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Coating failure monitoring probe and rapid field coating failure monitoring method

A failure monitoring and coating technology, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of inconvenient on-site inspection of vehicle or aircraft coatings, and achieve the effects of simple structure, high response sensitivity and long life

Inactive Publication Date: 2018-11-16
WUHAN CORRTEST INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires a coated electrode immersed in the electrolyte, a stable reference electrode, and in particular a set of specialized analytical tools.
Therefore, on-site inspection of vehicle or aircraft coatings is inconvenient

Method used

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  • Coating failure monitoring probe and rapid field coating failure monitoring method
  • Coating failure monitoring probe and rapid field coating failure monitoring method
  • Coating failure monitoring probe and rapid field coating failure monitoring method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] figure 1 It is a specific structure of a coating failure monitoring probe used in combination with the principle of electrochemical AC impedance, combined with figure 1 with figure 2 , the coating failure monitoring probe comprises a probe cavity 4, a probe inner core positioned in the probe cavity, a base plate positioned at the bottom of the probe cavity and an outer guide wire 5, the upper end of the cavity 4 is open, and the base plate is preferably a stainless steel base plate. The outer guide wire 5 is connected to the inner core of the probe and extends out of the probe cavity 4 .

[0064] Cavity 4 is made of ABS resin shell, and this shell is cylindrical tubular structure, and its longitudinal middle position is the inner core of probe. The inner core of the probe adopts a three-electrode system defined in electrochemistry, including a working electrode 1, a reference electrode 2 and an auxiliary electrode 3. The three electrodes are all made of 7075 aluminum...

Embodiment 2

[0068] The four wires of the monitoring probe in this embodiment are connected on the AC impedance tester to form a fast monitoring sensor for the failure of the acoustic coating. The sensor uses AC impedance technology to monitor the failure degree of the coating on site. The specific method is:

[0069] (1) Obtain the initial impedance modulus and initial phase angle: monitor the initial moment, apply the same new coating as the metal coating to be tested on the working surface of the coating failure monitoring probe, and apply a fixed frequency to the AC impedance tester The 10-30mV sine wave signal forms a current loop on the surface of the probe, and is calculated by IV conversion circuit and phase correlation method to obtain the initial impedance modulus and initial phase angle at the initial moment at a certain frequency;

[0070] (2) Obtain the measured impedance modulus and measured phase angle at a certain measurement moment: at a certain measurement moment, the AC ...

Embodiment 3

[0074] Three different portable coating probes (A-PU, F-PU, PU) were used for the accelerated salt spray test. The neutral salt spray test was carried out according to the ISO7253 standard to accelerate coating aging, and all samples were exposed to 5% NaCl (pH=7) and carried out in a salt spray chamber at a temperature of 35±2°C. The salt spray test was set to 60 minutes of spraying, intermittent spraying and 60 minutes of drying interval to simulate the drying and wetting process in the alternate spraying marine environment. At the same time, the electrochemical impedance of the coating under different aging times was tested in real time. Impedance test parameters: AC amplitude 20mV, scanning frequency range 100kHz ~ 0.01Hz, logarithmic scanning, 10 points / 10 times frequency.

[0075] The test results show that when the salt spray of three different portable coating probes (A-PU, F-PU, PU) is accelerated, the diameter length of the capacitive reactance arc decreases and the...

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Abstract

The invention relates to a coating failure monitoring probe and a rapid field coating failure monitoring method. The coating failure monitoring probe comprises a probe cavity, a probe inner core, a base plate and an outer guide line, wherein the probe inner core is located in the probe cavity, and the base plate is located at the bottom of the lower end of the probe cavity; the upper end of the probe cavity is provided with an opening; the probe inner core is composed of a working electrode, a reference electrode and an auxiliary electrode; the working electrode, the reference electrode and the auxiliary electrode are arranged on the base plate and are arranged at intervals; an insulating sealing layer is arranged between every two adjacent electrodes; and the top ends of the three electrodes form a working surface at the opening in the upper end of the cavity. The monitoring probe has the advantages of being simple in structure, high in response sensitivity, long in service life and high in reliability. The rapid field coating failure monitoring sensor has the advantages that an electrochemical impedance principle is adopted, the coating failure monitoring probe is combined with an alternating-current impedance tester, the detecting parameters are various, the response sensitivity is high, and therefore the aging state and the aging speed of coating in the service can be monitored in real time.

Description

technical field [0001] The invention relates to the technical field of corrosion monitoring and protection, in particular to a coating failure monitoring probe and an on-site coating failure rapid monitoring method. Background technique [0002] In order to better prevent and reduce the impact of corrosion, many projects and projects adopt coating protection technology. The coating will be affected by factors such as moisture absorption, climate change, external force damage, construction defects, etc. These anti-corrosion coatings will age and fail over time, resulting in a decline in anti-corrosion performance and eventually failure of the overall structure. In serious cases, it will cause damage to equipment, etc., and even cause serious accidents, causing economic property and even casualties, and bringing losses or inconvenience to production and life. Therefore, it is very necessary to take scientific and effective protective measures. [0003] The method about coati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/02
CPCG01N17/02
Inventor 董泽华罗颖
Owner WUHAN CORRTEST INSTR
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