Method for stray current corrosion test of buried steel pipeline under tensile stress action

Abstract

The invention relates to a method for the stray current corrosion test of a buried steel pipeline under the tensile stress action, and belongs to the material corrosion and protection fields. A system used by the method comprises a stress loading test system, a soil environment simulation system, a stray current simulation system, a cathode protection system and an electrochemical test system. The stress loading test system generates a pressure required by a sample test, the soil environment simulation system stimulates the soil environment in which a buried metal is positioned to prepare soil solutions having different pH values and conductivities, the stray current simulation system generates direct current, alternate current and direct and alternate mixed stray currents, the cathode protection system provides a cathode protection potential for the sample, and the electrochemical test system tests the corrosion potentials of the sample under different influence factors. The system used by the method can measure the weight loss, can obtain the corrosion morphology, can generate the direct current, alternate current and direct and alternate mixed stray currents, can provide the stress required by the test according to the practical running condition, can stimulate the cathode protection, and can realize the corrosion rule experiments under different influence factors.

Description

technical field [0001] The invention belongs to the field of material corrosion and protection, and in particular relates to a test method for stray current corrosion of buried steel pipelines under the action of tensile stress. Background technique [0002] As my country's buried pipeline network becomes more and more complex, steel pipelines in the pipeline network will cause more and more corrosion problems under the action of factors such as stray current and stress, and the damage will become more and more serious. Therefore, research on buried steel pipelines The law of stray current corrosion is very urgent under stress conditions. Since the stray current is affected by many factors such as soil conductivity and buried depth, and it is difficult to conduct field experiments in the special environment, it is very necessary to establish a stray current corrosion test system for buried steel pipelines under stress conditions. At present, there is a single tensile stress ...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the defects of the existing tensile stress test device and tensile stress corrosion test device, such as small tensile stress, low test accuracy, and inability to carry out stray current corrosion experiments, the present invention utilizes screw transmission to generate tensile stress, digital multimeter 19 The value obtained by the high-precision tension sensor 9 is displayed in real time, and the DC power supply 22, the pulse signal generator 21, and the intelligent interrupter 20 are used to generate DC, AC, and AC-DC mixed current stray currents; the constant voltage source 12 is used to generate cathodic protection potential; The workstation 15 performs electrochemical tests on the stressed sample; utilizes the pH meter 14 and the conductivity meter 13 to configure soil solutions with different pH and conductivity and monitors changes in soil solution parameters during the experiment

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