Preparation method of superhydrophobic galvanizing coating on steel surface

Abstract

The invention discloses a preparation method of a superhydrophobic galvanizing coating on a steel surface and belongs to the field of electrodeposition. The method is as below: first putting steel matrix into a zinc sulfate aqueous solution without leveler or brightener and conducting a two-step electrodeposition treatment: first, carrying out electrodeposition on steel matrix surface to obtain a rough structure with large size; and second, carrying out electrodeposition on the microstructure with large size to obtain a fine structure with small size, thus forming a micro-nano rough structure; and then conducting fluorination treatment on the steel sample containing galvanizing coating with micro-nano rough structure to reduce the surface energy, and obtain a superhydrophobic functional surface. The contact angle of distilled water with the functional surface exceeds 150 DEG, and a roll angle is less than 10 DEG, thereby reaching superhydrophobicity. The superhydrophobic galvanizing coating surface not only has corrosion resistance of a traditional galvanizing coating, but also has self-cleaning properties, thereby opening up a novel field of application for electrodeposition process. The method has the advantages of easy operation, low cost, no restriction in matrix shape and easiness to popularization and usage.

Description

technical field [0001] The invention relates to a method for preparing a super-hydrophobic galvanized layer on the surface of steel, in particular to two-step electrodeposition treatment and low-energy modification on the surface of a steel substrate, thereby realizing super-hydrophobicity on the surface of the steel. Background technique [0002] Since the mystery of the "lotus leaf effect" was discovered by some researchers, superhydrophobicity has attracted great interest and widespread attention, and superhydrophobic surfaces play an important role in daily life and industrial and agricultural production, such as: permanent tableware, textiles, boats, solar panels, and more. For this reason, more and more people began to explore various methods to prepare superhydrophobic surfaces, and found that there are mainly two methods for preparing superhydrophobic surfaces: one is to improve the surface roughness of hydrophobic materials, and the other is to Low-energy modificat...

AI Technical Summary

Problems solved by technology

However, the substrates involved in most methods are cotton fibers, glass, silicon wafers, magnesium and magnesium alloys, aluminum and aluminum alloys, etc., and the preparation of superhydrophobic surfaces on steel substrates is relatively rare.

In addition, many preparation methods, such as directional etching, vapor / liquid phase deposition, template technology, sol-gel, etc., have problems such as harsh preparation conditions and high cost, which limit the promotion and large-scale application of these methods

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