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Double-electrolyte digital sensor for detecting diffusion and permeation rate of atomic hydrogen in metal

A permeation rate and electrolyte technology, which is applied in the field of metal hydrogen damage monitoring devices, can solve the problems of easy leakage of liquid electrolyte and complicated sensor installation, and achieve the advantages of long-distance transmission, avoiding external power supply, and improving explosion-proof requirements Effect

Inactive Publication Date: 2011-02-02
长沙新中大环境科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the installation of the sensor is complicated, and it is easy to miss when using liquid electrolyte

Method used

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  • Double-electrolyte digital sensor for detecting diffusion and permeation rate of atomic hydrogen in metal
  • Double-electrolyte digital sensor for detecting diffusion and permeation rate of atomic hydrogen in metal
  • Double-electrolyte digital sensor for detecting diffusion and permeation rate of atomic hydrogen in metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Hydrogen permeation detection needs to go through three steps: workpiece surface treatment, sensor installation and hydrogen permeation detection.

[0042] (1) Electroplating of the catalytic metal layer on the surface of the workpiece. Surface pretreatment is required before electroplating. The treatment process is as follows: polish with fine sandpaper, wash with water, then use tweezers to pick up absorbent cotton dipped in acetone to wipe, remove surface oil, clean with secondary water, and then use 40% HCl Pickling for 30s. Use nickel plating solution to form NiSO 4 ·7H 2 O 215g·dm -3 , NaCl 11g·dm -3 、H 3 BO 3 33g·dm -3 , anhydrous Na 2 SO 4 25g·dm -3 , MgSO 4 35g·dm -3 , pH 5 ~ 5.5, use 1.5V dry battery to provide electroplating power at room temperature, at 2cm 2 The area is nickel-plated, and the adjustable rheostat is used to control 15mA·cm -2 A certain electroplating current density, plating for 5 minutes, can obtain a catalytic nickel layer ...

Embodiment 2

[0048] The surface pretreatment of the sample, the installation of the sensor and the hydrogen filling conditions of the sample are the same as in Example 1.

[0049] See Figure 5 shown.

[0050] Depend on Figure 5 It can be seen that the nickel plating time has a great influence on the hydrogen permeation current, and the steady state hydrogen permeation current for 1 minute of nickel plating is 31 μA cm -2 , the steady-state hydrogen permeation current of nickel plating for 5 minutes reaches 40μA·cm -2 , the steady-state hydrogen permeation current increases sequentially between nickel plating 1min and 5min, and the steady-state hydrogen permeation current does not change much after the nickel plating time is greater than 5min; but the response time of the sensor increases with the increase of the electroplating time, and the nickel plating time is 1min When the response time of the sensor is 200s, the response time of the sensor is 600s when the nickel plating is 10min...

Embodiment 3

[0052] The purpose of this embodiment is to compare the measurement and permeation curves of the double electrolyte sensor and the single electrolyte sensor. In order to verify the correctness of the detection results of the double electrolyte sensor.

[0053] The surface pretreatment of the sample, the installation of the sensor and the hydrogen filling conditions of the sample are the same as in Example 1.

[0054] The hydrogen permeation curves detected by the two sensors are shown in Image 6shown. The experimental results show that the response of the hydrogen permeation curve of the sensor using the dual electrolyte sensor lags slightly in the initial stage, but the value of the steady-state current density is basically the same as the time required to reach the steady-state current density, which shows that the dual-electrolyte sensor is the same as the single-electrolyte sensor. The detection junction of the Devanathan hydrogen sensor device of the electrolyte is con...

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Abstract

The invention discloses a double-electrolyte digital sensor for detecting the diffusion and permeation rate of atomic hydrogen in a metal. The double-electrolyte digital sensor adopts a three-electrode system; an auxiliary electrode adopts a thin palladium sheet of which the thickness is 0.1 mm; a reference electrode adopts a pure nickel wire; the electrolyte adopts a twin-fluid system with colloidal high polymer potassium hydroxide solution and liquid potassium hydroxide solution; a constant potential circuit is used for controlling constant oxidation potential to ensure that the atomic hydrogen permeated to a nickel-plated hydrogen collecting surface is oxidized; a high-energy battery is used for driving the sensor to work; output current signals are digitalized; a magnet fixed mount is adopted to fix the sensor on a nickel-plated or palladium-plated workpiece surface; and the measured steady-state hydrogen permeation current is used for representing the hydrogen permeation rate which serves as basic data for hydrogen-induced cracking risk assessment and judgment. The double-electrolyte digital sensor has the following advantages that: the design of the sensor is elaborate; the colloidal electrolyte is used for contacting the workpiece surface without liquid leakage; the flexibility of the sensor is high; the response speed is high; the test result is accurate; digital signals are output; and conveying interferences can be eliminated.

Description

technical field [0001] The invention relates to a monitoring device for metal hydrogen damage, in particular to a dual-electrolyte digital sensor for detecting the diffusion and penetration rate of atomic hydrogen in metal. Background technique [0002] Since the beginning of the last century, especially in the past 30 years, the petrochemical industry has developed rapidly. A large number of pressure vessels and piping systems used in the petrochemical industry are in a high-temperature and high-pressure hydrogen environment. These pressure vessels and piping systems are mainly used for catalytic reforming. Hydrogen refining, hydrocracking and desulfurization. In the operation of these devices and pipelines, due to the infiltration of hydrogen, especially in the case of sulfur, atomic hydrogen may enter the metal lattice to cause hydrogen damage and crack the metal. The final result will lead to the destruction of equipment and cause major damage. Economic losses and indus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N13/04
Inventor 余刚张清敏
Owner 长沙新中大环境科技有限公司
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