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Preparation method of high-anticorrosion self-cleaning super-hydrophobic phosphating composite film on surface of zinc coating

A composite film layer and self-cleaning technology, which is applied in the coating process of metal materials, etc., can solve the problems of high equipment requirements, toxic raw materials, complex process engineering, etc., and achieve improved comprehensive performance, improved corrosion resistance, and simple process Effect

Inactive Publication Date: 2018-04-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The application number is CN 104846376 A, which discloses a method for preparing a metal-based superhydrophobic surface. The modifier of this method is a fluorine-containing compound, and the raw material is toxic and expensive, which is not conducive to large-scale industrial production.
The publication number is CN 20130079939.7, which discloses a method combining laser and chemical etching to prepare a superhydrophobic surface on an aluminum substrate, but the method is complex in process and requires high equipment, which is not conducive to industrial production
[0005] But so far, the structure of superhydrophobic surfaces faces a series of practical problems, such as poor microscopic shape stability, complex process engineering, and toxic raw materials, which are not conducive to industrial production.

Method used

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  • Preparation method of high-anticorrosion self-cleaning super-hydrophobic phosphating composite film on surface of zinc coating
  • Preparation method of high-anticorrosion self-cleaning super-hydrophobic phosphating composite film on surface of zinc coating
  • Preparation method of high-anticorrosion self-cleaning super-hydrophobic phosphating composite film on surface of zinc coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Take ZnO 1.2 g, NaNO 3 15 g and 85 wt% H 3 PO 4 11 ml was added to 1 L of water, and the pH was adjusted to 3.0 with NaOH to obtain a phosphating solution; Ce(NO 3 ) 3 2g and H 2 o 2 20 ml was prepared into 1 L of aqueous solution to obtain a rough modified solution;

[0045] (2) Soak the zinc plate in the phosphating solution at 45 °C in a constant temperature water bath for 5 minutes, and then soak it in the rough modification solution for 2 minutes at room temperature to obtain a zinc plate with a phosphate film layer. The phosphate film layer is Composite rough structure phosphating film with nanostructure and microstructure, the thickness of phosphate film layer is 15μm;

[0046] (3) Immerse the zinc plate with zinc phosphate film in the ethanol solution of 100 ml / L hexamethyldisilazane to modify for 30 minutes, and obtain a highly corrosion-resistant self-cleaning superhydrophobic phosphating with a thickness of 20 μm on the surface of the zinc plate...

Embodiment 2

[0052] (1) Take ZnO 1.2 g, NaNO 3 15 g and 85 wt% H 3 PO 4 11 ml was added to 1 L of water, and the pH was adjusted to 3.0 with NaOH to obtain a phosphating solution; Ce(NO 3 ) 3 2g and H 2 o 2 20 ml was prepared into 1 L of aqueous solution to obtain a rough modified solution;

[0053] (2) First put the zinc plate into the phosphating solution of 45 °C in a constant temperature water bath and soak for 5 minutes, and then soak it in the rough modification solution for 30 seconds at room temperature to obtain a zinc plate with a phosphate film layer. Composite rough structure phosphating film with nanostructure and microstructure, the thickness of phosphate film layer is 25μm;

[0054] (2) The zinc plate with phosphate film layer was immersed in 100 ml / L hexamethyldisilazane ethanol solution for 30 min to obtain a highly corrosion-resistant self-cleaning superhydrophobic phosphating composite film layer with a thickness of 30 μm.

[0055] The hydrophobic angle of the...

Embodiment 3

[0058] (1) Take 2.0 g of ZnO, NaNO 3 15 g and 85 wt% H 3 PO 4 Add 15 ml to 1 L of water, adjust the pH to 3.0 with NaOH to obtain a phosphating solution; take Ce(NO 3 ) 3 5 g and H 2 o 2 20 ml was prepared into 1 L of aqueous solution to obtain a rough modified solution;

[0059] (2) First put the zinc plate into the phosphating solution of 45 °C in a constant temperature water bath and soak for 5 minutes, and then soak it in the rough modification solution for 2 minutes at room temperature to obtain a zinc plate with a phosphate film layer. Composite rough structure phosphating film with nanostructure and microstructure, the thickness of the phosphate film layer is 20μm;

[0060] (3) Immerse the zinc plate with the zinc phosphate film in the ethanol solution of 100 ml / L hexamethyldisilazane for 30 minutes to obtain a highly corrosion-resistant self-cleaning superhydrophobic phosphating composite film with a thickness of about 25 μm .

[0061] The prepared high-cor...

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Abstract

The invention discloses a preparation method of a high-anticorrosion self-cleaning super-hydrophobic phosphating composite film on the surface of a zinc coating. Through the preparation method, a filmis formed on the surface of the zinc coating through phosphate and is constructed with the roughness, and the nanometer / micrometer phosphating film with the anticorrosion performance and of the roughstructure is formed; and then, the nanometer / micrometer phosphating film is subjected to hydrophobic modification through an environment-friendly low-surface-energy modifying agent, and the high-anticorrosion self-cleaning super-hydrophobic phosphating composite film is prepared on the surface of the zinc coating. The preparation method is simple in technological process and low in material costand equipment requirement; the process is free of toxicity and friendly to environment. The preparation method is beneficial to achievement of large-scale industrial production, is adopted to replacethe traditional high-toxicity and cancer-causing chromating process and has better comprehensive use performance.

Description

technical field [0001] The invention relates to the field of preparation of corrosion-resistant superhydrophobic materials, in particular to a method for preparing a highly corrosion-resistant self-cleaning superhydrophobic phosphating composite film layer on the surface of a zinc layer. Background technique [0002] As an important industrial raw material, zinc plays a very important role in all aspects of social production and life, and is widely used in construction, automobile, aviation, electronic equipment and other fields. However, its nature is lively, and it is prone to corrosion in wet conditions (usually its corrosion product is called white rust), which will affect its performance in severe cases and cause huge economic losses. [0003] Chromate passivation and phosphating are the two main post-treatments of steel after galvanizing. Chromate passivation can improve the corrosion resistance of the product and prevent the product from producing white rust during s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/13C23C22/42C23F1/30C23C22/02
CPCC23C22/13C23C22/02C23C22/42C23C2222/20C23F1/30
Inventor 孔纲李晓聪赖德林车淳山万先兰朱炎彬
Owner SOUTH CHINA UNIV OF TECH
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