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Preparation method of super-hydrophobic film on surface of steel substrate

A steel substrate, super-hydrophobic technology, applied in coating, metal material coating process and other directions, can solve the problems of low wear resistance, environmental pollution, complex process, etc., to achieve good wear resistance and corrosion resistance, The effect of accelerating etching speed and simple preparation process

Active Publication Date: 2019-10-22
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses an acidic ferric chloride solution, which not only pollutes the environment, but also has a slow erosion rate of ferric chloride, resulting in too long etching time, which also restricts the promotion of this scheme.
[0006] In addition, methods for preparing superhydrophobic surfaces of metal substrates include sol-gel, electrochemical methods, template methods, and chemical deposition methods, etc., but most hydrophobic coatings have poor adsorption capacity to the substrate, and their wear resistance is not high. , these schemes have disadvantages such as complex process, high cost, long cycle and poor practicability, and are not conducive to wide application in industry.

Method used

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  • Preparation method of super-hydrophobic film on surface of steel substrate
  • Preparation method of super-hydrophobic film on surface of steel substrate
  • Preparation method of super-hydrophobic film on surface of steel substrate

Examples

Experimental program
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Effect test

Embodiment example 1

[0027] (1) Experimental operation process:

[0028] 1. Surface pre-treatment: First, put the 316L steel substrate sample in absolute ethanol and deionized water for 10 minutes, and then use 600 # , 800 # , 1200 # , 1600 # Sandpaper until the surface is smooth.

[0029] 2. Etching: Dissolve ferric fluoride in deionized water to obtain a 10%wt electrolyte solution, and then place the sample in an anodic oxidation system. The 316L steel substrate is used as the anode, and the platinum electrode is used as the cathode. 10mA / cm 2 After 20 minutes, the sample was taken out and rinsed with a large amount of deionized water until there were no air bubbles on the surface of the substrate.

[0030] 3. Modification: Prepare 0.01mmol / L stearic acid and 0.01mmol / L perfluorooctyltrimethoxysilane ethanol solution, place the above-mentioned etched steel substrate in the solution for modification for 1 hour, and then take it out.

[0031] 4. Heat treatment: Place the sample in a crucible...

Embodiment example 2

[0035] (2) Experimental operation process:

[0036] 1. Pre-treatment: First, put the 316L steel matrix sample in absolute ethanol and deionized water for 10 minutes, and then use 600 # , 800 # , 1200 # , 1600 # Sandpaper until the surface is smooth.

[0037] 2. Etching: Dissolve ferric fluoride in deionized water to obtain a 15%wt electrolyte solution, and then place the sample in an anodic oxidation system. The 316L steel substrate is used as the anode, and the platinum electrode is used as the cathode. 20mA / cm 2 After 15 minutes, the sample was taken out and rinsed with a large amount of deionized water until there were no air bubbles on the surface of the substrate.

[0038] 3. Modification: Prepare 0.02mmol / L stearic acid and 0.02mmol / L perfluorooctyltrimethoxysilane ethanol solution, place the etched steel substrate in the solution for modification for 1.5h, and then take it out.

[0039] 4. Heat treatment: Place the sample in a crucible and dry it in an oven at 100...

Embodiment example 3

[0043] 1. Pre-treatment: First, put the 316L steel matrix sample in absolute ethanol and deionized water for 10 minutes, and then use 600 # , 800 # , 1200 # , 1600 # Sandpaper until the surface is smooth.

[0044] 2. Etching: Dissolve ferric fluoride in deionized water to obtain a 20%wt electrolyte solution, and then place the sample in an anodic oxidation system. The 316L steel substrate is used as the anode, and the platinum electrode is used as the cathode. 30mA / cm 2 Carry out anodic oxidation under the same conditions, take out the sample after 10 minutes, and rinse with a large amount of deionized water until there are no air bubbles on the surface of the substrate.

[0045] 3. Modification: Prepare 0.05mmol / L stearic acid and 0.05mmol / L perfluorooctyltrimethoxysilane ethanol solution, put the above etched steel substrate in the solution for modification for 2.0h, and then take it out.

[0046] 4. Heat treatment: Place the sample in a crucible and dry it in an oven at ...

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Abstract

The invention discloses a preparation method of a super-hydrophobic film on the surface of a steel substrate. The method includes the steps that the steel substrate is ground and subjected to deoilingpretreatment, and oil and oxides on the surface of the steel substrate are removed until the surface is smooth; the completely-treated steel substrate is soaked in a iron fluoride solution, and a rough steel substrate surface is obtained through the combination of chemical etching and electrochemical etching; and the etched steel substrate is soaked in an ethanol solution of stearic acid and perfluorooctyl trimethoxysilane to be modified for a period of time, after the steel substrate is dried at constant temperature, a modified super-hydrophobic nanosilicon dioxide solution is sprayed to thesurface of the steel substrate, and after heat treatment is completed, the super-hydrophobic composite film is obtained. The process is simple, environmentally friendly, safe and reliable, and a hydrophobic coating is high in hydrophobicity, further has the beneficial effects of being high in adsorptivity, good in abrasion resistance, high in corrosion resistance and the like, and is suitable forlarge-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of metal surface treatment, in particular to a method for preparing a super-hydrophobic film on the surface of a steel substrate. Background technique [0002] Steel is widely used in military industry and civilian industry, but its surface is easily corroded, which restricts the application and promotion of steel products. Therefore, it is very necessary to improve the corrosion resistance of the steel substrate surface. [0003] As one of the new functional materials, superhydrophobic material refers to the surface with water contact angle greater than 150° and rolling angle less than 10° on the surface of the material. It exists widely in nature, such as lotus leaves, taro leaves, butterfly wings, rice leaves, etc. Due to its unique properties such as self-cleaning, anti-icing, corrosion resistance and drag reduction, super-hydrophobic coatings have always been a hot topic of research by researchers. ...

Claims

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Application Information

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IPC IPC(8): C23C26/00C23F1/14C25F3/06
CPCC23C26/00C23F1/14C25F3/06
Inventor 黎学明曾韬杨文静王雅丽满帅帅徐鹏谢玉婷
Owner CHONGQING UNIV
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