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Method for accelerating color printing iron corrosion by using electrochemical cathodic polarization

A cathodic polarization, electrochemical technology, applied in the direction of weather resistance/light resistance/corrosion resistance, scientific instruments, measuring devices, etc., can solve the problems of distinguishing and judging scale difference, misjudgment, low resolution, etc., to improve the processing technology , Optimized processing technology, high resolution effect

Active Publication Date: 2015-04-29
ORG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The essence of this corrosion resistance test method is the electrochemical anodic polarization acceleration method, and the corrosion morphology of the sample is observed with the naked eye. This evaluation standard not only has a very low resolution, but also due to the difference in the resolution and judgment scale of the observer, There is clearly a risk of misjudgment in the conclusions drawn

Method used

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  • Method for accelerating color printing iron corrosion by using electrochemical cathodic polarization
  • Method for accelerating color printing iron corrosion by using electrochemical cathodic polarization
  • Method for accelerating color printing iron corrosion by using electrochemical cathodic polarization

Examples

Experimental program
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Effect test

Embodiment 1

[0033] 1. Preparation of the instrument

[0034] Regarding the electrodes and electrolytic cells used in the present invention, the applicant’s prior application CN201210172244.9, titled “An electrolytic cell for testing the corrosion resistance of packaging materials”, has a detailed description, and this case refers to its Incorporated as part of this application.

[0035] according to figure 1 Install the electrolytic cell and electrodes. The color-printed iron working electrode is placed at the bottom of the tube-packed electrolytic cell, the working surface is placed on the top, the rubber ring is sealed, the upper cover is installed, the 4 positioning bolts are tightened, the reference electrode and the auxiliary electrode are installed in a suitable position, and the intake hose is installed. And the exhaust hose, open the nitrogen valve, adjust the flow rate to 2 bubbles / second, and keep nitrogen deoxygenation. The lower end of the reference electrode is installed i...

Embodiment 2

[0049] In addition to replacing -4.414V with the output voltage of the adjustable regulated power supply -6.414V, replacing 0h, 1.5h, 1.5h, Except for 3.5h, 5.5h, 7.5h, 9.5h, and 26.5h, the rest follow the same method as in Example 1.

[0050] Figure 4 It is the Bode diagram of the working electrode under the output voltage of the adjustable regulated power supply -6.414V. Depend on Figure 4 It can be seen that after 22.5 hours of cathodic polarization, the coating of the Red Bull beverage can has basically failed.

Embodiment 3

[0052] In addition to replacing -4.414V with the output voltage of the adjustable regulated power supply -7.414V, replacing 0h, 1.5h, 3.5h, 5.5 with electrochemical cathode polarization 0h, 1.5h, 3.5h, 5h, 9.5h, 22.5h Except h, 7.5h, 9.5h, and 26.5h, all the other follow the same method as in Example 1.

[0053] Figure 5(a)-Figure 5(b) It is the Bode diagram and the corrosion topography diagram of the working electrode under the output voltage of the adjustable regulated power supply -7.414V. Depend on Figure 5(a)-Figure 5(b) It can be seen that after 5 hours of cathodic polarization, the coating of the Red Bull beverage can has basically failed, and the corrosion spots are clearly visible.

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Abstract

The invention provides a method for accelerating color printing iron corrosion by using electrochemical cathodic polarization. The method comprises the following steps of: (1) manufacturing the color printing iron into a working electrode, installing the working electrode into an electrolytic tank, wherein a reference electrode and an auxiliary electrode are installed in the electrolytic tank in advance, and assembling into an electrolytic tank system; (2) maintaining the electrolytic tank system in an anaerobic environment; (3) connecting the electrolytic tank, an electrochemical working station, an adjustable voltage-stabilized power supply and a double-pole-double-throw switch; and (4) adjusting the output voltage of the adjustable voltage-stabilized power supply so as to carry out cathodic polarization on the working electrode, measuring the electrochemical impedance spectrum of the working electrode by using the electrochemical working station, obtaining the coating resistance of the working electrode, and confirming that the coating corrosion final point is reached when the coating resistance is less than or equal to 106omegacm<2>. By utilizing the method, relatively high resolution is achieved, the degree of degradation and failure of the coating is quantitatively analyzed according to the change of the impedance response, and good foundation is established for further improving and optimizing a color printing iron machining process.

Description

technical field [0001] The invention relates to a method for accelerating the corrosion of electrochemical color printing iron, in particular to a method for accelerating the corrosion of color printing iron by using electrochemical cathodic polarization. Background technique [0002] The shelf life of beverage or food in tinplate three-piece cans is generally 1-3 years. Because the liquid in metal beverage cans is usually corrosive, it is easy for metal beverage cans to undergo electrochemical reactions with the liquid in the can, resulting in metal beverage cans. corrosion. When the corrosion condition of the coating of metal beverage cans (for example, beverage cans made of color-printed iron) exceeds a certain level, the product will deteriorate due to coating failure during the shelf life. Therefore, monitoring and improving the corrosion resistance of the coating applied to color printing iron is one of the important factors to ensure product quality. However, exclud...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/02
Inventor 赵宇晖曾科宋莉华李众
Owner ORG TECH CO LTD
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