Sensor for measuring corrosion of inner wall of metal tank body and monitoring method

A technology for inner wall corrosion and metal cans, which is applied in the field of corrosion measurement of the inner wall of metal packaging solid tanks, can solve the problems of quantitative evaluation and inability to realize the corrosion resistance of metal cans, and achieve the effects of rapid data collection, simple test methods, and portability

Active Publication Date: 2012-06-13
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 tanks are limited to monitoring the deformation and surface morphology of the tank body, or indirectly evaluating the corrosion status of the metal tank body according to the changes in the contents, which cannot achieve the corrosion resistance of metal tanks. Quantitative evaluation in service state

Method used

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  • Sensor for measuring corrosion of inner wall of metal tank body and monitoring method
  • Sensor for measuring corrosion of inner wall of metal tank body and monitoring method
  • Sensor for measuring corrosion of inner wall of metal tank body and monitoring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Using the VersaStat 4 electrochemical workstation and the developed sensor, the electrochemical impedance spectroscopy test was carried out on the metal beverage cans (containing functional beverages) with a storage period of 3 months and an organic phenolic coating on the inner wall. The results are shown in the attached image 3 shown. The measured impedance complex plane is in the shape of a semicircle, and it can be deduced from the value of the radius of the semicircle that the measured inner wall surface has a relatively high coating resistance (80MΩ*cm 2 ), indicating that it has good corrosion resistance. In order to further confirm the accuracy of the experimental data, the metal can was cut open to observe its inner wall coating, and it was found that the surface of the coating was complete and smooth without any damage.

Embodiment 2

[0053] Using the VersaStat 4 electrochemical workstation and the developed sensor, the electrochemical impedance spectroscopy test was carried out on the metal beverage cans (containing functional drinks) with a storage period of 15 months and an organic phenolic coating on the inner wall. The results are shown in the attached Figure 4 shown. The measured impedance complex plane is characterized by double capacitive reactance arcs, but the radius of the capacitive reactance arc is significantly reduced (1-10MΩ*cm 2 ). It shows that part of the built-in solution has penetrated into the metal substrate through the organic coating, and the corrosion protection performance of the organic coating is gradually failing. In order to further confirm the accuracy of the experimental data, the metal can was cut open to observe its inner wall coating, and it was found that there was a small area of ​​damage on the surface of the coating, and the metal substrate in a local area had been ...

Embodiment 3

[0055] Using the VersaStat 4 electrochemical workstation and the developed sensor, the electrochemical impedance spectroscopy test was carried out on the metal beverage cans (containing functional beverages) with a storage period of 30 months and an organic phenolic coating on the inner wall. The results are shown in the attached Figure 5 shown. The measured impedance complex plane shows the characteristics of obvious double capacitive reactance arc, and the radius of the capacitive reactance arc is significantly reduced compared with Example 1 and Example 2 (0.1 ~ 0.5MΩ*cm 2 ). It shows that the internal solution has penetrated the organic coating to reach the surface of the metal substrate and corroded, and the corrosion resistance protection performance of the organic coating has failed. In order to further confirm the accuracy of the experimental data, the metal tank was cut open to observe its inner wall coating, and it was found that there were large areas of black cor...

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Abstract

The invention discloses a sensor for measuring the corrosion of the inner wall of a metal tank body and a monitoring method. The sensor is of the following structure that the sensor comprises a fixing device, a sleeve, a reference electrode, an auxiliary electrode and a working electrode; and in the measuring process, the sensor is arranged at the top of a metal tank, the metal tank and the sensor are fixed and are tightly contacted through magnets, the electrodes partly extend into the tank to be in contact with a solution for performing an electrochemical detection, and a contact of the working electrode is attracted by the magnets to be fixed on the outer surface of the tank body. In the monitoring process, the corrosion behavior and degree of the inner wall of the metal tank are tested by utilizing an electrochemical low-frequency impedance spectroscopy technology. In the technical scheme disclosed by the invention, the sensor has simple manufacturing process, is sensitive to response, is convenient to carry and is simple to operate; the monitoring method is simple and convenient and has high data resolvability; the breakage condition, the breakage type and the corrosion degree of a coating on the inner wall of the metal tank can be rapidly judged in the service environment by the monitoring method; and the monitoring method is suitable for carrying out rapid detection andevaluation on the corrosion degree of the coatings on the inner walls of the metal tanks with various sizes.

Description

technical field [0001] The invention relates to the field of corrosion detection, in particular to a corrosion measurement of the inner wall of a metal packaging solid tank based on the principle of electrochemical measurement. Background technique [0002] Due to its excellent barrier properties and mechanical properties, tin-plated steel sheets are widely used in the field of food packaging, such as three-piece beverage cans, food cans and biscuits, tea dry product cans, etc. For metal packaging products, the main disadvantage is that it is prone to corrosion, which can cause deterioration of the contents and may cause food safety problems. The anti-corrosion ability of food cans directly affects the quality and shelf life of the contents, but the variety of contents and storage requirements are different, which poses new problems for food can manufacturers. With the development of society and people's requirements for green environmental protection, higher requirements a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/02
Inventor 韩哲文夏大海王吉会
Owner TIANJIN UNIV
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