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A Method for Measuring Hydrogen Diffusion Coefficient of Solid Steel at High Temperature

A diffusion coefficient and solid technology, applied in measuring devices, diffusion analysis, instruments, etc., can solve the problems of inability to directly measure hydrogen diffusion coefficient at high temperature, difficulty in measuring hydrogen diffusion coefficient, poor measurement reproducibility, etc., to achieve convenient testing, testing The effect of wide temperature range and fewer test steps

Active Publication Date: 2021-11-30
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrochemical hydrogen charging and dehydrogenation experiments are carried out at the same time, the test is convenient, and accurate measurement results can be obtained by controlling reasonable test parameters. However, due to the limitation of the electrolyte, this method is suitable for measuring data at room temperature, and cannot directly measure hydrogen at high temperature. Diffusion coefficient in steel
[0006] Among the above two methods, the measurement reproducibility of the placement release method is poor, the measurement steps are complicated, and the test is inconvenient; the electrochemical method cannot directly measure the diffusion coefficient of hydrogen in steel at high temperature
Leading to a difficult measurement of hydrogen diffusion coefficient in solid steel at high temperature

Method used

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  • A Method for Measuring Hydrogen Diffusion Coefficient of Solid Steel at High Temperature
  • A Method for Measuring Hydrogen Diffusion Coefficient of Solid Steel at High Temperature
  • A Method for Measuring Hydrogen Diffusion Coefficient of Solid Steel at High Temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] The device for measuring the hydrogen diffusion coefficient of solid steel at high temperature includes an electrolytic cell test device, a DC power supply and an electrochemical workstation; its structure is as follows figure 1 and figure 2 shown;

[0066] The electrolytic cell testing device comprises a first support pipe 1, a second support pipe 2, a first air inlet pipe 3, a first air outlet pipe 4, a second air inlet pipe 5, a second air outlet pipe 6, a first porous electrode 7, a second air outlet pipe Porous electrode 8 and reference electrode 9;

[0067] One end of the first support tube 1 and the second support tube 2 is bonded and fixed together by a high-temperature adhesive 14, and the other ends of the first support tube 1 and the second support tube 2 are respectively sealed with a first sealing rubber plug 10 and a second support tube. The sealing rubber plug 11 is closed;

[0068] The part between the first sealing rubber plug 10 and the second seal...

Embodiment 2

[0086] The structure of the device for measuring the hydrogen diffusion coefficient of solid steel at high temperature is the same as in Example 1;

[0087] The thickness of the solid steel 13 to be tested is 3cm, and the material grade is 304 austenitic steel;

[0088] Method is with embodiment 1, and difference is:

[0089] (1) The inert gas is helium;

[0090] (2) The target temperature is 1000±0.5°C;

[0091] (3) Hydrogen-inert gas mixed gas is hydrogen-helium mixed gas; the volume percentage of hydrogen in hydrogen-inert gas mixed gas is 0.1%;

[0092] (4) The hydrogen source gas is a hydrogen-water vapor mixed gas, and the volume percentage of hydrogen in the hydrogen source gas is 10%;

[0093] (5) When the voltage applied by the electrochemical workstation is 4.0V, the time to reach the steady state current t ∞ is 554.1s, calculate t s is 349.1s, does not decrease with the increase of the steady-state voltage; calculate D=3 2 / (6×349.1)=42.96×10 -4 cm 2 / s;

...

Embodiment 3

[0096] The structure of the device for measuring the hydrogen diffusion coefficient of solid steel at high temperature is the same as in Example 1;

[0097] The thickness of the solid steel 13 to be tested is 0.1 cm, and the material grade is U71 ferritic steel;

[0098] Method is with embodiment 1, and difference is:

[0099] (1) The inert gas is nitrogen;

[0100] (2) The target temperature is 300±0.5°C;

[0101] (3) Hydrogen-inert gas mixed gas is hydrogen-nitrogen mixed gas; the volume percentage of hydrogen in hydrogen-inert gas mixed gas is 5%;

[0102] (4) The hydrogen source gas is a hydrogen-inert gas mixed gas, and the inert gas is nitrogen; the volume percentage of hydrogen in the hydrogen source gas is 10%;

[0103] (5) When the voltage applied by the electrochemical workstation is 3.5V, the time to reach the steady state current t ∞ is 26.5s, calculate t s 16.7s, does not decrease with the increase of the steady-state voltage; calculated D = 0.1 2 / (6×16.7)=...

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Abstract

A device and method for measuring the hydrogen diffusion coefficient of solid steel at high temperature, the device includes an electrolytic cell test device, a DC power supply and an electrochemical workstation; the electrolytic cell test device includes a first support tube, a second support tube, a first air intake tube, a second One air outlet pipe, the second air inlet pipe, the second air outlet pipe, the first porous electrode, the second porous electrode and the reference electrode; the method is: (1) feed inert gas into the first support pipe and the second support pipe (2) the electrolytic cell testing device is heated up to the target temperature; (3) inert gas is passed into the first support tube, or hydrogen-inert gas mixed gas is passed into; (4) hydrogen source gas is passed into the second support tube; (5) Apply a voltage to the porous electrode and the solid steel to be tested, electrolyze the second proton conductor solid electrolyte, measure the current density-time curve; and calculate the diffusion coefficient of hydrogen in the solid steel to be tested. The device and method of the invention have fewer testing steps, are convenient for testing, and have accurate test results.

Description

technical field [0001] The invention relates to a technology for measuring the hydrogen diffusion coefficient, in particular to a device and method for measuring the hydrogen diffusion coefficient of solid steel at high temperature. Background technique [0002] In smelting engineering, the moisture and oil in the atmosphere, auxiliary materials, and refractory materials react with molten iron or molten steel to produce hydrogen, which enters the melt to produce dissolved hydrogen. The saturated solubility of hydrogen in steel decreases with the decrease of temperature, and the saturated solubility drops sharply during the liquid-solid transition, and the hydrogen that has not diffused out during the solidification of molten steel will precipitate, resulting in hydrogen-induced defects. Therefore, testing the diffusion coefficient in solid steel can be used to formulate a scientific and reasonable production process, diffuse out hydrogen in steel, reduce hydrogen content, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00
CPCG01N13/00G01N2013/003
Inventor 厉英丁玉石
Owner NORTHEASTERN UNIV LIAONING