Electrochemistry test method used for rotary type single-phase flow erosion testing

Abstract

The invention discloses an electrochemical test method applied to a rotary single-phase flow erosion test. Make the working electrode of the test piece and install it on the test device, adjust the distance between the working, reference and auxiliary electrodes; add the corrosive solution to be tested from the feeding port on the top of the container and be 75mm higher than the auxiliary electrode; The electrochemical method of adding passivation potential to the working electrode pre-corrodes the working electrode until the current becomes smaller and tends to be stable, so that a uniform and dense corrosion product protective film is formed on the surface of the working electrode; turn on the frequency conversion motor, and use the computer to follow the preset acceleration curve Slowly increase the speed, and observe the current curve of the potentiostat until a sudden change occurs. It is suitable for the experimental research of the critical characteristics or transient characteristics of the erosion damage of the protective film under the coupled action of corrosion and flow. It can simulate the actual working conditions in the industrial environment, and the electrochemical test for real-time detection of the transient characteristics and critical values ​​of material erosion damage method.

Description

technical field [0001] The invention relates to an electrochemical testing method for erosion tests, in particular to an electrochemical testing method applied to rotary single-phase flow erosion tests. Background technique [0002] Fluid pipeline is a special equipment for transporting fluid under certain pressure. It has become one of the five major transportation modes alongside road, railway, water transportation and aviation. Transport of fluid materials. Fluid pipelines are widely used in the national economy, but the erosion failure of the pipeline system by corrosive multiphase flow is obviously localized and sudden, and the safety risk is great. [0003] Corrosion of pipelines will not only cause oil and gas leakage loss due to perforation and waste of materials and manpower due to maintenance, but may also cause fire due to corrosion perforation. Especially for high-pressure gas pipelines, once they rupture, the compressed gas expands rapidly, releasing a large a...

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Problems solved by technology

[0006] (1) At present, the mechanism of erosion test in my country is not deep enough, and the relevant equipment test takes a long time, and the experimental results are difficult to promote engineering applications

[0007] (2) The test method is single; the erosion test of scholars at home and abroad usually puts the metal specimen into the corrosive medium, by increasing the flow rate or rotating speed, and statically testing the loss of metal by weighing, it is impossible to realize the fluid erosion damage. Study on Transient Characteristics of Critical Value

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