Experiment system for corrosion of stray currents in subway

Abstract

An experiment system for corrosion of stray currents in a subway belongs to a system for simulating corrosion process of stray currents in a subway. An anode and a cathode of an adjustable direct-current power supply of the experiment system are connected with two different auxiliary electrodes respectively, and the auxiliary electrodes are embedded in the upper surface of a reinforced concrete block. Reinforcing steel bars are distributed at different positions inside the reinforced concrete block. The lower surface of the reinforced concrete block closely contacts with soil medium in a soil box, and steel tubes are disposed in the soil box. Reference electrodes are buried close to the reinforcing steel bars and the steel tubes. Measuring points of the reinforcing steel bars, measuring points of the steel tubes and the reference electrodes are connected with a signal conditioner through wires, and a testing signal is transmitted to a data acquisition device. A pressure signal of the adjustable direct-current power supply is transmitted to the data acquisition device through an electricity transmitter in real time. The data acquisition device transmits the two signals to an upper computer through a serial communication port. The experiment system can effectively simulate the corrosion process of stray currents in a subway, and accordingly capability of estimating corrosion state of a metal structure in a subway system is further increased for experiment preparation.

Description

technical field [0001] The invention relates to a system for simulating the corrosion process of subway stray current, in particular to a subway stray current corrosion experiment system. Background technique [0002] Most subway locomotives use DC traction power supply mode. The current required by the locomotive is provided by the traction substation, which sends power to the locomotive through the catenary (overhead line or contact rail), and returns to the traction substation through the rail as the traction current loop. , because the rails are difficult to be completely insulated from the ground, so the traction current does not flow back to the traction substation from the rails, but a part of the rails strays into the ground, forming underground stray currents. Studies have shown that stray currents will cause serious electrochemical corrosion to metal structures such as steel bars in the concrete main structure and buried metal pipelines in the subway system, which ...

AI Technical Summary

Problems solved by technology

[0004]Technical problem: the purpose of this invention is to provide a subway stray current corrosion experimental system, which solves the current inability to quantitatively express the relationship between polarization potential and various influencing factors The problem

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