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 ...

Examples

Embodiment Construction

[0035] exist figure 1 In the specific structure of the stray current corrosion test system for buried steel pipelines under the action of tensile stress shown in the present invention, after the stress loading test system is built, use a wrench to simultaneously rotate two long hexagon head bolts 3 through screw transmission. Axial tensile stress is generated, and the pulling force can be changed by adjusting the amount of rotation, and the long hexagon head bolt 3 is stopped rotating until the specified pulling force is observed on the digital multimeter 19 . In the experiment, if it is necessary to adjust the tensile stress of the sample 5, it is only necessary to rotate the long hexagon head bolt 3.

[0036] Build a soil environment simulation system, a stray current simulation system, a cathodic protection system, and an electrochemical test system. Use the soil environment simulation system to configure the required soil solution, and pour the soil solution into the elec...

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 ...

Examples

Embodiment Construction

[0035] exist figure 1 In the specific structure of the stray current corrosion test system for buried steel pipelines under the action of tensile stress shown in the present invention, after the stress loading test system is built, use a wrench to simultaneously rotate two long hexagon head bolts 3 through screw transmission. Axial tensile stress is generated, and the pulling force can be changed by adjusting the amount of rotation, and the long hexagon head bolt 3 is stopped rotating until the specified pulling force is observed on the digital multimeter 19 . In the experiment, if it is necessary to adjust the tensile stress of the sample 5, it is only necessary to rotate the long hexagon head bolt 3.

[0036] Build a soil environment simulation system, a stray current simulation system, a cathodic protection system, and an electrochemical test system. Use the soil environment simulation system to configure the required soil solution, and pour the soil solution into the elec...

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