Simulation device and method of electrochemical corrosion of steel buried pipeline caused by stray current
A stray current, buried pipeline technology, applied in measuring devices, scientific instruments, weather resistance/light resistance/corrosion resistance, etc.
Inactive Publication Date: 2014-05-07
SHENZHEN UNIV
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The Chinese invention application with publication number CN 102338735 A discloses a test method for pipeline corrosion caused by stray current interference, and the Chinese invention application with publication number CN102312240 A discloses a test method for steel corrosion caused by stray current generated by multiple interference sources. In the test method, constant direct current is used in both invention applications to simulate stray current, but in fact stray current is a low-frequency bipolar current, a characteristic between direct current and alternating current, using alternating current or None of the DC power supplies can truly reflect the characteristics of steel corrosion caused by stray currents
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[0021] The structure of the electrochemical corrosion simulation test device for steel buried pipelines caused by stray current in the embodiment of the present invention is as follows figure 1 Shown. It consists of a bipolar DC power supply 1, a signal generator 2, a potentiostat 3, a steel pipe 4, a saturated copper sulfate reference electrode 6, a titanium alloy mesh 7, a data recorder 8, a soil 9 and a plastic test tank 10. All electrical appliances are connected with BNC cables.
[0022] The steel pipe 4, the saturated copper sulfate reference electrode 6 and the auxiliary anode (titanium alloy mesh) 7 are respectively buried in the soil 9 of the plastic test tank 10.
[0023] The saturated copper sulfate reference electrode is used on the buried steel pipeline, and the time history data of the stray current measured by voltammetry is input into the signal generator 2, and the signal generator 2 is used to generate the stray current analog signal.
[0024] The stray current an...
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The invention discloses a simulation device and method of the electrochemical corrosion of a steel buried pipeline caused by stray current. The simulation device comprises a power supply, a potentiostat, a reference electrode, an auxiliary anode, a steel pipe and a container filled with soil, wherein the reference electrode, the auxiliary anode and the steel pipe are buried in soil; the power supply comprises a signal generator and a dual-polarity direct-current power supply; a stray current simulation signal generated by the signal generator is transmitted to the dual-polarity direct-current power supply; a voltage signal output end of the dual-polarity direct-current power supply is connected with a signal input end of the potentiostat; a reference electrode interface of the potentiostat is connected with the reference electrode; a working electrode interface is connected with the steel pipe; an auxiliary anode interface is connected with the auxiliary anode. According to the simulation device and method disclosed by the invention, the electrochemical corrosion generated by the steel buried pipeline caused by the stray current can be simulated under laboratory conditions; stray current is generated by utilizing the tested time-history data of stray current via the stray current generated by the dual-polarity direct-current power supply, and the corrosion process of steel buried pipelines in soil along the railway is represented truly and precisely.
Description
[Technical Field] [0001] The invention relates to anti-corrosion technology for steel pipelines along electrified railways such as subways and high-speed railways, and in particular to a simulation device and method for electrochemical corrosion of steel buried pipelines caused by stray currents. [Background technique] [0002] At present, the engineering community and research institutions are unclear about the influence of stray current generated by electric railways on the electrochemical corrosion of steel pipelines in the soil along the line. Journal "Applied Mechanics and Materials" Vol. 226-228, Page 2147-2153 Published a paper by author DONG Zhi Jun and others: "Distribution of the stray current of rebar in the ballast bed", which discussed the characteristics of the stray current of the rebar in the ballast bed, and the characteristics of the stray current on the buried pipeline and the rebar in the ballast bed. The stray current characteristics are basically the same. ...
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Inventor 邢锋董志君陈湘生李筱毅唐路平韩宁旭王卫仑刘树亚陈丽王建明刘伟
Owner SHENZHEN UNIV