CN-122016629-A - Anticorrosive coating gas-phase hydrogen permeation monitoring device and method

Abstract

The invention discloses a device and a method for monitoring gas-phase hydrogen permeation of an anti-corrosion coating, wherein the device comprises an electrolyte module, a high-voltage module and a potentiometer, the electrolyte module comprises a first barrel and a first flange, a boss is arranged on one side of the first flange, which is away from the first barrel, and a detection hole is formed in the boss; the high-pressure module comprises a second cylinder, a second flange plate and a pressure gauge, wherein the second cylinder is connected with an external hydrogen gas source pipeline, one end of the second cylinder is connected with the second flange plate, the second flange plate is provided with a placing groove, the placing groove is suitable for placing a sample, and the boss is in plug-in fit with the placing groove and is in butt joint with the sample. Through setting up boss and standing groove, the potentiometer is convenient for acquire stable potential signal to accurate hydrogen permeation current density of calculating unit area guarantees the accuracy nature and the comparability of data.

Inventors

• YU QIAOYAN
• LIU GUOHAO
• MU CHENGGUANG
• PAN TENG
• Cong chang
• ZHU ZIYANG
• LI DONGYANG
• JI HUI
• ZHAO JUN
• Zuo Chenduo
• ZHAO RUIQI
• YAO JIARUI
• ZHANG ZHONGTAO
• Shi Duoer

Assignees

• 国家石油天然气管网集团有限公司
• 国家石油天然气管网集团有限公司科学技术研究总院分公司

Dates

Publication Date

20260512

Application Date

20260226

Claims (10)

1. 1. A vapor phase hydrogen permeation monitoring device for an anti-corrosion coating, comprising: The electrolyte module (1) comprises a first cylinder body (11) and a first flange plate (12), wherein one end of the first cylinder body (11) is connected with the first flange plate (12), a boss (121) is arranged on one side, away from the first cylinder body (11), of the first flange plate (12), a detection hole (1211) is formed in the boss (121), and the detection hole (1211) penetrates through the first flange plate (12) along the axial direction of the first cylinder body (11); The high-pressure module (2) comprises a second cylinder (21), a second flange plate (22) and a pressure gauge (23), wherein the second cylinder (21) is connected with an external hydrogen gas source pipeline, one end of the second cylinder (21) is connected with the second flange plate (22), the second flange plate (22) is provided with a placing groove (221) and a clamping groove (222) communicated with the placing groove (221), the placing groove (221) is suitable for placing a sample, the first flange plate (12) is detachably connected with the second flange plate (22), the boss (121) is in plug-in fit with the placing groove (221) and is in butt joint with the sample, and the detection end of the pressure gauge (23) is inserted into the second cylinder (21); The potentiometer (3) is connected with an auxiliary electrode (31), a reference electrode (32) and a working electrode (33), the auxiliary electrode (31) and the reference electrode (32) are respectively inserted into the first cylinder (11), the detection end of the reference electrode (32) is opposite to the detection hole (1211), and the working electrode (33) is limited in the clamping groove (222) and is connected with the sample.
2. 2. The corrosion-resistant coating gas-phase hydrogen permeation monitoring device according to claim 1, wherein a pressure relief valve (213) is further installed on the side wall of the second cylinder (21), and the pressure relief valve (213) is electrically connected with the pressure gauge (23).
3. 3. The corrosion-resistant coating gas-phase hydrogen permeation monitoring device according to claim 2, wherein a pressure relief hole is formed in one end of the first cylinder (11) facing away from the second cylinder (21), an assembly part (13) is detachably connected to the first cylinder (11), and an explosion-proof membrane is arranged on the assembly part (13) and covers the pressure relief hole.
4. 4. A corrosion protection coating gas phase hydrogen permeation monitoring device according to any one of claims 1-3, wherein the electrolyte module (1) further comprises a hole plug (14), a water filling port is arranged at the top end of the first cylinder (11), the hole plug (14) is installed at the water filling port, the hole plug (14) is provided with two installation ports (141), and the auxiliary electrode (31) and the reference electrode (32) are installed at the hole plug (14) respectively and penetrate through the two installation ports (141).
5. 5. A corrosion protection coating vapor phase hydrogen permeation monitoring device according to any of claims 1-3, characterized in that said first cylinder (11) is a transparent piece.
6. 6. A corrosion protection coating gas phase hydrogen permeation monitoring device according to any of claims 1-3, characterized in that a first connection part (122) is arranged on one side of the first flange (12) facing away from the second cylinder (21), and the first connection part (122) is in threaded connection with the first cylinder (11).
7. 7. A corrosion-resistant coating gas-phase hydrogen permeation monitoring device according to any one of claims 1-3, characterized in that a drain pipe (112) is arranged at the bottom end of the first cylinder (11), and a drain valve (113) is arranged on the drain pipe (112).
8. 8. The corrosion-resistant coating gas-phase hydrogen permeation monitoring device according to claim 1, further comprising a machine table (4), wherein the first flange plate (12) is slidably connected with the machine table (4) along the axial direction of the first cylinder body (11), and the second flange plate (22) is opposite to the first flange plate (12) and fixedly connected with the machine table (4).
9. 9. The corrosion protection coating vapor phase hydrogen permeation monitoring device according to claim 1 or 8, wherein the second cylinder (21) and the second flange plate (22) are an integral piece.
10. 10. A method of monitoring vapor phase hydrogen permeation of a corrosion-resistant coating, performed by the corrosion-resistant coating vapor phase hydrogen permeation monitoring device according to any one of claims 1 to 9, comprising: Placing a sample to be tested in the placing groove (221), moving the first cylinder (11) to enable the boss (121) to be in contact with the sample, and connecting the first flange (12) and the second flange (22); Injecting alkaline electrolyte into the first cylinder (11), and standing for a period of time until the potential detected by the potentiometer (3) tends to be stable; injecting hydrogen into the second cylinder (21) until reaching a preset pressure; And obtaining steady-state current density corresponding to preset pressure in preset time, and calculating to obtain gas-phase hydrogen permeation quantity according to the steady-state current density.

Description

Anticorrosive coating gas-phase hydrogen permeation monitoring device and method Technical Field The invention relates to the technical field of material corrosion and protection, in particular to a device and a method for monitoring gas-phase hydrogen permeation of an anti-corrosion coating. Background Hydrogen energy is a novel efficient renewable resource. In the process of hydrogen energy development and utilization, no matter the existing natural gas pipe network is utilized for hydrogen loading and conveying or a new hydrogen conveying pipeline is utilized for pure hydrogen conveying, the problem of material hydrogen environmental compatibility is required to be considered. If the corrosion-resistant coating in the pipeline cannot effectively block hydrogen permeation, hydrogen atoms can penetrate through the inner coating and gather at the defect of the base material, so that hydrogen embrittlement (sudden drop of toughness and burst fracture of the material), hydrogen bubbling (swelling and cracking of the surface of the base material) or hydrogen-induced stress corrosion cracking are caused, and equipment failure and safety accidents are caused. Therefore, the hydrogen permeation monitoring test on the anti-corrosion coating is beneficial to finding out defects of the coating in time, and the service life of the coating is estimated, so that reliable guarantee is provided for the safe operation of equipment. Meanwhile, through analysis of hydrogen permeation data, an important basis can be provided for improvement and optimization of coating materials, and continuous development of anti-corrosion coating technology is promoted. The current common coating permeability evaluation method is mainly an electrochemical method, and the principle is that the electrochemical change of the coating in the corrosion failure process of the substrate is utilized, and the hydrogen permeability of the coating is evaluated according to an electrochemical change signal detected by an electrochemical detection instrument. However, electrochemical monitoring of the hydrogen concentration of the hydrogen-charging side provided by the electrolytic hydrogen permeation method is limited, the sensitivity to the test environment is high, the change of external factors can generate significant interference on the detection signal, so that deviation of monitoring data occurs, and accurate quantitative assessment of the hydrogen permeation amount is difficult to realize. Disclosure of Invention The invention aims to provide a gas-phase hydrogen permeation monitoring device for an anti-corrosion coating, which has a simple structure and accurate detection. The technical scheme is that the anti-corrosion coating gas-phase hydrogen permeation monitoring device comprises an electrolyte module, a high-pressure module and a potentiometer, wherein the electrolyte module comprises a first cylinder body and a first flange, one end of the first cylinder body is connected with the first flange, a boss is arranged on one side of the first flange, which is away from the first cylinder body, the boss is provided with a detection hole, the detection hole penetrates through the first flange along the axial direction of the first cylinder body, the high-pressure module comprises a second cylinder body, a second flange and a pressure gauge, the second cylinder body is connected with an external hydrogen gas source pipeline, one end of the second cylinder body is connected with the second flange, the second flange is provided with a placing groove and a clamping groove communicated with the placing groove, the placing groove is suitable for placing a sample, the first flange is detachably connected with the second flange, the boss is in plug-in fit with the placing groove and is in butt joint with the sample, the detection end of the pressure gauge is inserted into the second cylinder body, the auxiliary clamping electrode and the auxiliary reference electrode are connected with the working electrode and the working electrode are opposite to the detection hole, and the working electrode is connected with the working electrode and the working position opposite to the detection electrode. Preferably, a pressure relief valve is further installed on the side wall of the second cylinder, and the pressure relief valve is electrically connected with the pressure gauge. Preferably, a pressure release hole is formed in one end, facing away from the second cylinder, of the first cylinder, an assembly part is detachably connected to the first cylinder, an explosion-proof membrane is arranged on the assembly part, and the pressure release hole is covered by the explosion-proof membrane. Preferably, the electrolyte module further comprises a hole plug, a water filling port is arranged at the top end of the first cylinder body, the hole plug is installed at the water filling port, the hole plug is provided with two installation ports, and the auxiliary electr