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Method for testing hydrogen diffusivity or permeability in metal and specific device therefor

A technology for testing device and penetration performance, applied in measurement devices, instruments, scientific instruments, etc., can solve the problems of test signal interference, low vacuum, affecting test accuracy, etc., and achieve the effect of improving test accuracy and accurate flow value

Inactive Publication Date: 2014-02-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the vacuum degree of the equipment is low, the residual hydrogen in the sample chamber cannot be quickly removed, resulting in a high background hydrogen concentration in the system, which will interfere with the test signal and affect the test accuracy

Method used

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  • Method for testing hydrogen diffusivity or permeability in metal and specific device therefor
  • Method for testing hydrogen diffusivity or permeability in metal and specific device therefor
  • Method for testing hydrogen diffusivity or permeability in metal and specific device therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0043] like figure 1 As shown, the device of the present invention consists of a sample chamber 1, a temperature control device 2, a pressure sensor 3, a hydrogen gas source 4, a vacuum system, a double spherical vacuum chamber, a quadrupole mass spectrometer 7, a standard hydrogen leak hole 8, a vacuum gauge 9. Composition of valves and pipelines;

[0044] There is a temperature control system 2 outside the sample chamber 1 (the temperature control system 2 in this embodiment is a temperature-controlled electric furnace), and the two ends of the sample chamber 1 are respectively connected to the molecular pump 5.1 with an oil-free mechanical pump 5.2 connected in series through pipelines, close to the molecular pump There is a valve a on the pipeline of 5.1, which is the main valve for initial vacuuming; a pressure sensor 3 and a hydrogen gas source 4 are connected to the pipeline between one end of the sample chamber 1 and the molecular pump 5.1, and the hydrogen gas source ...

Embodiment 2

[0060] Measure the hydrogen diffusion coefficient and permeability coefficient of CLF-1 alloy (Fe-9Cr-1W) steel:

[0061] Sample: Fe-9Cr-1W alloy, thickness 0.590mm, diameter 20mm, surface mechanically polished.

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Abstract

The invention aims to provide a method for testing hydrogen diffusivity or permeability in metal with higher accuracy, and a specific device therefor. The invention is characterized in that the device consists of a sample chamber, an evacuating system, a double-sphere-shaped vacuum chamber, a quadrupole mass-spectrometer, a hydrogen standard leak, a pressure testing system, a vacuum testing system and pipes, wherein both ends of the sample chamber are connected with the evacuating system through the pipes; one end of the sample chamber is connected with a hydrogen source; the pressure testing system is arranged between the sample chamber and the hydrogen source; the upper spherical vacuum chamber of the double-sphere-shaped vacuum chamber is respectively connected with the other end of the sample chamber, the hydrogen standard lead and the quadrupole mass-spectrometer; the lower spherical vacuum chamber of the double-sphere-shaped vacuum chamber is connected with the evacuating system.

Description

technical field [0001] The invention belongs to hydrogen testing instruments and equipment, and particularly provides a testing device for hydrogen diffusion (permeation) performance in metals. Background technique [0002] Hydrogen is the element with the smallest atomic weight in nature and exists in large quantities. It is widely used in the form of simple substance and various compounds in human production and life. During the preparation of metal materials, hydrogen may enter the interior of the material due to process factors and environmental factors. Due to the small atomic size, hydrogen readily exists and diffuses in metals. In some high-strength steels and special-purpose steels, such as steels used in the petrochemical industry, the research on the effect of hydrogen in steel has always been an important topic. The presence of hydrogen in high-strength steel will significantly reduce the mechanical properties of steel such as plasticity. [0003] To study the ...

Claims

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Application Information

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IPC IPC(8): G01N13/04
Inventor 刘实熊良银王永利
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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