrogen leakage are simultaneously solved when the neutron small angle scatteringsignals of the metal surface hydrogen corrosion are effectively obtained. The device is combined with a neutron small angle scattering technology; the microstructure change of the active metal in thehydrogen corrosion process can be studied in situ; the defects of a conventional method in an aspect of the hydrogen corrosion early period microstructure analysis can be overcome.

Description

technical field [0001] The invention belongs to the field of metal corrosion research, in particular to a neutron small-angle scattering loading device for studying hydrogen corrosion on metal surfaces. Background technique [0002] Hydrogen has a significant impact on the industrial application of metal materials. When stored in a small amount of hydrogen atmosphere for a long time, highly active metals are prone to surface corrosion. Compared with oxidation corrosion, hydrogenation corrosion reactions are more severe and accompanied by significant volume expansion. The products are flammable and easy to cause The degradation of mechanical properties and safety risks of materials have attracted the attention of researchers. The key process of metal hydrogenation corrosion is the nucleation of hydrides in the early stage of the reaction, and the study of its evolution is the prerequisite for revealing the mechanism of hydrogenation corrosion and controlling the corrosion res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/202G01N23/20008
CPCG01N23/20008G01N23/202Y02E30/30
Inventor 闫冠云纪和菲邹林陈杰孙良卫彭梅孙光爱史鹏汪小琳
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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