Method for preparing low-adhesion super-hydrophobic surface on steel substrate

Abstract

The invention discloses a method for preparing a low-adhesion super-hydrophobic surface on a steel substrate. The method is characterized by comprising the following steps of: polishing and grinding a steel plate; cleaning and deoiling and then soaking in copper sulfate aqueous solution for not less than 20 seconds to uniformly deposit a copper layer on the surface; soaking the steel plate deposited with copper in fluorosilane-containing silver nitrate aqueous solution for not less than 2 minutes to uniformly deposit a fluorosilane-containing silver layer; taking out and washing with water; and drying to obtain the low-adhesion super-hydrophobic surface. The steel surface obtained by using the method has extremely high hydrophobicity and adhesion resistance, and the contact angle for water drops on the steel surface is 163.4 degrees and the rolling angle is only 1.5 degrees. According to the method, no dangerous chemical reagent or complex expensive equipment is required, the process is simple, and the repeatability is good.

Description

technical field [0001] The invention relates to a method for preparing a low-adhesion superhydrophobic surface on a steel substrate, and belongs to the fields of functional materials, metal surface modification and protection. Background technique [0002] A low-adhesion superhydrophobic surface refers to a surface on which a water droplet has a contact angle greater than 150° and a rolling angle less than 10°. Because of its self-cleaning, drag reduction, corrosion resistance, anti-icing and frosting and other characteristics, it has extremely broad application prospects in the fields of military, communication, aviation, energy and biomedicine. The lotus leaf is a typical representative of low-adhesion superhydrophobic surfaces in nature. Although the superhydrophobic self-cleaning phenomenon of lotus leaves was documented more than a thousand years ago, its mechanism has not been elucidated until recent years. Barthlott and Jiang's research found that the low-adhesion s...

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Problems solved by technology

However, the above methods have certain deficiencies: (1) the chemical etching method needs to use strong acid and strong alkali, which is harmful to the operator and the environment; (2) the processing time required by the chemical deposition method is long, about 30h; (3) The laser etching method requires expensive equipment, and is limited by the space of the equipment, so it cannot be prepared in a large area; (4) the sol-gel method needs to prepare SiO2 in advance. 2 Silica gel solution, the preparation of the silica gel solution takes a long time, it takes 19h; (5) The spraying method needs to be cured at 300°C for 2h, not only the processing time is longer, but also it is impossible to prepare large-area low-adhesion ultra- hydrophobic surface

In addition, the above-mentioned chemical etching method, chemical deposition method, and laser etching method all divide the preparation of the rough structure and the reduction of the surface energy into two steps, which greatly reduces the processing efficiency.

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