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Method and system for rapidly evaluating corrosion resistance of in-service coating

A technology for corrosion resistance and coating, applied in the field of corrosion resistance evaluation of in-service coatings, can solve problems such as inconvenience in rapid evaluation, and achieve the effects of rapid evaluation of corrosion resistance, convenient use and simple technical solutions

Active Publication Date: 2012-04-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, they all have relatively large limitations, and EIS tests must be performed within a certain frequency range, which brings great inconvenience to the rapid on-site evaluation.

Method used

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  • Method and system for rapidly evaluating corrosion resistance of in-service coating
  • Method and system for rapidly evaluating corrosion resistance of in-service coating
  • Method and system for rapidly evaluating corrosion resistance of in-service coating

Examples

Experimental program
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Effect test

example 1

[0037] Example 1: Inorganic zinc-rich primer / epoxy sealer / epoxy mica iron intermediate paint / acrylic polyurethane topcoat

[0038] Bottom plate material: Q235 carbon steel

[0039] Coating method: brush coating

[0040] Coating thickness: inorganic zinc-rich primer 75μm

[0041] Epoxy sealer 20μm

[0042] Epoxy mica iron intermediate paint 90μm

[0043] Acrylic polyurethane topcoat 85μm

[0044] Total coating thickness: 270μm

[0045] Sample area: 12.5cm 2

[0046] Corrosion environment: 3.5% sodium chloride solution immersion + ultraviolet radiation combined effect

[0047] by comparison image 3 Impedance value at 0.01Hz frequency (|Z| 0.01Hz ) change curve with soaking time and the change curve of phase angle with soaking time at different frequencies. 0.01Hz ) has the closest variation trend.

[0048] The coating appearance and impedance value |Z| 0.01Hz and the relationship between the phase angle at a specific frequency (10Hz) ...

example 2

[0050] Example 2: Inorganic zinc-rich primer / epoxy sealer / epoxy mica iron intermediate paint / aliphatic polyurethane topcoat

[0051] Bottom plate: Q235 carbon steel

[0052] Coating method: brush coating

[0053] Coating thickness: inorganic zinc-rich primer 70μm

[0054] Epoxy sealer 25μm

[0055] Epoxy mica iron intermediate paint 105μm

[0056] Aliphatic polyurethane topcoat 80μm

[0057] Total coating thickness: 280μm

[0058] Sample area: 12.5cm 2

[0059] Corrosion environment: 3.5% sodium chloride solution immersion + ultraviolet radiation combined effect

[0060] by comparison Figure 4 Impedance value at 0.01Hz frequency (|Z| 0.01Hz ) with immersion time and the phase angle at different frequencies with immersion time, it can be seen that the change of phase angle at 10Hz frequency is the closest to the change trend of impedance value.

[0061] The coating appearance and impedance value |Z| 0.01Hz and the relationship between t...

example 3

[0063] Example 3: 801 epoxy zinc-rich primer / 701-2 epoxy mica gray thick build primer / 652 aliphatic polyurethane topcoat

[0064] Bottom plate: Q235 carbon steel

[0065] Coating method: brush coating

[0066] Coating thickness: 801 epoxy zinc-rich primer 50μm

[0067] 701-2 Epoxy mica gray thick build primer 45μm

[0068] 652 aliphatic polyurethane 25μm

[0069] Total coating thickness: 120μm

[0070] Sample area: 12.5cm 2

[0071] Corrosion environment: 3.5% sodium chloride solution immersion + ultraviolet radiation combined effect

[0072] by comparison Figure 5 Impedance value at 0.01Hz frequency (|Z| 0.01Hz ) with immersion time and the phase angle with immersion time at different frequencies, it can be seen that the change of phase angle at 10 Hz frequency is the closest to the change trend of impedance value.

[0073] The coating appearance and impedance value |Z| 0.01Hz and the relationship between the phase angle at a specific frequency ...

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Abstract

The invention relates to an electrochemical method for rapidly evaluating the performance of an in-service coating, which can reflect a change law of impedance in the service process of the coating according to the change of a phase angle in specific frequency of a coating / metal system along with the service time and designs and develops a software system for rapidly evaluating and managing the performance of the in-service coating on the basis, which is suitable for the industrial field. The system is matched with a detection probe, a portable impedance test instrument and a notebook computer. The invention is used for rapidly evaluating the corrosion resistance and predicting the service life of the in-service coating, is particularly applied to the industrial field, has rapid and convenient measurement, reliable data and simple instrument and does not need to analyze impedance data.

Description

technical field [0001] The invention relates to a method and system for evaluating the corrosion resistance of in-service coatings, in particular to an electrochemical method and system capable of quickly evaluating the corrosion resistance of in-service coatings for structures and equipment. Background technique [0002] At present, coating protection has been widely used in many engineering structures and equipment due to its economical and practical characteristics. However, under the action of the corrosive service environment, the anti-corrosion coating on the surface will be eroded and gradually fail, which will eventually lead to corrosion damage of the metal matrix material. Therefore, grasping the coating service status of different parts of the engineering structure at any time and evaluating it quickly and effectively is conducive to timely maintenance and repair operations, and is of great significance to the safe and reliable operation of engineering structures ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00G01N17/02
Inventor 左禹唐聿明熊金平李玮庞然赵旭辉
Owner BEIJING UNIV OF CHEM TECH
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