Anticorrosion layer peeling testing device based on electrochemical impedance spectrum

Abstract

The invention belongs to the field of a testing device of a pipeline anticorrosion technology and discloses an anticorrosion layer peeling testing device based on an electrochemical impedance spectrum. The anticorrosion layer peeling testing device comprises an electrolytic tank group, a constant potential rectifier, a data collection and analysis system, an electrochemical work station and a voltage measuring instrument. A simulated soil solution is contained in the electrolytic tank group and is used for simulating an actual condition of peeling an anticorrosion layer of a buried steel pipeline. The data collection and analysis system is connected with the electrochemical work station to measure the electrochemical impedance spectrum in real time and carry out data processing and analysis; the performance of the anticorrosion layer is quantitatively evaluated to monitor the peeling condition of a defect hole part of the anticorrosion layer in real time. The device disclosed by the invention can effectively simulate the actual condition of peeling the anticorrosion layer of the buried steel pipeline and can monitor the cathode peeling process in real time; a test result has very good repeatability and reproducibility; the anticorrosion layer peeling testing device is simple and convenient to operate and is suitable for the cathode peeling tests and the test evaluation of the anticorrosion layers of various buried steel pipelines.

Description

technical field [0001] The invention belongs to the field of testing devices for pipeline anticorrosion technology, and relates to an anticorrosion layer peeling test device based on electrochemical impedance spectroscopy, which can monitor the process of anticorrosion layer peeling in real time, and is especially suitable for cathodes of various buried steel pipeline anticorrosion layers Peel test and test evaluation. Background technique [0002] Usually, the anticorrosion layer of buried steel pipelines is not perfect in isolating the corrosive medium. Due to the defects of the anticorrosion layer itself (hole counting, leakage points, etc.) and the mechanical damage to the anticorrosion layer during pipeline transportation, loading and unloading, and construction, the pipeline After burial, the surrounding soil environment (such as soil stress, cathode hydrogen evolution and other factors), third-party damage, etc. will also lead to the formation and expansion of defects...

AI Technical Summary

Problems solved by technology

[0002] Usually, the anticorrosion layer of buried steel pipelines is not perfect in isolating the corrosive medium. Due to the defects of the anticorrosion layer itself (hole counting, leakage points, etc.) and the mechanical damage to the anticorrosion layer during pipeline transportation, loading and unloading, and construction, the pipeline After burial, the surrounding soil environment (such as soil stress, cathode hydrogen evolution and other factors), third-party damage, etc. will also lead to the formation and expansion of anti-corrosion layer defects, which will cause the anti-corrosion layer to lose its cohesive force and cause peeling failure

[0003] The traditional peeling test device is built by the test piece and the plastic tank. The space between the test piece and the bottom of the plastic tank is sealed with silica gel or clamps. However, the silicone has strong fluidity and is easy to flow to the surface of the test piece inside the plastic tank, which affects the test area.

When the fixture is used to seal, the surface of the anti-corrosion layer of the test piece is not uniform, resulting in leakage and affecting the test results

In addition, the traditional peeling test device is to observe and measure the peeling distance of the defect hole from a macro perspective, the measurement error is large, it is impossible to monitor the peeling of the anti-corrosion layer at the defect hole in real time, and the operation is inconvenient

Images