A kind of ni-ptfe-sic superhydrophobic anticorrosion coating and preparation method thereof

An anti-corrosion coating, ni-ptfe-sic technology, applied in coatings, electrolytic coatings, etc., can solve the problems of unexplained anti-corrosion effect of super-hydrophobic surface, changes in surface structure and chemical properties, hindering the process of industrial application, etc. Achieve high hardness, improve hydrophobicity, and increase the effect of compounding

Active Publication Date: 2022-05-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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Problems solved by technology

[0003] However, due to the generally poor stability of various superhydrophobic coatings prepared at present, the process of its industrial application has been hindered.
The main reason for the poor stability of superhydrophobic coatings is that various preparation processes currently rely on the use of low surface energy substances to modify the surface of the coating to obtain superhydrophobicity. These substances are easy to fall off during use; at the same time, Under the influence of corrosive media, the superhydrophobic surface will change its surface structure and chemical properties, reducing its hydrophobicity.
Chinese invention patent CN 112030213 A discloses a superhydrophobic nickel-tungsten / tungsten carbide composite coating, in which low surface energy substances must be used to modify the coating twice to make the surface superhydrophobic, and the anticorrosion effect of the superhydrophobic surface is not high. see description

Method used

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  • A kind of ni-ptfe-sic superhydrophobic anticorrosion coating and preparation method thereof
  • A kind of ni-ptfe-sic superhydrophobic anticorrosion coating and preparation method thereof
  • A kind of ni-ptfe-sic superhydrophobic anticorrosion coating and preparation method thereof

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preparation example Construction

[0032] The invention provides a kind of preparation method of Ni-PTFE-SiC superhydrophobic anticorrosion coating, comprises the following steps:

[0033] Mixing polytetrafluoroethylene nanoparticles, SiC nanoparticles and a nickel-based plating solution to obtain a Ni-PTFE-SiC mixed solution;

[0034] The metal substrate is used as the cathode, the nickel plate is used as the anode, and the Ni-PTFE-SiC mixed solution is used as the plating solution for electrodeposition, and a Ni-PTFE-SiC superhydrophobic anti-corrosion coating is obtained on the surface of the metal substrate.

[0035] The invention mixes polytetrafluoroethylene nanoparticles, SiC nanoparticles and nickel-based plating solution to obtain Ni-PTFE-SiC mixed solution. In the present invention, the average particle size of the polytetrafluoroethylene nanoparticles is preferably 0.7-0.9 μm; the average particle size of the SiC nanoparticles is preferably 0.5-0.7 μm; the solute of the nickel-based plating solution ...

Embodiment 1

[0051] Molecular dynamics was used to simulate the wetting behavior of water droplets on the surfaces of Ni, PTFE, and SiC to analyze whether the two kinds of nanoparticles embedded in the nickel base were conducive to the improvement of the hydrophobicity of the coating. The specific results are as follows image 3 as shown, image 3 is the wetting process of water droplets on the surface of different materials, where (a1)~(a5) are the wetting process of water droplets on Ni surface, (b1)~(b5) are the wetting process of water droplets on SiC surface, (c1)~ (c5) is the wetting process of water droplets on the surface of PTFE.

[0052] image 3 The results show that: the water molecules on the surface of Ni spread rapidly downwards, and finally form a layer of water film on the surface of the substrate, and the smooth nickel substrate has strong hydrophilicity; when the water droplet is on the surface of SiC, the spreading speed of water molecules is relatively slow. slow, an...

Embodiment 2

[0054] In the electrodeposition process, in order to improve the dispersion of nanoparticles and avoid agglomeration of nanoparticles, a sufficient concentration of surfactant is usually added to improve their dispersion. Compared with PTFE nanoparticles, SiC nanoparticles have a large density. Agglomeration will have an extremely adverse effect on co-deposition. However, the surfactants selected by different preparation processes are different. In order to determine which surfactant has a better dispersion effect on the electrodeposition system of the present invention, molecular dynamics was used to simulate different types of surfactants (hexadecyltrimethyl Ammonium bromide, sodium lauryl sulfate, perfluorooctyl quaternary ammonium iodide) on the dispersion effect of SiC nanoparticles, the results are as follows Figure 4 as shown, Figure 4 is the dispersion of SiC nanoparticles by different surfactants, where (a) is sodium dodecyl sulfate (SDS), (b) is cetyltrimethylammo...

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Abstract

The invention relates to the technical field of super-hydrophobic coatings, and provides a Ni-PTFE-SiC super-hydrophobic anti-corrosion coating and a preparation method thereof. The invention adds PTFE and SiC nanoparticles into the nickel-based plating solution, utilizes the low surface energy and low friction coefficient of PTFE and the high hardness and high wear resistance of SiC, and prepares Ni-PTFE-SiC on the metal substrate by electrodeposition Super-hydrophobic anti-corrosion coating, no need to use low surface energy substances for secondary modification of the coating. The super-hydrophobic anti-corrosion coating has a micro-nano dual-scale structure, including a nickel metal layer and PTFE and SiC nanoparticles embedded in the nickel metal layer. Nickel crystals are adsorbed on the nanoparticles, and a large number of micro-pores can be formed between the micro-nano dual-scale structure. Trapping air makes the coating achieve good hydrophobicity. After testing, the Ni-PTFE-SiC super-hydrophobic anti-corrosion coating has a good anti-corrosion effect on the substrate, and has excellent mechanical stability and durability.

Description

technical field [0001] The invention relates to the technical field of superhydrophobic coating treatment, in particular to a Ni-PTFE-SiC superhydrophobic anticorrosion coating and a preparation method thereof. Background technique [0002] In recent years, superhydrophobic coatings have shown great industrial potential in the fields of self-cleaning, oil-water separation, anti-corrosion, anti-icing and anti-fog, and drag reduction, especially in anti-corrosion. Corrosion of metals around the world has caused serious waste of resources, economic losses and potential safety hazards, and the preparation of superhydrophobic coatings on the surface of metal substrates can effectively isolate the contact between metals and corrosive media, thereby greatly reducing the corrosion rate. [0003] However, due to the generally poor stability of various superhydrophobic coatings prepared so far, the process of its industrial application has been hindered. The main reason for the poor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D15/00C25D3/56
CPCC25D15/00C25D3/562
Inventor 刘建国崔淦房秀婷邢潇李自力
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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