Electrochemical testing device of welding connector in thin liquid membrane and operation method of electrochemical testing device

Abstract

The invention discloses an electrochemical testing device of a welding connector in a thin liquid membrane under a high-pressure environment and an operation method of the electrochemical testing device. The device comprises a high-pressure stretching experiment machine, a welding connector electrochemical testing module and a sample surface thin liquid membrane thickness testing and control module, wherein the electrochemical testing module comprises an electrochemical working station, the welding connector used as a working electrode, a reference electrode, an annular auxiliary electrode, an electrode wire and a control switch; the welding connector is composed of a base metal region test sample, a thermal influence region test sample and a welding line region test sample, and all regions are isolated from one another; and the sample surface thin liquid membrane thickness testing and control module comprises a universal meter, a control switch, an electrode wire, a welding region test sample, a stretching experiment machine and a platinum probe fixed on a stretching rod of the stretching experiment machine. By virtue of the electrochemical testing device, electric spark cutting is used for cutting the welding connector into different regions, and all the regions are connected or disconnected through the control switches; and the corrosion electrochemical behaviors of a single-region or multi-region coupling condition of the connector can be researched.

Description

technical field [0001] The present invention relates to an electrochemical test device and operation method for welded joints in thin liquid film under high-pressure environment, in particular to study the corrosion electrochemical test of welded joints of high-pressure transmission pipelines in thin liquid film environments such as condensate water Devices and methods. Background technique [0002] During the production and transportation of natural gas, wet natural gas without deep dehydration may precipitate condensate water in the form of a thin liquid film on the top or side wall of the pipeline due to the heat conduction between the pipeline and the external environment, causing corrosion at the top of the pipeline . When the natural gas contains acid gas, it will lead to the acidification of condensate water, aggravating the severity of top corrosion. In addition, the inhomogeneity of the structure in the welding joint of the pipeline will also increase the possibil...

AI Technical Summary

Problems solved by technology

The electrochemical test method can monitor the corrosion process and corrosion mechanism of materials in a thin liquid film environment, and then provide a theoretical basis for corrosion failure control. Relevant patents and literature reports have been found. The test system is mainly aimed at metals in atmospheric environments. Corrosion under a thin liquid film, the device used can only realize the electrochemical test of the sample under normal pressure, and the experimental object is mostly a single uniform material, and there are few research devices and implementation methods for welded joints

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