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A metal stress corrosion test device in a crevice

A technology of corrosion experiment and metal stress, applied in the field of corrosion experiment technology and measurement, it can solve the problems that stress corrosion cannot be studied and cannot be applied, and achieve the effect of simple structure, convenient operation and small volume.

Inactive Publication Date: 2016-10-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
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Problems solved by technology

[0003] The purpose of the present invention is to provide a metal stress corrosion experiment device in a crevice, which solves the problems that the existing crevice corrosion research technology cannot apply force, and the stress corrosion in the local environment of the crevice cannot be studied. The device and its experimental method can be used for buried Stress Corrosion Simulation Research of Ground Pipeline Under Stripping Coating

Method used

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  • A metal stress corrosion test device in a crevice
  • A metal stress corrosion test device in a crevice
  • A metal stress corrosion test device in a crevice

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] Such as figure 1 , as shown in Figure 2(a) and Figure 2(b), the experimental device for metal stress corrosion corrosion in the crevice of the present invention mainly includes: a booster support base 1, a positioning gasket 2, a crevice pool base 3, a crevice pool 4, and a crevice pool support 5. Load measuring sensor 6, loading nut 7, tensile sample 8, force support plate 9, gap pool cover 10, microelectrode 11, bulk solution pool 12, load display 13, gap opening 14, microelectrode jack 15. Fixing hole 16, fixing piece 17, O-ring 18, etc. The specific structure is as follows:

[0020] Such as figure 1 As shown, on the booster support base 1, the booster support plate 9 is arranged in parallel, and the tensile sample 8 is installed between the parallel booster support plates 9, and the tensile sample 8 passing through the gap pool 4 stretche...

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Abstract

The invention relates to the fields of corrosion test technology and measurement, in particular to a device for carrying out a metal stress corrosion test in a gap. The device is characterized in that a stress-applying supporting base is parallelly provided with stress-applying supporting plates, a tensile sample is arranged between the stress-applying supporting plates which are parallelly arranged, the tensile sample penetrating through a gap pool stretches out of one end of each stress-applying supporting plate, loaded nuts are arranged at the outer sides of the stress-applying supporting plates, the tensile sample is in threaded connection with the loaded nuts, and a bolt-thread loading structure is formed in a way that the tensile sample, the loaded nuts and the stress-applying supporting plates are matched. According to the device disclosed by the invenition, different gap depth electrochemical measurement can be carried out on a metal in the gap, and real-time monitoring can be carried out on micro-environmental change in the gap; and device disclosed by the invention has the advantages that the size is small, the structure is simple, the operation is convenient, the detection accuracy is high, and the like.

Description

technical field [0001] The invention relates to the field of corrosion experiment technology and measurement, in particular to a metal stress corrosion experiment device in a crevice. Background technique [0002] Generally, the anticorrosion coating of buried pipelines is not perfect in isolating corrosive media. Due to the defects of the coating material itself (pinholes, leaks, etc.) and the pipeline transportation, loading and unloading and construction process, the coating will be mechanically damaged, and the surrounding soil environment after the pipeline is buried (such as: soil stress, cathodic hydrogen evolution, etc.) Factors), third-party damage, etc. will lead to the formation and expansion of coating defects. The above results will cause the anti-corrosion coating to lose its cohesive force and peel off, forming a gap between the pipeline surface and the coating. ) penetrates into the crevice, a local corrosion microenvironment will be formed, which will lead...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08G01N17/00
Inventor 闫茂成孙成许进吴堂清龙康
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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