Buried metal pipeline erosion resistant coating disbonding test system under action of direct current stray current

Abstract

The invention discloses a buried metal pipeline erosion resistant coating disbonding test system under the action of direct current stray current, comprising a direct current stray current system which is used for providing direct current stray current required by sample erosion resistant coating cathodic disbonding; an electrochemical test system which is used for testing the dynamic parameters of sample erosion resistant coating disbonding in the direct current cathodic polarization process and performing data processing and analysis; a soil simulated solution system which is used for simulating the actual working conditions of a buried metal pipeline in different soil environments; a sample clamping system which is used for clamping a sample of the buried metal pipeline needed by test;and an electrolytic tank system which is used for containing the soil simulated solution and fixing the sample clamping system. The system disclosed by the invention is simple in structure, convenientin dismounting, good in experiment test result, capable of effectively simulating pipeline erosion resistant coating cathodic disbonding caused by inflow of the stray current to the damaged points ofthe erosion resistant coating of the buried metal pipeline, and applicable to the experimental study of cathodic disbonding of the erosion resistant coatings of various buried pipelines.

Description

technical field [0001] The invention relates to the technical field of peeling failure test of anticorrosion layer of buried metal pipeline, in particular to a peeling test system of anticorrosion layer of buried metal pipeline under the action of direct current stray current. Background technique [0002] In the project, the use of the organic anti-corrosion layer provides 99% protection for the pipeline, which significantly improves the service life of the buried metal pipeline. A good anti-corrosion layer can protect the metal substrate from corrosion for 20 years. However, due to the complexity of the coating process and mechanical collisions during the construction process, the anti-corrosion layer on the pipeline will inevitably have some defects such as pinholes and damage. Or due to the long-term action of various corrosion factors in the soil during the long-term service process, bond failure occurs and defects such as damage and peeling of the anti-corrosion layer ...

AI Technical Summary

Problems solved by technology

Since the occurrence of underlayer corrosion of buried pipelines is relatively hidden and difficult to observe, the external anticorrosion layer is often intact, and the metal under the anticorrosion layer has already undergone large-scale corrosion, which seriously threatens the safe operation of the pipeline.

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