An Analytical Method for Nucleation of Metal Hydrides Containing Surface Oxide Layers

Abstract

The invention discloses a method for analyzing nucleation of metal hydrides containing surface oxide layers. The method includes the following steps: first, the metal sample to be tested is loaded into the reaction chamber, and then hydrogen / deuterium gas is introduced into the chamber, and the small-angle neutron scattering test is carried out at the same time during the process, and the small-angle scattering experimental data are processed to obtain the absolute Intensity scattering curve, the critical point of hydride nucleation can be judged by the time of absolute scattering intensity increase. The analytical method of metal hydride nucleation containing surface oxide layer of the present invention provides a sensitive initial hydride nucleation measurement method, which can be used for the evaluation of surface hydrogenation reactions of real metal materials (surface containing oxide layer, damage, impurities, etc.) . The nucleation of the metal hydride containing the surface oxide layer observed by the invention is the key process of the actual metal hydrogenation reaction, and can be used for evaluating the hydrogen corrosion resistance of metals and optimizing the activation process of hydrogen storage materials.

Description

technical field [0001] The invention belongs to the application field of nuclear technology, and in particular relates to an analysis method for the nucleation of metal hydrides containing surface oxide layers. Background technique [0002] Interactions of metals with hydrogen are common in industry. Hydrogen embrittlement caused by hydrogen corrosion will affect the service life of metal pipelines and cause serious safety hazards. Some active metals are prone to surface corrosion during long-term storage, and the corrosion products will lead to a decrease in the mechanical properties of the material, and the corrosion products are flammable, which brings safety hazards to the processing and production of materials. The development of hydrogen storage alloys requires rapid hydrogen charging but is often limited by activation conditions. All the above problems are related to the generation and evolution of hydrides. The hydride nucleation process in the initial stage of the...

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

In addition, an oxide layer will inevitably form on the surface of actual metal materials, and the oxide will seriously interfere with the measurement results based on electron and X-ray probe techniques

[0004] Compared with pure metals, the hydrogenation reaction of metals with surface oxide layers is very complicated, which restricts the application of metal materials in hydrogen-containing atmospheres

However, the existing methods for observing the nucleation process of hydrides cannot meet the measurement requirements of metal hydride reactions that are close to the actual state (the surface contains oxide layers, damage, impurities, etc.), and new testing methods need to be developed

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