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Sensor for measuring corrosion of outer wall of metal tube

A technology for outer wall corrosion and metal pipes, which is applied in the field of metal corrosion measurement devices, can solve the problems of quantitative evaluation and indirect evaluation of the corrosion state of metal pipelines, and achieve the effects of simple and accurate evaluation methods, rapid detection and evaluation, and sensitive response

Inactive Publication Date: 2016-08-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic evaluation methods for the corrosion resistance of metal pipelines are limited to monitoring the deformation of the pipeline and the use status of the outer coating, or using non-destructive testing methods to detect the damage location and damage degree of the pipeline whose outer wall has been damaged. Indirect evaluation of the overall corrosion status of metal pipelines can be made by using parameters such as changes in pipeline surface morphology, and it is impossible to quantitatively evaluate the corrosion status of metal pipelines under service conditions
Based on the principle of electrochemical measurement, the online rapid detection and evaluation of the corrosion state of the outer wall of the metal pipeline and the electrochemical measurement sensor and evaluation method applicable to the outer wall of various specifications of metal pipelines have not been used in China.

Method used

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  • Sensor for measuring corrosion of outer wall of metal tube
  • Sensor for measuring corrosion of outer wall of metal tube
  • Sensor for measuring corrosion of outer wall of metal tube

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Using AutoLab 302N electrochemical workstation and the developed sensor to carry out electrochemical impedance test, the test sample is X65 pipeline steel, the outer wall of the sample is evenly coated with epoxy resin coating, and the test solution is 3.5wt% sodium chloride aqueous solution (simulated Seawater), the sponge is filled with the test solution and stuffed into the bottom of the sensor, the test temperature is 25°C, the test period is 50 days, the results are as follows Figure 8 shown.

[0067] Soaking time until the 10th day, the measured impedance complex plane is still in the shape of a single semicircle, and it can be inferred from the radius of the capacitive reactance arc that the measured inner wall surface has a higher coating resistance (50MΩ*cm2), It shows good corrosion resistance. In order to further confirm the accuracy of the experimental data, the sample was placed under a KEYENCE VHX-2000 full depth microscope for magnification and observat...

Embodiment 2

[0070] Using AutoLab 302N electrochemical workstation and the developed sensor to carry out electrochemical impedance test, the test sample is X65 pipeline steel, the outer wall of the sample is evenly coated with epoxy resin coating, and the test solution is 3.5wt% sodium chloride aqueous solution (simulated Seawater), the sponge is filled with the test solution and stuffed into the bottom of the sensor, the test temperature is 25°C, the test time is the 140th day and the 200th day of immersion, the results are as follows Figure 11 shown.

[0071] On the 200th day of immersion, the measured impedance complex plane began to show the characteristics of three time constants of double capacitive reactance arc + diffusion impedance, and the radius of the capacitive reactance arc decreased significantly (30KΩ*cm2) compared with the initial soaking period, indicating that the solution had penetrated. When the overcoat reaches the surface of the metal substrate and corrodes, the cor...

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Abstract

The invention discloses a sensor for measuring corrosion of the outer wall of a metal tube. The sensor comprises a disc-shaped cover plate, a reference electrode column, an auxiliary electrode and a circular base. A cover-plate center hole is formed in the center of the disc-shaped cover plate, a thread is arranged on the outer side of a small disc of the disc-shaped cover plate, the reference electrode column comprises an upper portion composed of a reference electrode wiring column, a connecting column and a chlorination silver wire and a lower portion composed of a fastening solenoid and a glass tube, the glass tube of the lower portion is sleeved with the connecting column of the upper portion, the chlorination silver wire in the connecting column extends into the bottom end of the glass tube, a platinum sheet of the auxiliary electrode is arranged below the small disc of the disc-shaped cover plate, and an annular magnet is arranged inside the circular base to attract the whole device to the surface of experiment metal. The testing device is sensitive in response, convenient to carry and rapid and convenient to operate, and the broken condition, the broken type and the corrosion degree of the coating of the outer wall of a metal pipe can be rapidly judged in the service state.

Description

technical field [0001] The invention relates to a metal corrosion measuring device, in particular to a sensor for measuring the corrosion of the outer wall of a metal pipe. Background technique [0002] According to a survey, the annual economic loss caused by corrosion in the world reaches 600 billion to 1.2 trillion yuan, accounting for 2%-4% of the gross national product of each country. Especially for water conservancy or oil and gas pipelines, the safety of pipelines during their operation is of great significance. There are many factors that affect the service life of metal pipelines, such as pipeline working pressure, processing materials, third-party damage, metal corrosion, coating cracks and other factors will shorten the service life of pipelines. Among them, corrosion factors have the most serious influence on the service life of pipelines. [0003] The environments that cause metal corrosion vary greatly, and even the same material has different corrosion form...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N17/02
CPCG01N17/006G01N17/02
Inventor 王吉会李秋实
Owner TIANJIN UNIV
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