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Method for rapidly evaluating critical corrosion damage of multilayer coating system

A multi-layer coating and evaluation method technology, applied in the direction of measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problem of poor light aging resistance, loss of matrix metal protection, and inability to accurately evaluate the critical corrosion damage of the coating system Value and other issues

Inactive Publication Date: 2014-10-01
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, when using the EIS method to study the protective performance of the coating system, the coating system is usually soaked in the electrolyte for a long time to study the failure mechanism of the coating, which is very different from the actual service environment of the coating. The results of the laboratory immersion test are used It is impossible to accurately evaluate the critical corrosion damage value of the coating system in the actual service environment
Especially for the multi-layer coating system with good weather resistance, the primer layer has good corrosion resistance, but the light aging resistance is poor, and the multi-layer coating system still has good protective performance after being soaked in the laboratory for 100 days, but In the actual service environment, once the topcoat layer of the multi-layer coating system is damaged, the primer layer will be pulverized quickly by the action of solar radiation and lose its protective effect on the base metal. In this case, the laboratory immersion test will Obtained evaluation results contrary to the actual service environment

Method used

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  • Method for rapidly evaluating critical corrosion damage of multilayer coating system
  • Method for rapidly evaluating critical corrosion damage of multilayer coating system
  • Method for rapidly evaluating critical corrosion damage of multilayer coating system

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0016] Step 1: Visually inspect the macroscopic morphology characteristics of the multilayer coating system to be evaluated, preliminarily judge the aging failure degree of the multilayer coating system, and test the remaining thickness of the multilayer coating system with a thickness gauge.

[0017] Step 2: Select the aging failure or serious damage (such as severe pulverization, blistering, cracking, peeling) of the multi-layer coating system as the electrochemical test site, fix the test container, and soak the test site in 3.5% NaCl solution After 20 minutes, the surface of the multi-layer coating system is fully wetted. If the multi-layer coating system has reached the critical corrosion damage state, the corrosion solution will soon soak into the metal substrate. Otherwise, the corrosion solution will be blocked during the invasion process and cannot etch the metal substrate. , to achieve the purpose of in-situ non-destructive testing.

[0018] Step 3: Use the three-ele...

example 1

[0025] Example 1: Sulfuric acid anodization + 2 layers of TB06-9 coating

[0026] Base metal: 2D12 aluminum alloy

[0027] Coating method: spraying

[0028] Coating thickness: the first layer of TB06-9 coating 15μm ~30μm

[0029] The second layer of TB06-9 coating 15μm ~30μm

[0030] Total coating thickness: 30μm ~60μm

[0031] The measured thickness of the original coating: 43μm ~52μm

[0032] Test environment: marine atmospheric environment

[0033] Test method: platform outdoor air exposure

[0034] Test time: 2 years

[0035] In this example, the multi-layer coating system is composed of sulfuric acid anodized layer and 2 layers of TB06-9 coating. figure 2 The electrochemical data obtained from the analysis and test of the CM equivalent circuit model shown, the capacitance and impedance values ​​of each coating or conversion layer are shown in Table 1, and the first coating impedance values ​​(R 1 ) down to 10 6 Ω / cm 2. Evaluation results: The multi-l...

example 2

[0038] Example 2: Sulfuric acid anodization + TB06-9 + TS96-71 coating

[0039] Coating substrate: 2D12 aluminum alloy

[0040] Coating method: spraying

[0041] Coating thickness: TB06-9 coating 15μm ~30μm

[0042] TS96-71 coating 40μm ~70μm

[0043] Total coating thickness: 55μm~100μm

[0044] The measured thickness of the original coating: 80μm~90μm

[0045] Test environment: marine atmospheric environment

[0046] Test method: platform outdoor air exposure

[0047] Test time: 2 years

[0048] In this example, the multi-layer coating system is composed of sulfuric acid anodized layer, TB06-9 coating and TS96-71 coating. figure 2 The electrochemical data obtained by analyzing the CM equivalent circuit model shown in the test, the capacitance and impedance values ​​of each coating or conversion layer are shown in Table 2, and the second layer of coating at the second and third test sites in the three test sites Impedance value (R 2 ) has a large drop, les...

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Abstract

As for a multilayer coating system in use or a multilayer coating system sample for carrying out a natural environment test, the invention provides a method for rapidly evaluating a coating critical corrosion damage value on the basis of macroscopic appearance features and electrochemical features according to the characteristic that the corrosion damage degree of a first coating of the multilayer coating system directly affects the protecting performance of the coating system. According to the method, the macroscopic appearance features of the multilayer coating system are detected visually, the electrochemical impedance spectroscopy of a portion which has an aging failure or is seriously damaged is measured, a multilayer coating system physical model and an electrochemical impedance spectroscopy CM equivalent circuit model are established according to the preparation mode of the multilayer coating system and the characteristic that the thickness is large, the capacitance and the resistance of each coating of the multilayer coating system are obtained by carrying out analysis through an electrochemical feature analysis system, and the critical corrosion damage value of the multilayer coating system is rapidly evaluated according to the impedance value of the first coating. The method is simple, data are reliable, and an evaluating result is accurate and practical.

Description

technical field [0001] The invention relates to a rapid evaluation method for critical corrosion damage of a multilayer coating system, in particular to a method for rapidly evaluating the critical corrosion damage of a multilayer coating system based on macroscopic morphology characteristics and electrochemical characteristics. Background technique [0002] At present, coatings to protect metal materials against corrosion have been widely used in various industries, especially for industries and products with high anti-corrosion requirements, multi-layer coating systems have been applied to improve the shielding effect of the coating system, to control substrate corrosion and improve product use. purpose of life. However, the multi-layer coating system will be exposed to natural climate conditions for a long time, and will be aged and failed by the combined effects of environmental factors such as solar radiation, temperature, humidity, and corrosive media, and eventually l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/416
Inventor 舒畅苏艳
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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