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A kind of anti-corrosion composite coating and preparation method thereof

A composite coating and metal corrosion technology, applied in the field of metal anti-corrosion, can solve problems such as unevenness and unstable coating, achieve no side effects, improve anti-corrosion effect, and improve coating stability

Active Publication Date: 2018-10-30
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the anti-corrosion effect of EPS direct dip coating method is affected by many factors, and its coating has the disadvantages of instability and unevenness.

Method used

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  • A kind of anti-corrosion composite coating and preparation method thereof
  • A kind of anti-corrosion composite coating and preparation method thereof
  • A kind of anti-corrosion composite coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] At room temperature around 25°C, add 0.4685-1.874g of hydrophilic SiO to 100mL ethanol solutions with volume concentrations of 30%, 50%, 80%, and 100%, respectively. 2 Nanoparticle powder, and use an ultrasonic pulverizer to process 5-10min at 20±5°C to prepare 0.5wt%, 1wt%, 1.5wt%, 2wt% SiO 2 Nano solution, each solution is adjusted to pH 8-9 with 1mol / L NaOH solution.

[0047] Prepared SiO 2 Nanoparticle solution testing zeta potential, SiO in solution 2 The average particle size of colloidal particles, the results are shown in Figure 2. The larger the absolute value of the Zeta potential, the more charges on the particle surface, indicating that the nano-SiO 2 The greater the charge, the stronger the electrostatic adsorption. According to Figure 2, comparing the Zeta potential values ​​at the same mass percentage concentration and different ethanol concentrations, it can be found that the potential is the most negative when the ethanol concentration is 30%, and i...

Embodiment 2

[0050] 1) The mass percentage concentration that is configured in the ethanol solution of volume concentration 30% is 1.5% SiO 2 Nanoparticle solution, method is the same as embodiment 1;

[0051] 2) PAH polyallylamine hydrochloride solution: at a room temperature of about 25°C, add 200mg of polyallylamine hydrochloride to 100mL of purified water, stir at room temperature to fully mix and dissolve;

[0052] 3) EPS extracellular polymer solution: add 20-40mg of Pseudomonas extracellular polymer powder in 100mL of purified water at room temperature around 25°C, stir at room temperature to fully mix and dissolve;

[0053] Table 1 shows the zeta potential and solute average particle size test results of EPS solution concentrations of 200 and 400 mg / L. Under different concentration conditions, the corrosion mass loss on the second day and the fifth day is as follows: image 3 shown.

[0054] 4) The paint coating method adopts the LbL layer-by-layer self-assembly method, and the ...

Embodiment 3

[0072] 1) The mass percentage concentration that is configured in the ethanol solution of volume concentration 30% is 1.5% SiO 2 Nanoparticle solution, method is the same as embodiment 1;

[0073] 2) PAH polyallylamine hydrochloride solution: at a room temperature of about 25°C, add 200mg of polyallylamine hydrochloride to 100mL of purified water, stir at room temperature to fully mix and dissolve;

[0074] 3) EPS extracellular polymer solution: the EPS solution concentration is 400 mg / L, and the preparation method is the same as in Example 2.

[0075] 4) The paint coating method adopts the LbL layer-by-layer self-assembly method, and the positive and negative electrolyte solutions are alternately dipped. Dip-coat each layer for 15, 35, and 45 minutes at 4°C, and the dip-coating sequence is as follows: SiO 2 Nano solution / PAH solution / EPS solution / PAH solution / EPS solution / PAH solution / SiO 2 Nano solution, freeze-dried at -50±5°C for 12h (the pre-cooling temperature of the ...

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Abstract

The invention provides a composite coating with metal corrosion resistance. The composite coating comprises a hydrophilic nanometer SiO2 layer, a poly-allyamine hydrochloride layer and a pseudomonas extracellular polymeric substance layer, which are upward arranged from a metal substrate, wherein the grain size scope of the nanometer particle forming the hydrophilic nanometer SiO2 layer is 100-700nm. According to the invention, a multi-polymer (microorganism extracellular polymeric substance) with self-healing function is introduced into a coating, so that new functions, such as coping with the outside stimulation or damage, recovering the protection effect of the coating and prolonging the service life, are provided and almost no side effect exists.

Description

technical field [0001] The invention belongs to the technical field of metal anti-corrosion, and in particular relates to a layer-by-layer self-assembled anti-corrosion coating and a preparation method thereof. Background technique [0002] According to the latest report released by the World Corrosion Organization, the annual direct economic losses caused by corrosion in industrialized countries account for about 3.1% to 3.5% of GDP. Corrosion not only damages technical systems and metal components in infrastructure, affects their normal operation, and endangers the environment, but also often results in a lot of human and financial resources for repairing and replacing damaged facilities. Therefore, anti-corrosion research has been paid more and more attention by countries all over the world, including my country. At present, the focus of research on corrosion in the world is metal materials, among which the corrosion of steel is the most important. [0003] Currently, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/08C09D1/00C09D139/00C09D201/00
CPCC09D1/00C09D5/08C09D139/00C09D201/00
Inventor 许萍翟羽佳汪长征张雅君孙丽华王俊岭
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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