Electrochemical testing device for erosion corrosion of special-shaped structure on inner wall of pipeline

Abstract

The invention belongs to the technical field of electrochemical corrosion measurement, and relates to an electrochemical testing device for erosion corrosion of a special-shaped structure on the inner wall of a pipeline. Electrochemical testing can be carried out on special-shaped structures of weld joints, reducing joints, tee joints and defects in an actual pipeline. (1) an alloy pipeline which has the same shape and size as the actual pipeline and is provided with a metal oxide coating on the inner wall is used as an auxiliary electrode, and also serves as a reaction electrolytic tank and a water pipeline; (2) when the inner wall of the whole alloy pipeline serves as the auxiliary electrode, the working area is obviously larger than the area of a working electrode; (3) a reference electrode and the working electrode are fixedly sealed in a component made of an insulating material, wherein the working surface is flush with the inner wall; (4) the reference electrode and the working electrode are fixedly sealed in the component made of the insulating material, the shape of the working surface and the relative position of the working surface and the inner wall are set according to the actual condition of the special-shaped structure; (5) the position of a three-electrode system is fixed, so that the three-electrode system can be conveniently connected with an electrochemical workstation, and the stability of the testing process is ensured; and (6) the working electrode and the reference electrode are convenient to mount and dismount.

Description

Technical field: [0001] The invention belongs to the technical field of electrochemical corrosion measurement, and in particular relates to an electrochemical test device for erosion corrosion with a special-shaped structure on the inner wall of a pipeline, which is an electrochemical test experimental device for pipeline erosion corrosion. Background technique: [0002] Due to the complex structure and various materials, there are various special-shaped structural areas in the seawater pipeline, for example: in the pipeline connected by welding, the reinforcement left when the weld material is different from the pipe material; variable diameter, tee The area is located in the inclined plane structure formed in the pipeline, and the local pits formed on the inner wall of the pipeline for some reason. The flow state or flow velocity near these special-shaped structure areas changes greatly, and local rapid corrosion is very easy to occur, resulting in rapid corrosion of the pi...

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Problems solved by technology

[0005] The above test devices and methods, the electrochemical information obtained is the average value of the inner wall of the pipe section, and it is difficult to reflect the electrochemical information of the special-shaped structure area

The existing corrosion test technology has the problem that it is difficult to obtain the electrochemical information of the regional corrosion of special-shaped structures, which cannot meet the test requirements and cannot conduct in-depth research on the corrosion behavior of special-shaped structures.

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