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Electrochemical test device for simulating buried pipeline steel stress corrosion under acid rain leaching condition

A technology of stress corrosion and testing equipment, which is applied in the direction of measuring equipment, weather resistance/light resistance/corrosion resistance, and the use of repeated force/pulsation force to test the strength of materials, etc., which can solve the problems of less research on biological factors, etc.

Pending Publication Date: 2021-08-27
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Domestic and foreign research on buried pipeline steel SCC mostly focuses on abiotic factors, but less on biological factors

Method used

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  • Electrochemical test device for simulating buried pipeline steel stress corrosion under acid rain leaching condition

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Embodiment Construction

[0018] Such as figure 1 As shown, the electrochemical test device for stress corrosion of buried pipeline steel under simulated acid rain leaching conditions of the present invention mainly includes: gas purification device 1, high-purity nitrogen cylinder 2, constant flow pump 3, simulated acid rain box 4, compressor 5 , Gas purification device 2 6, air inlet 7, test chamber 8, soil 9, reference electrode 10, Pt electrode 11, anaerobic box 12, filter funnel 13, filtrate receiver 14, gas outlet 15, pipeline steel electrode 16 , weighing sensor 17, WE terminal 18, CE terminal 19, RE terminal 20, worm gear reducer 21, stepper motor 22, control box 23, computer 24, nozzle 25, etc. The specific structure is as follows:

[0019] Test box 8 and filtrate receiver 14 are arranged in anaerobic box 12, and filtrate receiver 14 is positioned at the bottom of test box 8, and nozzle 25 is installed in the middle of the top of anaerobic box 12, and nozzle 25 is positioned at the top of test...

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Abstract

The invention relates to the field of soil corrosion tests, in particular to an electrochemical test device for simulating buried pipeline steel stress corrosion under the acid rain leaching condition. A test box is arranged in the anaerobic box, and a spray head is mounted in the middle of the top of the anaerobic box, is positioned above the test box and is respectively connected with a simulated acid rain box and a compressor through pipelines; a gas inlet is formed in one side of the top of the anaerobic box and connected with a high-purity nitrogen cylinder through a pipeline, and a gas outlet is formed in one side, opposite to the gas inlet, of the bottom of the anaerobic box; soil is contained in the test box, a pipeline steel electrode and a Pt electrode are horizontally and vertically buried in the soil, a reference electrode is inserted into the top of the soil, one end of the pipeline steel electrode is connected with the fixed part, the other end of the pipeline steel electrode is connected with one side of the movable part, and the other side of the movable part is connected with one end of the weighing sensor through a screw. The device is mainly used for researching the influence of the coupling effect of external stress and microorganisms on the corrosion of the buried pipeline steel under the action of simulated acid rain.

Description

technical field [0001] The invention relates to the field of soil corrosion tests, in particular to an electrochemical test device for stress corrosion corrosion of buried pipeline steel under simulated acid rain leaching conditions. Background technique [0002] Since 1965, pipeline cracking accidents have occurred in the United States, Canada, China, Russia, Iran and other countries. Stress corrosion cracking (SCC) is considered the most destructive form of corrosion due to its rapid and unpredictable occurrence. At home and abroad, most of the research on SCC of buried pipeline steel focuses on abiotic factors, but less on biological factors. Studies have shown that microbial corrosion is the most common type of buried steel corrosion, among which SRB corrosion is the most serious. When there is SRB, the corrosion rate of steel is less than 10 microns / year, when there is SRB, the corrosion rate reaches 200 microns / year, and the local corrosion rate is as high as 700 mic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/02G01N3/16G01N3/38
CPCG01N3/16G01N3/38G01N17/006G01N17/02G01N2203/0003G01N2203/0005G01N2203/0019G01N2203/005
Inventor 许进韦博鑫白云龙付琦覃清钰龙康孙成王振尧
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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