Interference corrosion test device for pipeline by direct-current stray currents
A stray current and corrosion test technology, used in measuring devices, weather resistance/light resistance/corrosion resistance, instruments, etc., can solve the problem of inability to obtain comprehensive data on the influence of stray current, and achieve rich experimental data and effective experimental data. Effect
Pending Publication Date: 2020-07-10
CHINA PETROLEUM & CHEM CORP +2
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Problems solved by technology
[0006] The experimental methods obtained in the prior art cannot obtain comprehensive data on the influence of stray currents on the peeling coating of pipelines
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[0026] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.
[0027] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.
[0028] In this document, for the convenience of description, spatially relative terms, such as "below", "below", "lower", "above", "above", "upper", etc., may be used to describe the relationship between one element or feature and another. The relationship of elements or features in the drawings. It will be understood that the spatially relative terms are intended to encompass different orientations of the item in use or o...
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The invention discloses an interference corrosion test device for a pipeline by direct-current stray currents. The interference corrosion test device comprises an environment simulation unit and a circuit unit. Pipeline steel and an insulating layer are arranged in a shell of the environment simulation unit. A spacing gap is formed between the pipeline steel and the insulating layer; the insulating layer is provided with a through hole for communicating a solution area with the spacing gap; the environment simulation unit further comprises a stress applying part and a stress collecting part. The circuit unit comprises an interference simulation sub-circuit and a measurement sub-circuit. The interference simulation sub-circuit comprises a direct-current power supply and an auxiliary electrode; the auxiliary electrode is used for acquiring experimental data; the measurement sub-circuit comprises a reference electrode, a voltmeter and a plurality of microelectrodes which are connected inseries; and the voltmeter is used for respectively acquiring potential data between the plurality of microelectrodes and the reference electrode. According to the invention, real-time monitoring can be carried out on local environments and pipe body corrosion electrochemical behaviors at different positions under the direct-current interference pipeline steel stripping coating.
Description
technical field [0001] The invention relates to the field of petrochemical industry, in particular to a test device for interference and corrosion of pipelines caused by DC stray current. Background technique [0002] With the large-scale construction of high-voltage / ultra-high-voltage transmission lines and electrified railway systems, the interference of buried pipelines by stray currents and the resulting pipeline corrosion and safety issues have become increasingly prominent. [0003] The anti-corrosion layer of the buried pipeline has good insulation. The stray current entering the pipeline from the soil will flow out from the defects such as damage and peeling of the anti-corrosion layer of the pipeline after a certain distance of transmission. Corrosion occurs locally at the location. Corrosion caused by stray current belongs to electrochemical corrosion, and the corrosion caused by it will cause significant loss of production materials (such as oil and gas pipelines...
Claims
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IPC IPC(8): G01N17/02
CPCG01N17/02G01N17/006
Inventor 李世瀚王晓霖李明赵巍王佳楠李遵照
Owner CHINA PETROLEUM & CHEM CORP