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A Method for Accelerating Failure and Corrosion of Organic Coating/Metal Systems

An organic coating and metal technology, applied in weather resistance/light resistance/corrosion resistance, instruments, measuring devices, etc., can solve problems that cannot fully meet the corrosion failure of organic coating/metal systems, and achieve simple and operable methods Strong, accelerated failure and corrosion effects

Active Publication Date: 2022-05-17
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, none of the above methods can fully comply with the corrosion failure mechanism of the organic coating / metal system. Therefore, it is particularly important to seek an electrochemical acceleration method that is more consistent with the natural corrosion process of the organic coating / metal system.

Method used

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  • A Method for Accelerating Failure and Corrosion of Organic Coating/Metal Systems
  • A Method for Accelerating Failure and Corrosion of Organic Coating/Metal Systems

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Embodiment Construction

[0041] Below in conjunction with accompanying drawing, a kind of test procedure and test result of the method for accelerating organic coating / metal system failure and corrosion of the present invention are described in detail as follows:

[0042] Taking the epoxy electrophoretic paint coating / carbon steel sample as the test object, taking 3.5% sodium chloride solution as the test medium, carry out the immersion test respectively, adopt the equal electric cathode and anode alternation method of the present invention to carry out the accelerated test, adopt the prior art The accelerated test was carried out by the equipotential cathodic and anode alternation method. specifically:

[0043] In a pair of proportions, the electrochemical AC impedance was measured every 240 hours in the immersion test. Use the electrochemical workstation to carry out the electrochemical impedance spectroscopy test on the sample. The test uses a three-electrode electrolytic cell, wherein the referen...

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Abstract

The invention provides a method for accelerating the failure and corrosion of an organic coating / metal system, which can accelerate the failure and corrosion process of the organic coating / metal system without changing the failure and corrosion mechanism of the organic coating / metal system in the natural environment, thereby rapidly Evaluate the corrosion resistance of organic coating / metal systems. The method adopts the following continuous steps: (1) perform electrochemical impedance test on the organic coating / metal system sample; (2) apply a certain negative charge to the sample, and then apply the negative charge to the sample after the negative charge is completely consumed. Positive electricity equal to the value of negative electricity; (3) After the positive electricity is consumed, the sample is tested for open circuit potential for a certain period of time; the above steps 1) to 3) are taken as a test cycle, and the sample is tested according to this test cycle The test is repeated continuously until the sample has detectable damage, or until the impedance value of the sample is less than a certain value.

Description

technical field [0001] The invention belongs to the technical field of material corrosion and protection, and specifically relates to a technology for accelerating failure and corrosion of an organic coating / metal system, and rapidly evaluates its corrosion resistance. Background technique [0002] As one of the most important methods of metal corrosion protection, organic coatings are widely used on various metal materials and equipment. With the increasingly higher requirements for the protective performance of organic coatings and the increasing demand for rapid evaluation of the corrosion resistance of organic coatings / metal systems, traditional salt spray, ultraviolet, and cyclic corrosion tests accelerate the failure of organic coatings and evaluate organic coatings. The efficiency of corrosion resistance of coating / metal systems is often not high, and the failure and corrosion process of organic coating / metal systems cannot be quantitatively characterized. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/02
CPCG01N17/02
Inventor 宋光铃许雨晴郑大江
Owner XIAMEN UNIV
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