Electrochemical experiment method for rapidly evaluating corrosion resistance of coating

An experimental method and electrochemical technology, applied in the direction of weather resistance/light resistance/corrosion resistance, scientific instruments, measuring devices, etc., can solve problems such as unfavorable on-site rapid evaluation of coating systems, and achieve good application value and research significance.

Pending Publication Date: 2021-06-01
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the biggest problem with this type of method is that only part of the impedance spectrum data is used and the electrochemical behavior of the coating c

Method used

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  • Electrochemical experiment method for rapidly evaluating corrosion resistance of coating
  • Electrochemical experiment method for rapidly evaluating corrosion resistance of coating
  • Electrochemical experiment method for rapidly evaluating corrosion resistance of coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Soak the coated steel plate 1 in artificial seawater for 24 hours respectively, coat one side of the glass steel plate, and then install the steel plate in the electrochemical device, so that the side with the peeled coating is connected to the electrode of the electrochemical device. A proper amount of artificial seawater is injected into the device with a syringe, the connection between the electrochemical device, the electrochemical workstation and the computer is connected, and the entire electrochemical device is placed in a shielding box. Start the electrochemical workstation, which is the Princeton 273A electrochemical workstation. Before the test, set the impedance test parameters as follows:

[0033] DC potential: 0mV;

[0034] AC amplitude is 10mV;

[0035] Frequency scanning range: 100k-0.01HZ;

[0036] Logarithmic sweep, 10 points per decade;

[0037] The system was subjected to constant potential polarization, and the EIS was measured after the open cir...

Embodiment 2

[0039] Soak the coated steel plate 1 in artificial seawater for 360 hours, coat one side of the glass steel plate, then install the steel plate in the electrochemical device, and connect the side with the peeled coating to the electrode of the electrochemical device. A proper amount of artificial seawater is injected into the device with a syringe, the connection between the electrochemical device, the electrochemical workstation and the computer is connected, and the entire electrochemical device is placed in a shielding box. Start the electrochemical workstation, which is the Princeton 273A electrochemical workstation. Before the test, set the impedance test parameters as follows:

[0040] DC potential: 0mV;

[0041] AC amplitude is 10mV;

[0042] Frequency scanning range: 100k-0.01HZ;

[0043] Logarithmic sweep, 10 points per decade;

[0044] The system was subjected to constant potential polarization, and the EIS was measured after the open circuit potential was stable...

Embodiment 3

[0046]Soak the coated steel plate 1 in artificial seawater for 720 hours respectively, coat one side of the glass steel plate, and then install the steel plate in the electrochemical device, so that the side with the peeled coating is connected to the electrode of the electrochemical device. A proper amount of artificial seawater is injected into the device with a syringe, the connection between the electrochemical device, the electrochemical workstation and the computer is connected, and the entire electrochemical device is placed in a shielding box. Start the electrochemical workstation, which is the Princeton 273A electrochemical workstation. Before the test, set the impedance test parameters as follows:

[0047] DC potential: 0mV;

[0048] AC amplitude is 10mV;

[0049] Frequency scanning range: 100k-0.01HZ;

[0050] Logarithmic sweep, 10 points per decade;

[0051] The system was subjected to constant potential polarization, and the EIS was measured after the open cir...

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PUM

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Abstract

The invention discloses an electrochemical experiment method for rapidly evaluating the corrosion resistance of a coating. The electrochemical experiment method comprises the following steps of: (1) soaking a steel plate with the coating in artificial seawater for 20-800 hours, and stripping the coating on one surface of the steel plate; (2) loading the treated steel plate into an electrochemical device, connecting a positive electrode and a negative electrode of the electrochemical device to an external electrochemical workstation, and setting impedance test parameters of the electrochemical workstation; (3) carrying out constant potential polarization on the system until an open circuit potential is stable, and starting to measure EIS to obtain an impedance spectrum; and (4) calculating the area under the curve of a Bode diagram, acquiring the area under curve of each soaking stage, acquiring the area change rate, and further rapidly evaluating the corrosion resistance of the coating. The electrochemical experiment method provided by the invention is simple and convenient, real-time detection is performed on site, and the corrosion resistance of the coating is rapidly evaluated.

Description

technical field [0001] The invention relates to the field of evaluation methods for coating corrosion resistance, in particular to an electrochemical experiment method for quickly evaluating coating corrosion resistance. Background technique [0002] As a large-scale offshore steel structure, offshore wind power has been exposed to harsher corrosion environments such as high temperature, high humidity, and salt spray for a long time. Corresponding anti-corrosion measures must be taken for steel components. Organic heavy-duty anti-corrosion coatings are widely used in offshore wind power protection projects because of their good economy, high construction convenience, and wide application range. Coatings have been used as an effective means of protection for decades, but there is still a lack of methods for on-site quantitative evaluation or on-site rapid detection of coating performance, coating protection status and coating damage level. [0003] The classic conventional e...

Claims

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Application Information

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IPC IPC(8): G01N17/02
CPCG01N17/02
Inventor 项燕雄邹长伟于云江田灿鑫
Owner LINGNAN NORMAL UNIV
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