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

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...

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

Images