Hydrogen permeability testing device for metal material under high liquid pressure

Abstract

The invention provides a hydrogen permeability testing device for a metal material under high liquid pressure, and belongs to the technical field of hydrogen permeability testing for materials. The device comprises an autoclave, an electrochemical workstation, a hydrogen charging device, a metal sheet specimen, a reference electrode, an auxiliary electrode and a thermocouple thermometer, wherein a high-elasticity film is embedded into an upper cover of the hydrogen charging device through a perforated plug valve, so that the elasticity of the film is utilized to eliminate the internal and external pressure difference, the liquid pressure intensity in a hydrogen charging chamber and a hydrogen diffusion chamber in the testing process can be kept balance, and meanwhile the two different liquids can be prevented from mixing. Therefore, the pressure intensity balance problem of different liquids in the hydrogen charging chamber and the hydrogen diffusion chamber under the high pressure can be solved; the device can be used for measuring the hydrogen permeability signals in the metal material electrochemical hydrogen charging process under the high liquid pressure; the anodic current density ia-time curves of various metal materials in the electrochemical hydrogen charging process under different liquid pressures, different temperatures and different hydrogen charging current densities can be tested and recorded, so that the material hydrogen induced cracking sensitivity can be further analyzed and evaluated through data processing.

Description

technical field [0001] The invention relates to the technical field of material hydrogen permeation testing, in particular to a device for testing the hydrogen permeation performance of metal materials under liquid high pressure. Background technique [0002] With the development of marine engineering technology, people's exploration and development of marine resources continue to advance to deeper seabeds. Since the structure and functional reliability of materials in the deep sea environment are much higher than those in land and shallow seas, any possible material corrosion damage may lead to serious engineering accidents in the deep sea environment. Therefore, the study of the influence of deep sea environment on the corrosion resistance of metal materials has received more and more attention. [0003] Hydrogen embrittlement or hydrogen-induced stress corrosion cracking of metal materials is an important aspect of studying the corrosion resistance of metal materials. Fo...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a device for testing the hydrogen permeation performance of metal materials under high liquid pressure, so as to solve the problem that the hydrogen permeation signal during the electrochemical hydrogen charging process of metal materials cannot be measured under high liquid pressure.

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