Method and device for monitoring polarization resistance and corrosion rate of pipeline wall surface
A technology of polarization resistance and polarization current, which is used in measurement devices, weather resistance/light resistance/corrosion resistance, instruments, etc., and can solve the problem of inability to directly obtain equipment corrosion information.
Active Publication Date: 2018-03-20
HUAZHONG UNIV OF SCI & TECH
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[0004] In view of the above defects or improvement needs of the prior art, the purpose of the present invention is to provide a monitoring method and device for the polarization resistance and corrosion rate of the pipeline wall surface, wherein the overall process design and the polarization current which are key to the monitoring method The application method and size, the calculation method of the polarization resistance of the pipe wall surface, etc. are improved. Compared with the existing technology, it can effectively solve the problem that the corrosion information can only be obtained from the corrosion probe and cannot directly obtain the corrosion information of the equipment (such as the pipeline) itself. The problem
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[0062] The corrosion rate monitoring method in the present invention is especially suitable for direct online monitoring of the corrosion rate of the main body of equipment (such as pipelines, etc.). The schematic diagram of the device structure corresponding to the monitoring method is as follows figure 1 As shown, the schematic structure of probe 2 is shown in figure 2 shown.
[0063] The equipment targeted in this example is a pipe, and the material of the pipe used in the experiment is 45# carbon steel, the total length is 50 cm, and the inner diameter (D) is 6 cm. The outside of the probe 2 is insulated, and the lower end is a stainless steel rod with a height of 1cm and a diameter of Φ10, which is located at the axis of the pipe diameter. The probe is embedded with a conductivity electrode, which is used to measure the conductivity of the medium. The reference electrode 3 uses a saturated calomel electrode, which is placed at the relevant position within the range of...
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Abstract
The invention discloses a monitoring method and device of polarization resistance and corrosion speed of the surface of the pipe wall of a pipeline, wherein the monitoring method of the polarization resistance of the surface of the pipe wall of the pipeline comprises the following steps: (1) setting the pipeline to be monitored, an auxiliary electrode and a reference electrode; (2) applying polarization current to the auxiliary electrode and calculating a potential polarization value V at the position of the surface of the pipe wall, which corresponds to the reference electrode; (3) fitting a function relationship between the potential polarization value V and a distance x, wherein x refers to a distance from a projection of the reference electrode on the central axis of the pipeline to the auxiliary electrode, and calculating to obtain polarization resistance Rp of the surface of the pipe wall of the pipeline through a data fitting analysis. According to the invention, the key overall process design, the applying manner and the magnitude of the polarization current, the calculating manner of the polarization resistance of the surface of the pipe wall of the pipeline, and the like of the monitoring method are improved, so as to effectively solve the problems that corrosion information is acquired only from a corrosion probe, and corrosion information of the pipeline cannot be directly acquired.
Description
technical field [0001] The invention belongs to the field of corrosion electrochemistry, and more particularly relates to a method and a device for monitoring the surface polarization resistance and corrosion rate of a pipe wall. The monitoring method and device directly monitor the surface polarization resistance R of the pipe wall of the pipeline. p , so as to directly monitor the corrosion rate of the pipeline body online. The monitoring method and device in the present invention can be used for on-line corrosion monitoring of pipelines, and is a monitoring method that can directly obtain information from the monitored object to obtain the corrosion rate of the equipment itself. Background technique [0002] At present, online corrosion monitoring methods mainly include coupon method, resistance probe method, electrochemical linear polarization probe method, field fingerprint method, etc. The coupon method is simple and convenient in operation, reliable in data, and can ...
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IPC IPC(8): G01N17/02
CPCG01N17/02
Inventor 郭兴蓬范媛邱于兵陈振宇
Owner HUAZHONG UNIV OF SCI & TECH